WORLD METEOROLOGICAL ORGANIZATION

INSTRUMENTS AND OBSERVING METHODS

REPORT No. 45

I WMOTDNo310 I 1989 W0 R L D MET E 0 R 0 LOG I CAL 0 R G A NIZ A T ION

INSTRUMENTS AND OBSERVING METHODS

REPORT No. 45

ANALYSIS OF INSTRUMENT CALIBRATION METHODS

USED BY MEMBERS

by

H. DOERING

1989 @ 1989, World Meteorological Organization

NOTE

The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of the Secretariat o[ thc World Meteorological Organization concerning the legal stalus o[ any country, territory, city or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries.

EdilorilJl not~: This report has [or lhc grcater part been produced without cditorial rc',ision by the WMO Sccrelarial. It is not an official publication and its distribution in this form does not imply endorsement by the Organization of the ideas expressed. INTRODUCTION

The ninth session of CIMO in 1985 decided to survey and analyze calibration techniques and methods used in different countries. The analysis should serve as a first step for promoting the standardization of calibration methods of Members. CIMO-IX allocated this task to the Working Group on Surface Measurements. A Questionnaire on the Calibration of Meteorological Surface Instruments was prepared in 1987 for the variables: temperature, humidity, pressure, wind speed and direction. The Questionnaire was distributed by WMO and replies were received from 76 Members of which 52 calibrate their meteorological instruments, 24 do no calibration, 17 intend to establish calibration facilities and 12 wish to send instruments for calibration to a suitable center in their region.

The preliminary analysis showed that there are significant differences in the ranges of calibration, the number of calibration points used and the calibration accurancy. Other differences in calibration methodology amongst Members are for example:

For field tests with a reference instrument. a large number of measurements are carried out under ambient conditions over a period of 2 to 4 days. The reference instrument used was usually a relatively new example of the same type calibrated by its supplier, but often with unknown accuracy. For field test with a travelling standard the same procedure is used in conjunction with a calibrated travelling instrument. Members which have laboratory calibration facilities at their disposal often use such field tests as an additional calibration method. Field instruments are checked at a few points only. For calibrations performed in the laboratory the atmospheric conditions are usually simulated over a range which does not necessarily fully cover the total measuring range of the instrument under test.

In order to improve instrument performance worldwide, it is recommended that those Members which do not have calibration facilities should introduce travelling standards. Suitable travelling standards for comparison checks are:

.precision for and thermographs; .precision psychrometer (e.g. Assmann type) for ; .precision for and barographs; -hand-held for and ~compass for wind vanes.

All these instruments should be stored in. rugged cases suitable for transportation by air and under poor road conditions.

The establishment of instrument centers as proposed in Rec. 19 (elMO-IX) especially in those areas where many Members at present either do not or are unable to calibrate their instruments would make a significant improvement of meteorological instruments.

The Working Group expresses the gratitude to its mernber r Mr. H. Doering, Federal Republic of Germany, for the valuable work he has done in compiling the analysis and preparing this publication. TYPE OF IHSIRUiERI: !L.ECIRlCAL IHERIIOIEIERS caUlmy IAIfUFACIURER/1I0DEL. PRINCIPLE OF IEJ,SUREIEII LIllIS OF CALIBRAnOK RAISE OF KUIBER OF TYPE OF 'ORKIR6 SIUDARD OPERAnOI RAII6E ERROR IIIIERYAL CALIBRATION CAL.POHITS

Australia Rosemount Platinum -20 ..+55'C .t 0.3 K Field checks annually -10 ... +50·C 7 l.eed & Northrup, Platinum, 1974

Austria NTC, Pt 100 -30 ...+40'C .t·0.1 I 1 year -30 .. , +40'C 15 Bossecker, Hg", Ti-thermometer, 1942

France Pt 100 Kot regularly -20 ... +50·C • Platinum 25, Datron Dill!

German Demoer. VEB Thermometerwerk Geraberg Pt 100 -30 ...+40'C .t 0.2 K liot regularly -15 ...+40'( 3 Precision Hg-Thermometer and/or Renublie pt 100

Germany, Degussa, Heraeus Pt 100, DIIi 43760 -30 ...+50'C several years -30 ...+35"C typ 3 Thermo-Schneider Fed.Rep. of Pt 100, DIN 43760 -40 .. +4O'C typ .t 0.1 K Knt regularly cal ibr. -30 ...,t30·C typ 3 Heraeus Platinum Thermometer PH:Z 100-1, 1987

Japan llakaasa Instruments Platinum -40 ...+40'C .t 0.5 K 5 years O..+30·C 2 Glass thermometer, Yoshino Keiko (0 Ind. F-732 and others lIod.S-501

Netherlands Degussa, for soi 1 Temperature Pt 500 -30 ...+40'( ..!. 0.1 K 2 years o..+30·C Sensing Devices Ltd., lIod. , for Psychrometer Pt SOD -30 ...+40·C .t 0.1 K 2 years -20 ..+40'C 13• pt 100 S 351-100, 1987 ...

New Zealand Yellow Springs Instrument Co. Thermistor -30 .. +lOO·C .t 0.15 K 2 years in lab . -5 ..+40'C 3 Sensor: Platinum, Leeds & Korthrup Mod.i'01 and 703X 1 year in field Readout 1nstr.: Datron Mod. 10£lA, 19B7 Phi lips Pt 100 -£0 ... +40'C DIN 43760,K1.B 2 years in lab. 0, .+40'( I year in field

Republic of Ishikawa, lIod. lEH-8£p Platinum -50 ...+50'C :. 1.0 K 5 years -50 ..+50'( 21 Korea

Snain Thies Pt 100 -30 ... +50·C :. 0.3 K a years -15 ..+35"C 3 fluke 2180. Pt 100, 1987 Schneider Hg. 1987

Sweden Heraeus Pt 100 -50 ...+50'C .t 0.2 K 1-2 years -50 ..+50'( 8 Heraeus Pt 10-0, 1974-198£ Hewlett-Packard DVI

Switzerland Meteolabor AG Yearly field tests -80 ... +50'C step of 1 K Thermometry System, 1985 Vent i lated Thermometer YlIT-l Linear. thermistor -30 ...+50'C ,t 0.25 K Initial calibration Rosemount lIod. IS 104 HL Ventilated Thermohygrometer Linear. thermocouple -50 ...+50'C .t 0.2 I pt sensor

United Kinll"dom Rosemount, lIod. l14a .!. 0.15 K initial calibration -10 ..+30·C 3 H. Tinsley & co Ltd .. lIod. 5187SA pt thermometer with ACbridl!e ASL lIod H7. 1980 TYPE OF IKSTROIEIlT: ELECTRICAL THERIOIETERS

COmHY IA.KlIfACTURERIIODEL ACCURA(Y OF COISTANCY Of (lUBRATIOI CALIBRATIOI COIPARISON lITH CERTIfICATES DESCRIPTIOIf OF THE CALIBRATIOII PROCESS 'DRIllS STAIDARD COIIDIIIOIiS ACCURACY NATIONAL SIAIDARD OF CALIBRAIIOif

Australia Rose.Gunt .±. 0.05 K .±. 0.01 K .±. 0.05 K Every 5 years No stirred tell(lerature bath

Austria .±. 0.1 K -30 ...+5'(: t 0.1 K !. 0.1 K Not regularly Y" Oil-bath or antifreezing agenth-bath +10 ...+WC::±: 0.05 K

France !. 0.05 K 1 !. ll.l K IHII: 6 months No Calibration in a bath Resistors: 2 years German DellOcr. VEB ThenOlleterwerk 6eraberg .t lLOI K .±. 0.01 K .±.U5 ..!.O.1 K Every 2 years '0 Calibration in an Precision cryostat- Republic temperature bath

Germany, Degussa, Heraeus .t 0.05 K .±. 0.02 K !. 0.2 K Every 10 years No Calibration in a bath Fed.Rep.of above O'C: t 0.01 K !. 0.03 K above 0·C:.:!:.0.05 K Every 5 years y" Calibration in a fluor inert bath belo.. 1I"e: :t 0.2 • below O'e:.:!:.0.25 K Computer aided measuring and calculation

Japan Nakaasa Instruments .±. 0.2 K .:!:. 0.2 R Every 2 years y"

Netherlands Degussa, for soil Temperature .±. 0.003 K I Degussa, for Psychrometer .±. 0.1102 K .±. 0.005 K Every 2 years y" Ethanol bath

'"I Hew Zealand Yellow Springs lnstrullent Co. .±. 0.04 K Sensor: Every 5 years Y" Oil filled calibration bath lod. 7111 and 703X .:!:. 0.09 K .±. 0.06 K Instrulll:Every 2 years (Friedr. lod. B221.1)

Philips 5 sets of readings

Republic of Ishikawa, lod. IEH-B6j) .:!:. 0.01 K Every year Y" Alcoholic bath Korea

Spain Thies .to.OlB K.:!:.0.15 [p.a below O'C: .:!:. 11.01 K .:!:. 0.015 K .±.O .01 K above O·C: .±. 0.003 K .±. 1!.015 K Every 3 month '0 Calibration in a bath

Sweden Heraeus .:!:. 0.02 K .±. 0.02 K .!. 0.04 K Y" No Calibration in a bath, Computer aided calculation and comparison

S,iherland leteolabor A6 .:!:. 0.01 K .±. I!. 002 K .±. 0.05 .K Every 3-4 years No Rosemount lIod. 'JIOAC Ventilated Therm.ometer VHT-l Variable Temp. oil Bath Venti lated Therlllohygrometer

Uni ted Kingdom Rosem.ount, Mod. M4a ,±,O.OOH! .!. 0.002 K .to.0035K Every 2 years Y" Measuring the resistance at stabilised tem.peratures TYPE OF IMSTRUIEKT: TRERIOIEIERS

COUNTRY ItANUFACTURER/J(ODEL PRINCIPLE OF MEASURElENT I.IMITS OF CALIBRATION RANGE OF NUMBER OF TYPE OF fORKING STANDARD liPERATION RANGE ERROR INTERVAL CALIBRATIOlf CAL. POINTS

Argentina Mercury, alcohol, ~7U ...+55'( 3 years -7U ... +55·C Every 5 K Fuess mercury thermometer, toluol, Mere-thallium -25 ...+55'(, 1955 lfegretti & Zambra toluol thermometer, -BU ...+I0U·C, 1950

Austria Hemetsberger ~inimum Ih Toluol -40 ...+30'( .:!:. 0.3 K Not regularly caL br . -35 ...+30'( 14 Bassecker, Hg- Ii-Thermometer, 1942 Hemetsberger Maximum Ih Mercury -15 ..+45'( .:!:. 0.2 K Not regularly cal br . -15 ... +45·C 12 lIellletsberger Ordinary th lertilry -35 ..+50'( .:!:. 0.1 K Not regularly cal br. -30 .. +40'C IS

Bangladesh Mod. 85T692 Ordinary th Mercury 0...+50'C .:!:. 0.1 K 1 year 0... +50·C 6 Ilercury therllometer, Zeal (Engl.) lod. BS-TaZ

Botswana Casella Ordinary th -10 ..+65"C 1 year -10 ... +65·C Every 5 K laximum th -10 ..+65'C -10 ... +65·C Every 5 K lIinimum th -15 ..+50'( -15 ..+50'( EVery 5 K

Bulgaria USSR, TN-I Ilaximum Ih -35 ..+50'C .:!:. 0.4 K 4 years -30 ... +40'C 10 GDR, 1970 USSR, T11.-2 lIinimuin Ih -41. .+41'( .:!:. 0.5 K 4 years -30 ... +40'C 10 USSR, TN- 3 -35 ..+60·C .:!:. 0.5 K 4 years -30 .. +50'C 10 USSR, 1IH Ordinary th -35 ..+4O"C .:!:. 0.2 ....:!:.0.3 K 4 years -30 .. +40'C 10 USSR, TH -10 ..+50'( .:!:.H K 1 year -10 ... +40·C B "- USSR, T1!-6 Psythrolll. th -30 +50'C .:!:. 0.Z ....:!:.0.3 K 4 years -30 ... +40·C 10 USSR, T11-7 Barometer th - 5..+45·C .:!:. 0.5 K 4 years - 5..+40·C 4 I1SSR, Til-? Vater Ih -ZO ...+30·C :t.0.L.:t.O.3K Z years -ZO ...+30"C 5

Chile Dr. Kiiller, 49ay6lK Mercury -30 ..+55'C .:!:. 0.1 ....:!:.0.2 K 2 years ~20 .. +55·C IS Dr. MUller, 2B/45p Mercury -35 ..+4S'C .:!:. 0.1.. ..:!:.0.2 K Z years -10 ... +40'C 11 Dr. lIuller, 43c/50 Maximum th lIercury -30 ..+50'C .:!:. O.Z K Z years - 5...+45·C 11 Dr. Kfiller, 43d140 Ilinimum th Alcohol -40 ... +40'C .:!:. 0.3 K 2 years -ZO ...+35·( 13 Dr. Iliiller, 53 c Hercury o ..+5O"c .:!:. 0.1...~O.2 K 2 years 0...+50'C 12

Friince Iiercury Not regularly calibrated -ZO ... +50'C , Mercury thermometer and pt (25 (l) sensor with Datron Dill

German Democr. TherlDometerwerk Ordinary th -30 ...+40·C !. 0.2 K 10 years ~30 .. +40'C a Precision mercury thermometer Republic Geraberg, GDR VEB Geratewerk Geraberg, DOR Maximum th -30 ..+50'C .:!:. 0.3 K 10 years -ZO ... +40·C linimum th -40 ...+40'C .:!:. 0.3 K 4 years -30 ... +30·C Sling thermo -35 ...+40·C .:!:. 0.3 K IU years -20 .. +30'C

Germany, l'hermoschneider linimum th Alcohol -40 .. +40'C ..:!:. 0.3 K Not regular,ly calibrated -30 ... +30·C , Jolters & Kohring, Mod, OT -5, Fed .Rep .of ltaximum th lIercury ~30 .. +50'C .:!:. 0.2 K ~30 .. +40'C a Digital Thermometer, Pt IUD sensor Ordinary th lercury -35 ...+·4O'C .!. 0.2 K -3D ..+30'C f

TYPE OF IHS!RUIEMI: THERIOIET~

COUNTRY IlANUF!(TURER/JODEL ACCURACY ,OF (OBSTA"C! OF CALIBRltIOI CA.LIBRmOI COMPARISON InH CERTIFICATES DESCRIPTION OF TIlE CALIBRATION PROCESS IORKING SUIDARD COtroItlONS ACCURACY NATIONAL STAllDA.RDS OF ClUBHATIDK

Argentina .!. 0.1 K Stable for 1 10 .in .!. 0.2 I Every 2; years los )-5·C: Bath of water, aicohllie and glycerine (-S·C: Therllal chamber

Austri.a Hellletsberger lIinimul! th .!. 0.1 K 10 ...4O"e .±. 0.05 K .±. 0.1 K Rot regularly For (l'D use Oil-bath or antifreezing agent-bath, Hemetsberger Ilaximull th -3G .. 5" :!:. G.I , only comparison with standard thermometer Hemetsberger Ordinary th

Bangladesh lad. BST£92 Ordinary th .!. 0.1 1 Perfect :!:. n.l K los los Destilled later bath

Botswana Casella Ordinary th .!. 0.2 I lIaxiulil th Ilinimum th

Bulgaria USSR, 11-1 Ilaximum til .!. 0,1 K Every 4 years los USSR, Tl!1.-2 linimum th USSR, lN~3 USSR, TM.-4 Ordinary til USSR, i1H USSR, TI-6 Psychrllm. th 1'-' USSR, TI-7 Barlllleter th , 1 USSR, TlH later th

Cllile Dr, IUller, 49ay61K .!. 0.01 K .!. 0.2 K N, N, Dr. Killer, 28f.45p Dr. lIUller, 43c/50 Maximum th Dr. lIfrller, 43df.40 lIinimulI th Dr. lliiller, 53 c

France .!. 0.05 K .!. 0.1 K Every 2 years N, Therllllstatic bath

German Deiller. Therl.llmeterverk Ordinary th .!. 0.05 K .!. 0,05 ...,: 0.1 I .!. 0.1 K Every 2 years los Tventy therlllll!eters in a bath, Republic Geraberg, GDR one read after the other laximull th Ilinimum th Sling thermo

Germany, Therlloschneider Ordinary th .!. 0.03 K .!. 0.03 I .!. 11.1 I Every 5 years los Stirred temperature controlled alcohol bath Fed.Rep.of Maximum til linilllul th Sling thermo - 8 -

u o

.... -<"0 om·...... ·u ....""' ...., ...... ---~.,;~.,,; --­.,,;,;..; ., "'~l.,; :. ... -1 ...·1 ...·1 ... .1 ...-1 ... 1 ,: c::: '~a::: --- .. uu _0 e-> ...,. ...,. ~I~ ~I$;l N~ ...... <.:.> •. ,-0 -- ...i ~~~ § ...~ --.,;.,; --­,0";."; o -­"';,"'; ~'!I! ... 1·...1 ... 1· ...·1 ....·1 +-1+1 ., g'''''''''- .... +·1 il'i,i. ., ·... 1 ... ·1

u ~ u u ..., ...... U U U UU U U U U U U ~.~ ~ :r '~ ~ .. :r ~ --. . ~ . ~ ~ .'~ 0 '" , ...... , ..-. <$.-~ ~ ..~ ~:~ " ~ -~,, ::r , I, ., I '"

B ~ :. ~ ~ ~. !'J iO t'g: - iO iO ~- '~ i: i: :to '.~ ~ E~ ,E ~~ =-,,,,- ~ i " ·".....0 .!i" .!i ,it -;::;; .:" - :;; .!i"::" ,it ::;:;;;;" .. .~ .. .. ~ ~ ~ :::-::; ~ ~ ~ ~ ~ II ~ •• = t'ttl .",• '.'" ~ i :~ ~ 1 0 - .. ri '" 0'; .'~ ;;~ ~ il j 0 " - ~ ,:; -,= .~ .5;:;:1:. -'" 8 f ] ~ "' I .~ '" ~ ] j ~ . i g ~ ~ . !lil B ~ . " ~ ::!:: ~ ~ i I ~ ~ 0 -;; j ] l~ ~ ] - 8 to '" to ] Iii '" " - ! !" 0 :. . ~ ! [ ~ ~ ~ ,.1 j :l! - ~ ! ,ti ~ f ;il - '" '" TYPE OF I1fSTRDIENT: THERMOIETERS

COUNTRY IANUFACTlffiER/tlODEL ACCURACY OF COMSTAMCY OF CALIBRlTIOI CALIBRATIOI COIPARISOIf lITH CERTIFICATES DESCRIPTION OF THE CALIBRATION PROCESS lORUNG STANDARD COIIDIIIOIfS ACCURACY IfATIOIfAL STAIDlRDS OF CAl.IBRATIOIf

Germany, Thermoschneider Soil thermol. Fed.Rep.of l 20 em Soil thermom. 50 em, HiO CD

Hong Kong Casella ~0.02K ~ 0.1 K ~ 0.1 It: No No Thermostatic tater bath Jetbulb th ~ 0.02 It: .!. 11.1 I: ~ 0.1 K No N.

Hungary ,DR Ordinary th ~ 0.05 K .!.O.02 ....!.0.05 K .!. 0.1 K. Every 2 years Yes Lallbrecht alcohnl bath

India India made !. (1.05 K ~ 0.1 K N. Yes later bath

Japan Yoshino Kerki Co. .!. 0.2 K .!. 0.2 K Every 2 years Yes

Jordan Lambrecht No Yes Thermostatic bath '"

Maroc STIL (France) Psychrol!. th !. 11.02 K !. 0.1 I !. 0.05 K Yes Thermostatic bath

STIL (France) laximulthermol..

5TIL (France} Ninimumthermom. .!. 0.02 K .!. ILl I !. 0.05 K Yes Thermostatic bath

Nigeria Case Ila B.S.692 later bath Lambrecht

Norway Fuess Several ~O.03K .!. 0.05 I ~ 0.7 K Yes Thermostatic alcohol bath

Pakistan Zeal Ordinary th !. 0.0 K !. 0.2 K Jithin 2 years later bath

Casella laxiIUm th .!. 0.2 K Short & lason Minimum th !. 0.3 K TYPE OF IIlSTRUIEIlT: THERIO~ETERS

COUNTRY IANUI'ACTUREH/IIOOEL PRINCIPLE 01' IEASUREIIENT LIIlTS OF CALIBRATION RANGE OF NUIBER OF TYPE OF YORKING STANDARD OPERATlOM RAKGE ERROR INtERVAl. CALIllRAIION CAL. POINiS

Philippines Veksler, USA laximum th Mercury -30 ... +55·C 2 years +10 ... +45·C , SchEff Thermolleter, Mercury, 1972 H. OlA, Tokyo liaximui!l th liercury ~20 ...+51l·C n. OTA, Tokyo lIinimum th Alcohol -20, .. +50·C leksler, USA Indicating th lercury -20... ,+50"C

Po land Hallay, Poland Ordinary th lercury -37 .•.+50·C ,!,ll.l ...,!,0.3 t 3 years -30 ...+50·C lIiniliul. th -SO ...+3S·( ,!, O.S l -40 ... +30·C lIaximum th lIercury ~3S ... +50·C .30 ... +50"C Soil thermom. liercury -25 ...+45"C ,!, 0.4 ]{ -20 .. ,+40·C Kajawska Psychrometer Ilercury -30 .. ,+WC .: 0.2 ...':0.3 K -30 .. +40·C 'yhornia Hallay, Foland Yater th lIercury ~ 3.. .+38·C .: 0.2 K o .. +30·C

Portugal ihermoschneider Ordinary th lIercury "Ii .: 0,1 ]{ S...6 years -10 ..+50·C 7 Thermoschneider, Standard Therm., 1982 hxi.utI th lercury ,!, 0.2 I lIinimum. th AlCohol .!. 0.2 l Assmann-Ps. -th liercury .: ILl I

Mercury -10 ...+50·C ':U K I year +10 ...+50·C Qatar Case Iia ... 0 Repuhlic of Korea au, Japan Bimetal! -15 .. +35'C !. 0.5 K 5 years Identical with Interval of the meas. range 51 UIL & Daehan, Korea Liquid -40 ..+7O'e !. G.31(

Sri Lanka Liquid + 5... +40·C Intervals of 5 ,

Sweden Thermoschneidet Ordinary th lercury -35 ... +45"C t. 0.2 K 1~2 years Identical with Intervals of Heraeus Pt 100, 1974t19B6, the leas. range 10K Hewlett-Packard Dill 3450~ linil.tim th Alcohol -60 ..•+3G·C !. 0.3 K llaxiliUli th lercury -30 ...+50'C ':G,2K

The Netherlands Kon, Leerdn. lIax-imum th lIercury -40,.,+40'C .: 0.1 K 2 years -10 ...+40·C II Sensing Devices, Mod Pt 100 53.91-100 1.987 liniIUm th terrury ~20 ...+20'C !. 0.1 K -20 ...+2O"C , Ordinary th lIercury -30 ...+40'C ,!,U I -20 ...+WC 13 Seawater th lIercury -30 ...+40·C LUI 0... +30·C 4 Soil th MercurY -30 •.. +40'C i ILl K 0... +30·C 4 ~sychrol.. th lIercurY -15, ..+40"C !. 0.2 I. 0... +30·C 3

United Kingdom Zeal Ordinary th ~30 ...+·45"C 10 .0S ...!oO.2 I 0..+20'C 3 H. Tinsley & Co .Ltd , Mod. 51B7SA Pi-Sensor with precision AC-Bridge ASL model H7, 19BO /

TYPE OF IMSTRUlEIIT: THERIOIElERS

COUNTRY UNliF ACIURERJIODEL ACCURACY OF (OIStANCT OF CALlBRlTIOI CALIBRAtIOI COIPARlSOI IIIH CERTIFICATES DRSCRIPTIOH OF rRE CALIBRATIOK PROCESS 'ORWIG STAIIDARD COIIDlTIOIS ACCURACY I'TIOHAL STAIf()ARDS OF CA.LIBRATIOJl

Philippines leksler, USA 'axilum th .!. 0.02 ..-o.oa I ! 0.03 1 ! 0.05 I Y" Y" B. OU. Tol.:yo Maxilul th H. OlA, Tokyo linillum th Yeksler, USA Indicating th

Poland Rallay, Poland Ordinary th .!. 0.115 ..! 0.1 1 ! 0.05 1 ! 0.1 1 Every 5 years Y" IO·e: later bath, O·C: later-ice bath, Minimum th 10·C: alcohol bath Maximum th Soil therlilom. lajallska Psychrometer 'ytwornia Hallay, Poland later \h

Portugal Theflloschneider Ordinary th ! O.1l2 I ! 11.002 I I. Y" Total iuersion in a thermostatic bath

laxiInl th linimum th Assmann-Ps. -th.

Qatar Casella .!:. 0.01 K .!. 0.1 I 10 10 Thermostatic bath ,

~ ~ Republ Ic of Korea on, Japan .!:. 0.01 I Every year Y" Ther1.ostatic alcohol bath

UIl. t Deakan. Korea

Sri Lanka .!. 0.01 I .!. il.l I 10 10 Thermostatic bath

Sweden thermoschneider Ordinary th ~ 0.02 I .!. 0.02 I !. 0.1 I EYery year '0 HEro CirCUlating liquid

linie. th Maximum th

the Netherlands Kon. l.eerdam lIaximum th .!.0.O031 .!. 0.002 [ .!. 0.005 K Every 2 years Y" Alcoholic bath

laxiIU. th Ordinary th Sea,ater th SOl I th Psychroll. th

United Kingdom 'leal Ordinary th .!.O.OO14K .!. 0.002 I .!. 0.0035 I Every 2 years Yl!S Bath - 12 _

...... '...... C"l·....<"> <"> Q ... 1 ... 1 ... (·... ·1 ... 1 ... 1 ., ...... ""1 ...... ,·u ·uu ~~­ co .... co -co ~ ~ ...... C> I,,, +1·+1 ==... 1 ... 1=... 1 ~._-_._-

u u ,., :;;:~ u u ,., h ~ ~ .~ ~-:: ~ ':' ~

~ I~ = 7 - ,. ~ ~

~ ~~ t:'~ ~ .~ ~.~ ~ .~ ~ ~~ ~~ ~ ~ I :;

:::;:5 "~ " • ~ " "• " "[ .S .j .~ 'j ~ • :lj ,Ii :] ~ I .~ '" ~ fj ,; ~ I ~ .~ ill ID ~ " i" i ~ i ~ ] '" ,;!

I .~· ~ E i ~ § '" " TIPE OF IISTRUIEII: THERIOIETERS

COUKTRY UHlIFACTlIRER/IODEL ACCDRACY OF COISTAICY OF CALlBRATtOI CAUBRATIO' COIPlfttSOl 11TH CKRTIFICAUS DESCRIPtIOIf OF THE O.LIBRATIOK PROCESS lORlUlIG STlIIDARD COID!lIOIS ACCURACY IIATIOIAL STAIIOAftDS OF CALIBR1TIOJ

Uruguay Lalbrecht ! 0.1 I thenostatic bath [water. alcohol, Lambrecht laxiJ.U1D. th glycerine) Fuess laxil.uI tb

LaJilbrecht linilul th Thenoschneider linilul th Fuess Ordinary th

Yugoslavia laxilul. th ~ n.os t Every year

linilUI th

Ordinary th

~ w, TYPE OF IMSTRUn£lH: THERM06RAPHS

cammy MRNUFRCTURER/MOD EL PRINCI~LE OF MEASuREMENT LInITS Of CALIBRATION RAI>!&E OF NUMBER OF TYPE OF WORKING STIlNDI1RD OPt:RRTION RAMGE ERROR INTERVRL CALIBRATION CRL.POINTS

t:m~[ G 0 Rrgentina Siap. Telemet, S. Zaghi Bimetallic sensor -70 ... 3 yeqrs -7D ..+50 [ 5 Fuess Hq-thermometer, -20 ..+50 [ Negretti &: Zambra, toluol tho -80 ...HOOGC

P.ustnlia Various manufacturers Bimetallic sensor ! 0.5 K On issue and after +20., .+5QoC , Nercury in glass therlllometer repair

flustr i.a Thies, Lambrecht Bimetallic sensor -35 ...+WC ! 0.5 I:: Comparison: daily -2l! ..+30 GC 5 Bossecker, Hg-Tithermoffieter Calibration: after repair

Botswana Cqsella O... +50~C 1 year o ..+SD o[ 11

Chile Lambrecht, Mod. 252 Bimetallic sensor -35 ... +45~C ! 1 K '2 years -20 ...+45°C 14

Colaillnia Lambrecht Bimetallic sensor -10 ...+50"C 1 y~ar -10 ...+50"C

Fuess Bimetallic· sensor - 5... +50°C :t 0.2 K 1 year - 5.. ,+5"Ottc ~ Thies Bimetallic sensor -111. ..+SO"C :t 0.2 I:: ~ln ... +S[!"C " ...

Cyorus Siap, Mod. MT 1500 Bimetallic sensor - 5...+5So[ ! 11: 1 year G...+S5°C 3 Casella Hg-thermometer

Ecuador Thies, Fuess, CoLe Parmer Billletalli.c sensor -10 ...t50"C 1 year -10 ..+50 oC

Egypt I.ambrecht Bimetalhc sensor .,.10 ..+S5°C 2years -10 ... +SSOC W1)

E15alvador Fuess, Mod, 79 Bimetallic sensor - S...+50 oC ±. 3 ~ (?) 112. ..1 year

France Not reljularly -2ll ...tSOOC 4 Hg-thermometer, Flalin 25 !! llli.f.h Voltmeter Datron o German Demon. VEH Feinqeratenau Orebach, GDR Bimetallic sensor -23.,.+40 C ! 0.1 K Reoublic -35 ...+45°C ±. 0.3 K 4 years + 5... +35"C 3 Hg-therl1lornete r -:1,5 ...+65 OC :to.3 ...!O.51::

;.' Germany, Or. Muller, Lambrecht Bimetallic sensor -35 ...+45°C ±. 0.3 K 2-3 years -3&. .+4DoC Fed.Reo.of. Lambrecht. Mod. 252 Bimetallic sensor -35 ...+WC 2 years ~25 ...+aDer: 3 olQ i. tal thermometer. Pt 100 sensor DORIC, Mod. 05-100-5 TYPE OF INSTRUIlEMT: THERn061UIPHS commy MIlNUFIlCTURER/MODEl RCCURRCY OF CONSTRHCY OF CllllIR8T111N CRllIRRTlOM COI'IPRRISON WITH CERTIFICRTES DESCRIPTION OF THE CALlBRRTION PROCESS VORKlM& STRNDRRD CONDITIONS ACCURRCY NRTlONRl STIIN1lRRDS OF CRLI9RRTION

Rrqentina SiRP, Telellet, S.Zaghi ±0.1 K(1:=60s) ! 0.2 K Every 2 years y" Calibration chamber

Australia Various lIanufacturers -t 0.2 K ! 0.1. U.in ±0.5 K No No TherIQograph placed in OlJen, adjustment until agreement occurs

Rustria Thies, Lambrecht ! 0.1 K ! 0.3 K ! 0.5 K Not regularly For own use Climatic chamber, driyen hy an automatic only program. Outdoors.

Botswana Casella :t 0.2 K Y"

! 1 K No No Climatic cha~ber Th .Fr iedrichs, Chile LalllbrecM, Mod. 252 ±1 K Mnd. 240/40, driyen by an autnmatic prngram

Cl illatic chamber Lambrecht Y" ,... Cnlambia Climatic chamber Fuess Eyery year Y" Climatic chamber '" Thies Y"

Sensing element immersed in a water bath ±. 0.1 K ±. 0.5 K No No Cyprus SIfIP , Nn climatic chamber available. Ecuadnr Thies, Fuess, Cnle Parmer Cnmparison llIith other instruments in a meteorological shelter

±. 0.1 K No Y" Temperature Test CabineU Egypt Lambrecht ! 0.1 K ±. 0.1 K

No No Same as Ecuadnr El Salvador Fuess, Mnd. 79

±. 0.5 K Every 2 years No France Platin; ±. 0.05 K ±. 0.1 K

Rutnilatic IIInrking climatic challlber, ±. 0.3 K Every 2 years Y" oerman Delllocr. VEE Feingeratebau Orebaell, GOR ±. 0.05 K ±. 0.2 K adjusting nutside of the challber. Repub lie

Climatic chamber ±. 0.3 K Every 10 years Y" Germany, Dr. Muller, Lambrecht ±. 0.1 <0.2) K + 0.1 (0.3) I::. The sensor is immersed intn a bath of ±. 0.15 K Every 5 years Y" Fed .Rep .nf Lambrecht, Mod. 252 i.O.U: ±0.05 K ethyl alcnhol TYPE OF INSTRUImlT: THERnOfiRRPHS

commv MfUlUFRCTURER/Mon EL PRINCIPLE OF MEASUREMENT LInITS OF CHLIBRflTlON RflNGE OF NUI'lBF.R OF TYPE OF 1lI0RKHifi STA.NDAKD OPERHHON Ra~GE ERROR INTERiJflL CflLIIlRflTlON CFlL. POUlTS

Greece LalllbreE~t, Mod. 251 Bimetallic sensor -35 ... t45~C it.5*C;l l yea,r -35 ...+45°C.

HonQ Konq Rosemount. Mod, tl 3418 PlatinulA resistor -10 ..+WC i 0.2 K 2 years + 5 ..+40 0C about 20 Ii set of Hg-therlllometers, ZeaL 1978

Hunqary Soviet Union, !'lod. 1'11611 Billletall i.c sensor -30 ...+40 Q C ±. u: 2-5 years -30 ... t40"C IJltracust Electronic Thermometer, Mod. 5670, 1984

Intlonesia DeHort. 8imetalEc sensor -12 ... t43"C 5 years Hg-thermometer Lallhrecht 8illletalli.c seF\sor 0...t40"[ 5 years Kahlsico Il imetallic sensor ~ 5" •••+55"C 5 years ThLes Blmetall ic sensor -lO ...+40"C 5' years

Japan Ota Keiki. Seisakllsho, !'Iod. 1 Bimetallic sensor -15 ..t40"C 5 yeilrs 3 or 4 &lass t.hermometer

Jordan Lambrecht, tlod. 25"1. Bimetallic sensor 2 years I

~ Kenia Casella, tlod, 7'2:1J, 725" Bimetallic sensor 1] ... t50"C Neqretti &: Za,bra, 1732z, 471J1z BimetaWc sensor -10., .+45"C 1/2.,.1 Year , Pt-thermometer ~ith ~heatstone '" Lambrecht ( tlod. 251a Bimetallic Sensor 1] •••+40"C bridge, 1971

tlaroc Jules Richard -15 ...+40"C ±0.3 K 5 yeqrs ~ 5 ..+4{)"c. 6 Liquid tn qlass thermometer, - 5...+50"C ±0.3 K 5 years - 5...t40"C 6 Thermo-Schneider, 1980

0 New Zealand Darton, Negretti a Zambri;!, Himetallic sensor _ 5...t35"C ±0.5 l:: After repair D... +30 [ 2 Zealot Oobhie instruments, Hnzanith, Short Ii tlason, Inspectors thermometers, 1978 Larnhrecht

Paki~an Short a nason Bimetallic sensor -25 ...+50"1: ! 1 K 2 years t 5 ..+40"C 3-6 Casella Hq-thermOllleters, 1970-80

Philiopines Ota Keiki Seisakusho Bimetallic sens,or -15 ..+40"C ±n: 1-2 years ,.10' .. tW[ Hg-thermometer, 11HZ

"'~5 Poland 9betallic sensor ..+45",[ ! 1 K 2 years -20 ...+30"C Hg-therlllolileter, Thermo~Schneider, Tyee KII Tm OF I"H!1!IlENT: THEllnOSllRPHS

COUNTRY nRNUFRCTURER'MOIlEL ACCURRC~ OF CONSTANCY OF CAllilHTIOll CAlIBRRTION (WIlRISON 11TH C£1lTIFICAT£S DESCRIPTION OF THE CALIBRInION PROCESS ~ORl:IH6 STANDRRD CONDITIONS ReCURRCY NRTIONRl STRHURRDS or CRLIBRIITION Greece lalbrecht, Mod. 251

Hong Kong RoseliOlml, !lod. EL 3418 ! 1J ,02 r ±0.1 K ! 0.2 K No No Water baU

Hungary Snviet Union, Mod. 1l16f1 ! 0.1 K 0.11(0.2) K 0.1 K [very 2 years Yes eli.aUe challber

Indonesia DeIfort Open liquid bath. Heatin~ by an electric Lambrecht heating spiral, cooling by adding ice Kahisico into the bath TIdes

Japan Ota Kei\:i Seisal:.usho, Mod. 1 ! 0.2 t:: ! 0.2 K Every 2 years Yes

Jordan Lalbrecht, Mod. 251 Yes Yes ,

~ t::enia Casella, MtH!. 721l, 725 ! 2.5 K No On request Clttllatic chamber. Readings in increasing Ii \""'" Negretti aZalbra, 1732z. 47012 and decreasin~ direction ~! I Lambrecht. Mod. 251a

Maroc Jules Richard ±,.0.05 I:: ! 0.3 r:: ! D.1 I::: No

New Zealand Darton, Negretti lI: Zalllbra ! 0.1 K ! 0.3 Kshort ten stability ! 0.4 K No r" Refri~erator at O~C, Hezzanith, S!lart 8: nason temperature cabinett at + 30"C Lambrecht

Pakistan Short a !'Iason ! 0.0 K !U: llithin 2-3 years Yes

Philippines ota Kaiki Seisakusho Correction ! 0.03 K !1~ (?) Yes Yes Clillatic chamber, readings are taken in (-0.01. ..-0.08 () both diredions (up and dalfnl. Certifi- cate of calibration containing correc- hanS for the user of the instrument

Poland ! 0.1 K ! 9.2 K ! 0.1 K Y" Y" Clillatic chamber TYPE O~ INSTRIIltENT: THERMGRRPIlS

COUNTRY IlRNUFRCTURfR/llODEL PRINCIPLE OF t1ERSUI1£IlENT ,1!HS Of CRlIBRRTIO~ RRII&E OF NUMBI:R OF TYPE OF 1lI0RKIN& STRNDARD OPERRTION RlIM&E ERROR INTtRlJRL CALIBRATION CAL.POINT

Ri~kard Portugal stAP H1260, 110 5484 BimetaHic sl!nsor ~t5 .•.+5QoC ! 1 K 1~2 year.!; -10 ..t400C , ~lJ':'therllloljleter, Thermo-Schneider, OTR Tlil1, Thies 2.0604.00 1982 !'lJeSs 79c, Lambrecht 252, Bimetallic sensor -10 .•.+50 oC ! 1 K 1 year -10 ..+4QOC Thies U16240a.Oll

~llatar Lafllbrecht o 0 2511Z51a. BiMetallic sensor .,.10 ...+50 t ! 1.5 ~ (?) 1 year .,.10 ..+40 [ Hq-thernrometer, Casella

I TYPE Of IIlSBUlIEMT: TIIElIlOHAPKS

COUNTRY nRNUFRCTUftfR/nODEL ftCC1IIRCI OF COIISIIIIICI Of CIIl1111111iJll CRllIlRllOli COIIPRIISOII 111M c£!llFICRIES DESCRIPTION OF TilE CRLIBRIlTHIN PROCESS 'ORtING STANBRRB COMBITIONS . ACCURACY NRnON!lL SIIlilOIII!OS OF CRLIBRATION

Portugal SiAP Tn260. Richard NO 5414 ! 0.02 ~ ! 0.5 I: ! 0.5 I:: les Rir telperature controlled cabineU OTR TGIL Thies 2,0604.00 •• Fuess 75c. Laltlrecht 252. Thies 1.0&2400.011

Quatar Lalbrecht 251/251<1 ! 0,1 K ! 0.1 K Therllloqraphs are kept inside a . Readinqs at different tempe- rature points are ta\::en simultaneously at thermolleter and thernoqraph

Spain Thies ! 0.15 I:: ! 0.01 r:: ! 0.015 r:: Every 3 lonths N. Bath

Sudan Darton a Co.

The Netherlands Fuess/Dr. IlUller ! 0.003 I: ! 0.002 I:: ! 0.005 r:: Every 2 years les The telllperatlJre sensor is placed in an

ethanol bath together with the referente ~ needle Tolerance requirements: ! 0.5" I:

Tunisia Jules Richard. lalbrecht. ! 0.1 I: ! 0.3 I: No r

lXuguay Selfort _10.1 r:: ! 0.2 I: I" tyPE OF USIRUtEIIT: II'tG~OlEtt!l:s

COUNTRY IIAlIiJ"FACTURgR/IODEt PRINCIPLE OF .EiSll~EIEIIT LIlns OF CiLIBllllION RANGE OF tru.BER OF TYPE OF lORKING StAHDARD OPERATION RANGE ERROR m~RYAt CALIBRlIIOIi CAL.POIRTS

Austria Hair o .. 100'0 RH See tIO-PtibIi- 20 ..100'1 RII Assaann Psychrometer , catioll IiQ a BUlgaria USSR; Mod. 1-39 20 ...100'" R~ ! 7 '0 RII 1 ~ear 311 .. JOII" RII B Psychrol.etet USSR, lad, I'~ 1 3lL. .100t RR .t 10% RII Pilland, iod. TS-12, TS-H 20 ••. 100'0 RII .t Ill" all GDR 20, ..100\ RR !. lot RII USSR, Mad.· 1'''41 Psychrilleter 10 ...100t RII USSR, Iild, l~g4 Psythroieter 10...100% RII Pola1\d; 100. T2-9 Psycllrojetet 10., .lOll% RH 6DR Psychroleter 10 ... l1111t RII

Chile Dt. lli.ller; lod. 32/40 Psychroileter 0...100% RII !. 3 " Z ytats (Assiattn-typel

vaisala, lod. IIII 3i capacity O... lOOt RII 0.;.80t; !,2'0 12...97 % 2 Vaisala 1111111, Liel, 12 S04 8L.IGOt.::,i 3," Dr. liiller, lod. 28/2 Psychrili.eter ? .. lOO% RH !. 3 l;; RII 2 years (August-type)

Chiba Shanghai Factory Changchun Factory lIair lL .100li RH .i 5 " RII 1 yeaI'

Czechoslovakia PsyehI'Oii!t~t O•. ,lOO~ QH t.. 1 ~ RII ~ years 1 Psythriliieter, Assllann-type, 1961 ~ Hair .t " %RR " franCe Capaci ty 10 .•.98 %!iM 3 Dewpoint

Ger.an Delloet. VEB En DreSdeil., GDR Psychtbileht ·~O ..•t40"C t.. 0.1 k Z·lG yeats RepUblic Type 11, Type He (Assilann-typ~l

GerIany, FriedriChs; La.brecht, Thies Hair ' OCllll. ..lllOt RH ~2 ...3 %' lot regularly 30 .•.95 li Il.R , Psychroi:eter Fed,Rep.of. HUIidi ty trafisili Her

India Psycbr'liileter -10 ... ~60·C II .. ~4O"C 5 Psychrometer (Assilanil-typ~)

Japan Yoshino Ketki, lild. ,5~ Hair L.IOO\RR .to.2 I 5 ,ears -2L.+4O"t 1 Psychrometer Ota Ieiki Seisakil.Sho a.O. Hair 0...100% RH i 5 li RR 5 years 20.. .98\ RR Iod. " Ifakaasa Instr\lleilts Ltd. wel De'[l.biilt 0', .100': RH .t S ~ RH 5 yeats 20.-. .98% RM '~d, £-771 longlilia USSR, lod. I. U 3L.lOO\ RII ! 15 '-RK 1/2 yeat 30 ••• 98% RU TYPE OF 11Slll1llm: HlGllOIETEBS

COolffRY IANUFACTURERIlODEL IctUlAC1 OF CIlISlIICI OF CALi",llUl CILlllAlllll CIlIPIIISOl IlllI cmlFICIlRS DESCRIPTIOlt OF THE CALIBRATION PROCESS IOIlUR SIIIDI!D CIlIDIllIllS ICCU!lACI ,annAL stAIDAIDS OF C!LIIRIllIlll Austria ! 3' liB .!. 3 , IN .. los

Bulgaria USSR, lod. 1-39 I" BYCfostatic chuber, Fentron, liDR USSR, Ind. n-l Paland, 'od. TS-IZ, TS-l~ GDR USSR, 'od. 0-4' USSR, Ind. 1-34 Poland, Rod. TZ-9 GDR

Chile Dr. tuller, 'od. 32140 Tller_tm !. 0.2 I Tetperature chuller, Friedrichs, lad. 8221, licroprocessor controlled Yaisala, .Iud. HlI 31 !. 0.3 ,

Dr. luller, lad. 28/2 !. 0.01 I

China Shanghai Factory !. 2 , liB Every 3 years I" Sale as Hygrographs CbaogchvD Factory

I C~ecboslovakia !. 2 , RH E,ery 2 years los Ii li:j! ,I France 180 , RN: II , IIU 1. 0.11 ? .!. 3 , liN Calibration chamber )Zotlk.!.ltaa lieren Detocr. YEB ERJ Dresden, liDR Separate calibration of thenol!eters Republic Type 11, Type Hc and aspirator equi pl.ent

Genany, friedricbs, Lallbrecht, Thies !.a.ll~l!ltlll !. '.'51 ~I ! 0.5' IB !1.5'RH ber, 5 years It Test chuber, I.icroprocessor controlled Fed.Bell·of Hnidity transaitter

India separate calibration of tberaaaeter and aspirator equip.ent

Japan Yoshino lerki. lod. 54 !O.2 I. !. 0.1 Ills tYery 2 ,ears los Ota [eiki Seisakusha a.CI. lod. 4 lakaasa InstrUIents Ltd. lod. E-171 longotia USSR, lad. 119 TYPE OF INSTRIIIEfT:. HY6RO~'fERS

COUNIRY tARifF ~(:TlIRER/IOQEL PRHlCIP~E OF '!"U~l!Efl L!III~ OF CALIlRAIlO.1I RiNGE OF ~BER OF TYPE OF VORnKS SUHDiRD OP~UTIO~ ~ll!ll i!!lUI !1"lVIL CILIBi\llIOl ~iL.I'QIIITS

Torsion hygrol!!1er Z... ~ rejlrs ~ !'Iof1lay RU5.seltvedt , ,., .. 20 .... 97 Ril 9 Psychrollletef, isslal1n type. Fuess 32c _itb electric ventilator Friedrichs. LiiJllrecht psy~hrQset~r A Lalllbrecht, Wod. aoo !lair ZO ••• IOO t ~U ,iP::1qI Rotronic

Pakistan Shllrt & Kasllh. Psychro.eter ~10 ...tWC ! 0.2 I: Z years 15 .•.85 ';: Ril 5 Psychro.eter ·2.5 •. ,t~Q·C

Poland Polish lIlade, lod. TZ-9 Psycnr"OJete;r In...l00 ~ RU 2 y~jrs

Repuhlic of Korea au., Japan Psy~hroIeter 0,.,100% RU 5 years 30 ...90 % RII

S.. itzerland Lambrecht, Type SOOLIOO !lair 5.. ,100 t HU 5...100 t Ril 10 liB' ~lektronik A6, lod. DPa .. ith Radiation Shield Dew Point Hygrometer leteolabor! Type VTP6 "Thygan" lle.~point cen DP-55 .. '-HO"e .80., •+50'C Ventilated Thermohygrol.eter

Sweden Rotrilnic AG, rAIOO tapacit

United ~inll"dol Phys. Chelical Research Corp. Che,ically treated 1Q ••• 1QQ t RR ! 4 'RJI 6 lonths 2.5 ...100" RK B General Eastern, Dell-point mirror lod. PCRC.ll ll!astic wafer i,pedante change TYPE OF IISTRUIE!1: HY6ROIETERS

COUHTRY IAIfUFACTl/RER/IOIlEL ACCURACY OF COASTlIICY OF C"LlBRmOA CALlBRATIOII cOIPARISOIf InH CERTIFICATES DESCRIPTION OF THE CALIBRmON PROCESS IORUIf& STAIDARD COIDnIOIS , ACCURACY ,mOlAL STANDARDS OF CALlBRATIOI lIorway RU5seltvedt ~ 2 ,. RH !.2...!.4\RN Yes Yes Clillate cabinett, K. leiss, lod. 300 AB/30, 1973, Friedrichs, Lambrecht Autoaatic regulation of temperature and Lambrecht, lod. 800 relative humidity Rotronic

Pakistan Short & lason !. S ,. RN !. 5 'i RR bery 2 years Yes HUlidity calibration chamber lith a fan

Poland Palish lade, lod. TZ-9

Republic of Korea OU, Japan ~2,5"RH !,2.5'iRH E,ery year Yes Rulidity chamber, leiss, Type 1301ZAB120J, 19B7

S,itzer land Lambrecht, Type BOOLlOO See q. !.n; RH !, I \ aN A, Clillatic test chamber, leiss, with Radiation Shield "' Type 200 ABT d120 leteolabor, Type VTPG -Thygan" Vent ilated· Ther,ohygroaeter

Sweden Rotronic AG. IN 100 !.O.5\RH !.O.l\RH !, 1 %RN A, A, Asllall closed chalber equipped lith LiCl-liquid which saturation is known N LaJibrecht, 8001.1110 !. 1': RN !. 11.5 ,. aH !. 2 ,. aN A, later steam in a small room, which rises '''', "' frol prevai ling RII to 95 %RH

United Kingdol Phys. Chelical Research Corp. HO \ RH:!.0.5 ,. RR !. o.a I !,5' RN at hirh aft values 1 year Yes led. PCRC-II 140' RH:!,1.25 , RN !.l% RN at lot RN 'alues TYfE or INSlRUII£Nl: HYGROGRAPIIS

COUNTRY "~NIIf~CTijlE!/"OOa lRliiClPlC Of IlCASl!lCIl!llT UIlIS Of CAlIIIRT!iIII I~N6E OF NURRE! OF lYfE OF 1I0RKING STA!IllARD IlIWT!ill IIll!6E CRRIII lilTEI\IAl CAlIBRATION CAl.POINTS

Arqentina flair D...100t ill 2 years 20 ..g7t 1M 3 Bendix-Friez ventilated psychrometer , August type psychrolleter

Australia Negretti S: Zalhra, Hair D... 951 Ril 5 I IH Not regularly 15 ...m RH 4 1. Bendix psychrometer Shart 8: lIasan 2. General Eastern De~-point-mirror, Mad. 1500

Banqladesh Casella, Landon Hair 0...100t RH ±3 t RH bebeen 1 \lear 20 ... 90~ ill 8 Hair-Hygrograph Hisamatsu Mfg Co, 20 and 80 I Rfl Japan. Mod. TN-4

Botswana Case 11a 0...1001 iH 1 year Every 10 ~ RIl SiAl', Cl-5200-19S'5

Bulqaria USSR, Mad. M-32 ZO .. .1001 ill i101iH J \lears 30 ..100t iH 8 Psychrometer USSR, Mod. M-21 30 ...1DOI IH tIOIRH 3 years 30 ..100~ RIl 8 faland, rtad. T-15 10 ...100\ IN t10tRH J years 30 ... 100~ RH 8 CSSR, Mqd. Metra*864 20 .. ~1001 Rf! ilDtRH 3 \lears 30., .1001 RIl 8 GOR, Mod. Fischer 20 ...1001 lH ±10l1H 3 years 30.; .100t Rf! 8

Chi.le lIr . A. nuller • ~od. 79t Hair D•..1001 iN ± 3 I IN 2 years Friedrichs. Climatic chamber. 1984 , Lambrecht. Mod. Ilair 0...1001 IN ± 3 .IIIH 2 years , 25'2 ~

China Shanghai Factory.Chanqchun fact. Hair D.•.lOoa RIl ± 5 I IN 1 year aO ...1001 RIl

ColoMbia Thies, Mod. 610 Hair D•••10M: IN ! 2 aIH 1 Yeir 30 ...100& RH 4 fsychrollleter Fuess, lind. lOBW Hilir 0...1001 IH ! 2 I R~

Ecuador Lalbncht. Thies, Fuess. Hiir 0..•1001 IH l's\,chrolleter Cole-farer

Egypt la.brecht Hair . 10 ...1001 III 2 years 5...100a RIl

El Salvador Fuess, lIod. 107-2. 108. 108' Hair 0...1001IH ! 311H 6-12 lonths

Ethiopia l)gawa Seiti !fair a: ..1001 IU i 51 RN Not regularly 10.:'..981 III Steps !if Psychrolleter of the test chamber 5 t RIl

France Not regularly 10 ....98t III 4 Dewpoint h\lgrometer ELCOlilA TYPE OF INSTRUMENT: HYGROGRAPHS

COUNTRY MANUFACTURER/MODEL ACCURRCY OF CONSTRMCY OF CAlIBRRTION CRLIBRRTION COltF'RRISON lITH CElITIFlCRTES DESCRIPTION OF THE CALIBRRTION PROCESS ~ORKING STRMDIlRD COMDITIOMS RCCURRCY NRTION~l STRNDRRD OF CRLIBRRTION

Rrgentina 3! :!: 5 i Every 2: years y" The hair bundle is wetted ~ith destilled liIater and the instrUHlent adjusted to 97 ~ RH. Calibration challber ~ith 20 %and 50 ~ RH

Australia Negretti 8: Zambra, ±. 2% RH Bendix ±. 1 l RH/hr ±. 3 % No No flumidity chamber containing a tray of Short 8: Mason ±. n RH General Eastern saturated salt solution

Bangladesh Casella, London :!::n beheen ±. 3 %between y" yO' Humidification and Dehumidification in a 20 and 80 %RH 20 and 80 % RH chamber. The process is repeated several tilles

Botswana Casella ±.5% ! 5 % y" yO'

Bulgaria USSR, Mod. M-32 yO' Humidity chamber, Fentron, FR6. Psychrometer

Chile Or. R. Mtiller, Mod. 79t ±2 % RH ±3 % RH No No Lamhrecht, Mod. 252 '",I

China Shanghai Factory,Changchun Fact. ! 2. % RH Every 3 years yO' Storage in saturated air for at least 6 hours. Hygrostat: beginning liIith 1001'; RH, steps to 30% RH and back to 100% RH. Repetition

Colombia Thies, Mod. 610 95 % C?l 95 ;; (?) 95 'I; (?) Every year yO' Karl lIeiss, Climate chamber 300 AB/10IM

Ecuador Lambrecht, Thies, Fuess, ±3 ~ RH yO' No climatic chamber available. Calibra- Cole-Parmer tion in accordance w1th prevailing clima- tic conditions.

Egypt Larrtlrecht ± 5" % RH ±. 2. i RH ±. 5" 'I; RH yO' Test cabinett, Brabender, Mod. KSP 300/30-N

E1 Salvador Fuess, !'lod. 107-2, 108, 108'i1 ±. 2 % RH No No

Ethiopia Ogawa Seikl ±0.2. KDewPoint Temp. ±. 5" %RH No y" ALl1:omatic controlled climatic challber, Koettermann, Mod. 201

France ! 3 ~ Climatic chamber TYPE UF INSTRUlI£I,IT,: HY&RO&RRPH$

COUNTRY MRNUH1CTURER/nOllEL PR1NCIPLE DF ME~SUREIIENT LlMITS OF CRLIBRRTION RRNGE OF NUMBER PF TYPE OF ~ORI::IN6 STANIlRRIl OPERATIOM RRN6E EUOR INiER~AL CRLIBRflTlON CAL.POINTS

&efman ~ell!nr,r. VEB Feingeratea~u Orebach. Hair D... 1[}O~ RH ~2@Rj,I:±3~ '2 Years 25 ...1oo%: RH VEB ERIJ.I Dresden, GDR; Rssmann Republic Mod. 305 <~O~RH:±,S~ psychrometer /

(JermanI' , Dr. Muller. Lambrecht Hair o .. 1001: RH i 3 1: 2-3years 25 •• •9n RH Psychrometer Fed.Rep.nf Lambrecht. Mod. 2S2 Hair o .. 100~ RH 2 years 30 ... 90~ RH Psychrometer

Greece SiJ1P, Mod. UM7100-7120 Hair o .. 100l RH i3 ~ RH 1 year ZOL .95% RH lambrecht., Mod. 250 Hair O.5%; ..100% RH ±'2.5~RH 1 year

Hunqary USSR. Mod. M21 Ha~r 30 .. lOO~ RH ±. 5 %: RH 2 ..5 years Ultrakust Semiconductor psychrometer, Mod. 5670

Indonesia Belfort, USA. Mod. 5-594 Half D...lOO%: RH Psychrometer Lambrecht, Mod. 252 Hair 0, ..100% RH Kahls!'co. USA, Mod. lljAM14GIL Hair O...IOO%: RH Th ies, Mod. 1-062D. 00 H~ir O...llJO%: RH

I ...; Jordan Lambrecht H~ir 5... 1lJO% RH :!:.Z,5%RH 2 year$ 5.... 95~ RH 11 ,>c

Kenya Casella. Mod TZIj,720 Hair 0...;OD%: RH Neqretti & Zambra, Mod. 1732z, Hair 0... 100% RH 4701z Lambrer,ht. Mol$. 251 Hair 0...100% RH 6...12 months 30 ...100%: RH 3 Psychrometer

Maroc Jules Richard Hair o.. .100~ RH ±.. 5 t RH 5 years 30 ...100% RH 4 Psychrometer

Mongoli.a USSR. Mod. r'l21 30 ... 100~ RH ±15%(?) 6 months 30 ... lOO~ RH I USSR, Mod. M-34!'1. 1971

New Zealand Negretti 1I Zambra. LalDllrecht Hair o... 100~ RH ±5 % RH Not regul;uly calibr. 30. ,,95% RH 2 Psychrometer (Hq) Zeal or Dobbie Instruments

Nigeria Casella Hair 0, ..100% ~H ±3 1 Rif 4 years 10 ...100% RH 10

Pakistan Casella and other Hair o .. 100% RH ! 5 %RH 2: yei;lrs 15 ...RS%: RH psychrometer TYPE OF INSTRUMENT: HYliR06RRPHS

COUNTRY MRNUFRCTURER/MODEL RCC:URRCY OF CONSTRNCY OF CRLIBRRTION CRLIBRflTION COnPflRISON IIITH CERTIFICRTES DESCRIPTION OF THE CALIBRATION PROCESS llORI:IN6 STIINDARD CONDITIONS ACCURRCY NRTIONHL STANDRRn Of CRLIBRATION

German Democr. VEB Feingeditebau Drebach, ±.1,5%RH ±. 1 %RH ±. 3 % Every 2 years Y" Lallier calillration point: Comparison in a Republic Mod. 305 laboratory, equipped \IIith air condition. UllllH calibration point: Simple chamber filled \IIith saturated vapour.

Germany, Dr. Muller.· Lambrecht ±. 0.2 KDelllPoint Temp. ±. 3 % RH .±. 3 % RH Every 10 years y" Rir conditioning cabinet Fed ,Reo. of Lambrecht. Mod, 252 ±. 1 % RH ±. 0.5. %RH ±.1.5%RH Every '5 years Y" Automatic controlled climatic chamber

Greece SiAP, Mod. UM7100-7120 '±'O.l%RH No No Clilatic chamber: Votsch Hi5henklima~ Lambrecht. Mod. 250 kalllmer, Mod. 607

Hungary um, Mod. M21 ±. 1 %RH ±. 1 % RH Y" Y" 1. Tempering of hair bundles t\llice beheen 20 and lUG % RH 2. Adjustment 3. Calillration in 5 steps I 20 ...100 % RH

Indonesia Selfort. USA. Mod. 5-594 R. Fuess, Hygrostat. Mod. E 316, 1952. Lambrecht, Mad. 252 Hu~idity can be lIIanipulated by a silica Kahlsico, USA. fl.od. 19AM140/L gel dryer and by a sprinkler Thies, Mod. 1.0620.00 ,

~, Jordan Lambrecht No Y" Th. Friedrichs, Type 8222 chamber ," • ,

Kenya Casella, Mod. 725, no No No Humidity chamber Ne~retti ~ Zambra, Mod. 1732z, 4701z Lambrecht

Maroc Jules Richard .±. 3 % RH .±. 3 % RH Y" Chamber

Mongolia USSR. Mod, M21 ±'1.5-3.5~ RH ! 2 % RH ±. 1 % RH Every 3 years Y" Hy~rostat

New Zealand Negretti & Zambra, Lamllrecht See q. for details .±. 3 ~ RH ±. 3 % RH No No 95 ~ RH: Calibration after the hair element is wetted. 35 % RH: CaCb in a fan circulated cabinett. Co~parison \IIi th a psychrometer,

Ni.geria Casella Climatic chamber, Friedrichs Mod. 7069

Pakistan Casella and other ± 5 % RH ±. 5 %RH 2 years Y" Humidity Calibration chamber TYPE of IIISTRUlIElii, IIItloiiilllHS cOIiiliJIy IlAIiJFAcilillelillOOEi. PR!IitI'le !IF llEiI5li11E/ill1t Uhltlili clll.IIIAT!1!lI i19M6E OF NUnBER OF llPE OF ~ORt::IM6 STRNDRRD OIEIITlOil j- Elloi INTEllllll clll.liRRTION CRl-POIm

Philippines Helfort. US~ H~it klQUI iN ! S ~IIH 1-2 yeilfs 30, .. 100~ RH Psychrometer (Hlj), 197~ , Poland Polish lade, "od. TZ 15 Rail' U...IOUI IN ! S, IN 2-years gO.,.l00~~H Psychrometer (Rss-mann)

Portuga.l Fuess, Thies. taiihrer.:ht H"ir O... lao~ MH 13 t 11M 1 yeaI' 30.,.100'1 RN Psychrolleter (flssiiaMhJ

CUatar Laliilirecht Hiiir klOUl IN !2.51RIf i yl'er 10 ...loot R~ 10

Rep. of Korea bt~ (Japan) ~air D, ..10b~ 1M ! 7 i iH 5 years 30 .... 90~ R~

The N.etherlands Fuess/Hilile:r Hiiii" kioOl RN ! 6: I it! 1 year aO ...l0oi ~H "icMll Del/Point mirror, 2 Rl)troriic trailsliiitWs as backup

Tunisia JiJHis ~ichard. Lailibritht. H;iir L.liUIRH ! at RH 1 year 15 ....~m iN 2 PS}ichro5rete:r {STILD I Iilliiu .., 00 I lJrugu~y gelfGtt. liilbfetht. Hair klODIIH !5, ..!llll aH 20 .. ;~5! II.H 4 PsyChrometer August

Yligos1

COUNTRY nRNUFRCTURER/nODEL ACCURRCY OF COMSTRNCr OF CRLIBRATION CALIBRRTION COnPRRISON lITH CERTIflCRTES DESCllIPTIDN OF THE CRLI8RHTION PRaCESS IORKING STRNDRRD CONDITIONS ACCURRCY NRTIONRL STRHIlRRD OF CALIBRRTION

Philippines SeIfort, USA See q. for details ±n.5 %RH ±. 1 %RH y" y" Climatic cahmber

Poland Polish made, Mod. TZ 15" ! 1 %RH ±Z %RH ±. Z %RH Yes Yes 6 instruments are calibrated in a Hygro- chamber simultaneously

Portugal Fuess, Thies, Lambrecht ± 1 %RH ! 1 %RH ! Z %RH '0 Yes Telilperature / hUlllidity controlled cabinett

Ouatar Lambrecht !2.5%RH ! 1 %RH Yes No f-Iumidity chamber

Rep. of Korea Ont (Japan) ±2.5%RH !2.5%RH Every year Yes Humidity chamber, Ijeiss, Mod. 130/ZRB!2DJ

The Netherlands Fuess/Muller ! 1 f; RH 1. .. 2% RH i 2 %RH Yes Climate chamber, ]jeiss, for calibration. '0 Additional control-check: Uarying the temperature (-30 -lOeC) at constant hUliidity (70 f; RHl

Tunisia Jules Richard, Lambrecht Psychr.therm. ±11.1 K ± 5 f; '0 Isuzu '"'0, Uruguay SeIfort, Lambrecht Psychr.therill. ±. 0.1 K ±. 5" % Yes Climatic chamber, Tenney, 1975

Yugoslavia ·Psychr.therm. ±. 0.05 K Every year Yes TY~E OF INSTRUlIENT: BRROnETEI1S

COIJNTRY nANUFRCTURER/rtOOEL PRIIitIPLE OF I!ERSUREIl£NI LI"ITS OF C9lURRTION RAI'" OF NUI18-£R OF TYPE OF ~OR«:ING STRNORRII OPERATIDM RllIiE ERROR INTERVflL CAllBRJlllOI CRL.POIHTS f1rqentina SHIP, S~f1, Negretti 8: Zalll~ra, Mercury w!UlQn 880, .. 110& hl'a ! 1).4 hPa !i yeilrs Oepends on the , Fixed cistern mercury barometer Meteoroloqia Argentina 547 ...11)67 hPa measllfinq ranlle ~gretti 8: Za!lbra

Australia Various manufacturers, I'terctlry \ B70 •. 1100 hPa ± 0.2 hPa Not fEiqularly B70 ...1100 hPa , N &- Z precision aneroid barometers, Kew station type 19&0-65, Mod. M1991, 11:122& Hegretti & Zalbra, Digital Aneroid 9lJO ...1050 hPa ±0.3 hPa 90a ...1050 hPa HI hPa in- BOO ...1050 hPa BOO ...1050 hPa tervaIls Vaisal

Aust.ria Fuess, Kroneis, Lambrecht Mercury 600 ...1200 hPa ±O.lhPa 3 years 900 ..1U1O hPa 5 lQIII Hg-in- Fuess, Mercury barometer, 600 ...1000 hPa tefvalls Type 11i

Bangladesh Darton 8: Co., Mod. !1KI! Mercury 8.7ll ...1100 IIPa ±0.25 IIPa 1 year 900 ..1040 hPa , Garton, Fortin barometer Ke~ pattern barometer

Benin Societe Precis Mecanique tlercury 7S0 ...1040 hPa z...6 years 18" SP", Portable Fortin barometer

Bl'Itsjjana Precis Mkmique, Casella Forti.n, Kelll Dependinq on the I:very 5: hPa SPtL Fortin barometer, lf~l!!i .., lReasur inq range 0

BUlgaria USSR, Type KR 800 .•.1090 hPa ± 0.2 hPa 5: years 20 USSR, Type &CO USSR, Type SR-FI BI0 ...107[J IIPa ±0.5 bPa 3 years 20 USSR, Type Ill., 1978 USSR, Type SR-B 680 ...1070 hPa ± 0.5 hPa 3 Yt'!ars 20 USSR, TYPe IR 440 ...1070 hfla ± U.3 liP

Chile Fuess, Type 11b rtercur,y 5BO .. ,1025 hPa ± 0.1 u'Hq :3 years Lambrecht, Mod. 610 t1erwry $OO.,.lOBO IIPa ±O.l'l Hg Thies, Mod, 3.1550.17.000 t1ercury 8.0G ...108ll IIPa to.ShPa Vaisala, Portable barometer, BOI) ...1050 hPa 1 year Mod. PFI-21 , Digital readont Fuess, Type 11a Mercury 800 ...ln70 hPa to.1111 Hq :3 years

China Chanllchun Factory, China rtercury BID ...1070 hPa ±. 0,2 hPa :3 years Adjustable cistern baroleter Fixed cistern barometer lIercury BlO...1070. IIPa ±. 0.3 hPa

ColOJllbia Thies lIercury 560 ...1030 hPa ! 0.3 bPa 1 year 10 ...80~ of the 7 Fuess, Barometer, TYDe 11 I~ instrUlent stale Green, Mod. 110 Mercury TYPE OF INSTtUIlENT: BAROMETERS

COUIiTl!.Y MRNUFRCTURER /1I0DEl IlCCURRCY Of CONSTflNCY OF CRlIBRIlTION CRLIBRRTION COMPRRISON IIIITH C£RTIFlCIlTES U£SCRIPTION OF THE CRLIBRRTIOM PROCESS 1I0RlCIH6 STRNDRRD CONDITIONS RCCURIlCY NRTIONAl STRNDIlRO OF CIlLIBRIlTION

Argentina SiAP, SI'lN, Negretti & Zambra, ±. 0.05 hPa ±,O.lhPa Every 2. years y" Calibration chamber ~ith vacuum pump Meteorologia Argentina and compressor

Australia Various manufacturers, ±. 0.1 hPa (short termstab) ±. 0.1 hPa/min, ±,lK/h ±. 0.15 hPa Weekly . On reQuest Calibration chamber Ke~ station type only Negretti & Zambra, Digital ScreOl piston chamber. Pressure is varied by screwing piston in/out Vaisala, I'lod. PAll Screw piston chamber Pressure transducer

Ilustria Fuess, Kroneis, Lambrecht ±. 0.1 hPa constant over 10 minutes ! 0.1 hPa ~orking stondard Pressure test bench identical ~ith natio~ nal standard

Bangladesh Darton & Co., Mod. MKII ±D.1...! 0.25 hPa ! 0.1.. .0.25 hPa y" y" Pressure chamber

Benin Societe Precis Mecanique ±0,D3hPa ±. 0.3 hPa Every 2 years Comparison in field by means of 2 '0 portable barometers

Botsl£lana Precis tlecaniQue. Casella ±D.1ll hPa I'lonthly y" 50 readings, divided in several sessions, over 2 days w ~ I Bulgaria USSR, Type KR ±. 0.3 hPa ! 0.5 hPa/h 5" years y" USSR, Type SR-A iD.3hPa USSR, Type SR-B USSR, Type IR ±0.2 hPi> Inspectors barometer 6UR, Type HI

Chile Fuess, Type l1b ±. 0.4 hPa ! 0.3 hPa No Barometric chamber, Friedrichs, Lambrecht, I'lod. 510 '0 Type 8700. Pressure increasing and Thies, tlod. 3.1550.17.000 decrei>sing. Vaisala, Portable barometer. I'\od PR-21 , Digital readont ruess, Type 11a

China Chal1(jchun Factory, China ± 0.3 hPa Every 5 years y" I'lax. 3 barometers and the standard baro- Adjustable cistern barometer meter are placed in a special cabinet. Fixed cistern barometer 10 sets of comparative readings over 3...5 days.

[olambia Thies 98 ~ ? 95 % ? 95 -% ? Fuess oressure chamber

Green. I'lod. 110 mE OF IN.STRUIIENT: BRROIlETERS

COUNTRY tlHNUFACTURERfllODEl RCCURHCY OF CONSTRNC';' Of CALIBRATlI»l CALIBRRTIllN COIlPARISllN IiIITH CERTIFICHTES DESCRIPTION OF THE CRLlBRflTION PROCESS UORKING STANllRRD CONDITIONS ACCURACY NRTIONRl STRNDRRD OF CRLIBRATIO~

Cote d'Ivoire Prec~s mecanique ±. 0.03 % ±. 0.03 % Every 2 years N, (?)

Cyprus Casella, Kew pattern barometer ! 0.1 hPa ±. 0.1 hPa N, y" Pressure chamber Negretti &: Zambra

Czechoslovakia Fuess, TGli Ilmenau ±. 0.005" Torr Every 3 years y" Pressure chilmber

Egypt Fuess ±.O.01hPil ±. 0.05 hPa ±.O.01hPa Every 3 years y" Pressure chamber

Ethiopi.a Muller, Mod. 1169 ±'O.l mm Hg ±'O.lmmHg No y" Pressure chamber

France ± 0.01 % ± 0.1 hPa y" Pressure chamber ±. 0.05" hPa

lJaisala, Barometer for Automatic Weather stations w w Gabun Precis mecanique ±O,3hPa Last comparison No TllIO transfer standards in 1987 lierman Demon. \lED Technisches Glas Ilmenau, 1. ± 0.2 hPa ± 0.1 hPafmin ± 0.3 hPa Every 2 years y" Special barometer examination Republic GOR, Fixed cistern barometer equipment

2. ±0.2hPa

Germany. Muller, tiarine barOffillter to.lhPa ±. 0.1 hila to.5 hPa Every 1-2 years Y" Air conditioning cabinet Fed.Reo. of Type 15 m ti~ller, Type 610 (OIN 8896) ± 0.05" hPa .±. 0.1 hPa ±0.1 hPa Lambrecht Fuess, Mod. Bag

Greece Fuess, Mod. lla-g 3elfort, Mod. 607g-1 ±. 0.1 hllil No No Friedrichs. Rezipient. Mod. FR 700 Lambrecht. Mod. KG 61

(luEer, Mod. Hag TYPE OF HISTRUI1ENT: BAROMETERS

COUNTRY MANUFACTURER/MOO EL PRINCIPLE OF MEASUREMENT LIMITS OF CALIBRATION RANGE OF NUMBER OF TYPE OF 1I0R:l::ING STANDARD OpERATION RRNGE ERROR INTERVflL CflL~BRATION CAL.POIlHS fjon~ Kong Darton, Kewpattern nercury 870 ..1100 hPa ± 0.2 hPa 1 year 1000 ..1025 hPa 10, ..25 NegretE &. Zambra, Ke"l-Pattern Gauge, 1950 Setra, Digital Barometer Capacity 800 ..1100 hPa ±0.3hPa 2 years 1000 •. 1025 hPa 10 ..25 \

Hungary Fuess/GOR/Poland Mercury 690 ...B20 mm fig ±O.l mm fig 990 ...10BO hPa Fuess barometer, Type liIF

Nigeria Casella, Ke~pattern baroleter rlercw-y 7BO ...1000 hPa i 0.4 hra 4 years BOO .•.1010 hPa intervals of 10 hPa

• TYPE OF INSTRUMEUT: BAROMETERS

COUNTRY MANUFACTURER/MonEL ACCURACY OF CONSTANCY OF CALIBRRTlOK CRLIBRATIllN COMPARISON 'lIlTH CERTIFICATES DESCRIPTION OF THE CRLIBRATION PROCESS 'lIORKINEi STAIWARO CONOITIONS RCCURACY tlATIONAL STANDARD OF CALIBRATION

Hong Kong Darton, KelJpattern ±O.17hPa 1 hPafh ± 0.37 hPa Every 10 years '0 Setra, Oigital Barometer

Hungary Fuess/GDRlPoland ±. 0.04111111 Hg ± 0.05 hPa Every 10 years (0111- rison of national standard and regional standard

India Keljl/Fortin-tVDe barometer .to.1hPa ± 0.1 hPa Every year Yes Pressure chamber

Indonesia Fuess, Mod, 11,2.9 Terra-Kahlsico, USA, Mod. MB-505

Jaoan Tokyo Suzuki, flod, MID ±033hPa ±'O.05hP'l Every :z years Yes Pressure chamber Fortin barometer Ota Keiki Seisakusho, Mod.No,5 ±. 0.33 hPa ±1 ...3 hra

Jordan Lambrecht, Mod. 510 No Yes Friedrichs, RezipienL Md. F~ 7DQ w '" Kenia Ne~retti a' Zambia, Mod. 2236~, ±. D,D1 mm Hg ±'D.lmmHg ±.0.05hPa No Yes 110d. 19m

Mongoli.a USSR, Mod, MH·9 USSR, Mod, SR-R

Nell Zealand Negretti & lambra, :: 0.22 hPa (95% CLl ±. 0.01 hPa Digit'll display + WC±, 2K ±,O.2 nPa {gg% eLl Every 10 years Yes Darton, N& Z, Short &: Mason :: 0.2 hPa (95;: CLl ±. 0.02 hP'l ±. 0.2 K to.2 hPa (99% CLl Pressure cn'lmber KGO Instruments Ltd. Lat!.· Refer to KewPattern b. Lab.: ±,0.2 hPa(gr;% CLl Every 10 years Yes I_at!.· PressurefTemperature chamber Mod. RCT 30& Transducer Field:±' 0.3 hPa (95% CLl Field:±0.4 hPa(95% CLl Pressure caEll-ration at 0"C,+20"L HO°C Field 'Hand operated peristaltic pump to vary Dressures

Ni~eri.a Casella, Kewpattern ~arometer Every 5 years No Pressure chambec, ~riedrichs • mE OF HiSTlUIlENT: BRROI1ETE~S

CO~TlY I1RNUFflCTURER/1100El RCCUlIIlCY OF CONSTRNCY Of CRLIIlRRTION CALIBRIHHlN COI1I'RRISON IHTfi CERTIFICATES DESCRIPTION OF THE CRLIilRRTION PROCESS ~ORKIN6 STRNOIlRD COHllITlOIlS ACCURRCY NATIONRL STANDRRD OF CALIBRATION

Norway Milller IFuess, Mod. Hag Hass:±. 0.015 ~ f .s. ±. 0.2 hPa ±0.1 hPa Before a series of cali.bration yO' Wegretti & Zalllbra, Type M2235 Parascientific, USR, Mod. 215 Alrl Fuess, Mod 15psh (at ship stations)

Wouvelle Caledonie Precis mecanique ±. 0.32 hPa (g5~ CLl ±. lJ.1 hPa Every 10 years 60 measures during 2: days

~akistan Negretti & Zambra, Darton, Fuess ±. 0.03 hPa Every 2: years Comparison of barometer under test ,md Fortin & Kew pattern standard during rise and fall of pressure T-Wheeler, Wa z, Short & Mason

Philippines US Weather bureau ± 0.01 hPa ± 0.02 hPa yO' yO' Fortin type

Poland Spoldzielnis Pracy P5 Barometer ± 0.2 hPa ± 0,2 hPa Pressure chamber nanometer ±0.3 hPa w " Polynesie Precis lIIecanique ±0.15 hPa ±0.15 hPa Every 10 years N, 50 comparisons at different pressures Francaise Mod. P03-104oA cOHlparison OIith Reg. standard

Pl'lrtugal Fuess, Mod. !lag ± 0.1 hPa ±o.lhpa yO' yO' SiAP, Mod. PH 33

Quatar Neqretti & Zalltbra, Mod. l'lK2 N' N, Connection to a pressure ch.amber throuqh a tube

R!public of Korea Weather Measure lJIeathertronics, ±. 0.u5 hPa Every year Ye> USH, Fortin type Yanagi, Japan Friedrichs, £B-2, Electronic barom~ter

Sudan Casella, Mark II. Ke~ type ±0,2 hPa ±. 0.2 hPa N, N, Direct comparison of standard and baro- meter under test

TWE OF INSTRUMENT: BAROnETERS

COUNTRi' MRNUFRCTURER/MOO EL RCCURRCY OF CtmSTAh'tY OF C1\LlRRRTION CRLIHRflTION COMPflRISON ,mH CERTIFICRTES DESCRIPTION OF THE CRLIBRRTION PROCESS IlORI:ING STANDRRD CONDITIONS ACCURACY NRTlONflL STANDARII OF CRLIBRRTHlN

SlJeden SMHI + 0.02: hPa ±O.05hPa ±. 0.1 hPa Every year No Pressure/temperature chamber Setra, Mod. 270 ±0.02 hPa ±'O.05hPa ±,O.lhPa Pr~ssure set by RIJ5tR in a closed systH Fuess, flod, 15PM

SlJitzerland Meteolabor RG, Type RSTR L ± o.om}3 in Hg ± 0.012% ± 0.2 hPa No No

Type GB-l 2. ±0,056 hPa ± D.054 hPa/a

Thaihnd !.ilmbrecht, Mod. olD ±0,3 hPa ±0.3 hPa Every 'Z years COlllDaratlve ,eaG ngs in abmspherir. aressure

The Netherlands Van Doorn, nod, KNrtI ±0,05 bPa i 0,01 hPa 1. ±0.05 hPa Connection to a pressure stabile tank (1,8 m3 ) FIJess!Muller, !'lad. 15 pm 2.±0.1hPa

Negretti &: Zamora, Mod MKl + MK2

Tunisie Preds mecaniQue, ±. C.15 hPa CaTI'paritive readings in pre"sur~ ?+.moSjJhere Lambrecht, FlJess w '" United Kingdom Negretti, Mod. flU & 2. ±0.015 %of reading or ± O.OG4 % FS ± 0.1 hPa Every 2. years y" f! Druck Digital Precision Pressure ± O.'J27 % FS Cal i.brator ':.s us'Oc Rosemount ,Pressure Transducer, No Mod. 1201 FlR + 1201 FIB

Unlted states II & Z, Transfer Standard, ±O.O1 % FS ±0.0005 in Hq u.i. ..1.0 % Every 6 months Yes See olJestionflaire of America Mod. M22:368 (FS = 0...1Q6D hPa)

Wallace & Tiernau, Transfer Standard, Mod. FR185 r,allsman, f!irmeter Setting Indicator, Mod. 1190 Kallsman, Station Barometer, Mod. 1130+1.622028 RIR, Dig. Electr. Barometer! Rltometer. Mod. AtHE -If! AIR, Hand-Held Dig. Barometer. Mod. RIR-HB-If! Setra, Rnalo~ Pressure Transduce~, Mod. 27!) 8elfod, l'larine Barometer. Mod. Gun Pr inco Instrument. Mod. 453 IYPE OF JNS1RIJI1EN.l:._~R~9_~(LElI.~.

COUNTRY ~RN[jFACTUkER/il(iU EL PRINCIPLE OF iltFiSURtl1ENT LII1IT5 OF CAlIBRATION RANGE OF NUl'IBER OF TYPE OF ~ORt:::lN6 STRNOFIRO OPEkATIGIl RANGE ERRGR INTtRi;JFlL CflLIBRRTION CAL.POINTS

Uruqu~'J H. r,re~p. Mercury 740 . ,1080 hPa ±. 0.2. hPa 97D ..10110 hPa Friedrichs, I1HturV Barometer, Mod. 11i PTE Sian Mercury 450 .. .71]0 i1i1li Hq iD.2li1mHg 730 ..78a fIPa. Fuess Mercury SOG ,.10SiJ hPa ± 0.2 hPa 970 ...lD4D hPc; 8enu'ex-Friez Aneroid 9S0 ..1060 hPa ±0.5 hPci 970. ,.10411 hPa /

Yuqoslavi? Larnbnkht +FIJe'ss + GDR ~ercury 945 ..1040 hPa ±0.3 hPa 2. years tambrecht +Fuess ,. GDR AneroLd 1.l45 ..1040 hPa p hPi! 11 Fuess, l'Iercury Barollieter, 1950

~ - 41 - ~ s ~ ~" 5 " :;!

~ ~ ] " ~ ", ~ '"e.

~" ~ ~ s ~ ~ ~ ~ 15 :" ~

~i -1= ~~ 1 ~ ~

~ ~ ~ i dO

. i~ = ~e ..., lOa! .,

i5 l!; ~:i i!!", :;;i ~B

.~ . oj " ~ " ~ j

'" ~ ~ ~ ] . 1 t ! I ~ ~ ~ ~ ~ i ~ :g . ~ ~ ~ ;g ~ ~ ~ § ~ ;e TYPE 01' INsTRUnENT: HflRO&RRP-HS

COUNTRY IlRNUFRCTlJRER/nODEL PRINCIPLE OF IlEASUREIlENT pm& 9' CALIBRIlTIQM RRH6E OF NUtlllER OF TYPE OF ¥ORKINIi STANDARD OPERRTION 'RH&f f"1lil IYTER~lll CALIBRATION CRL.I'OINTS

RrqenHna SiRP I!eteoroloqica Brqenti~a, Set of aneroid 3-?O ...10aO hP~ .., years 8...12 Mercury Barometer, Neqretti &: latabra, Santos Za~hi, Hessieo capsules 1938 mE OF IN.STRIJI1ENT: BRR06RflPHS

COUNTRY I1RNUFACTURER/MODEL RCCURRCY ,OF CONSTRNCY OF OILIBRRTION CRLIBRRTION CO"PRRISON lITH CERTIFICRTES DESCRIPTION OF THE CRLIBRRTION PROCESS 10RKlNG STRNDARD CONDITIONS RCCURRCY NRTIONRl STRHDRRD OF CALIBRATION

Argentina SiRP, Meteorologica Argentina, ±0.05" hPa ±0.1 hPa Every 2 years Y" Calibration chamber, change of pressure Santos Zaghi. Hessico by !leans of a pump or compressor. Comparative readings every 20 ...30 hPa

Australia Short & Mason, i 0.1 hPa (short ten!!) i 0.1 hPa/,in ±. 0.15 hPa RA 5" standard: Y" Barographs placed in pressure chamber. Negrettt & Zambra weekly Precision aneroid connected to chamber. Chamber evacuated

Bulgaria USSR, Mod. M22 ±'O.3hPa ,,, em, Mod. METRR

ChLle BeIfort, Micro-Barograph, iO.4hPa ±O.4hPa nod. 15-800 Lambrecht, Micro-Barograph Mod. 298 Friez, Micro-Barograph, Mod, 78m

Colombia Lambrecht, Micro-Barograph, , Mod, 293 ... '"' Cyprus Casella ±0,1 hPa ± 0.1 hPa PreSsure challlber

Geman Democr, IJE8 Feingeratebau, Drebach. iO.2hPa ± 0.1 hPafllin i 0.15 hPa Every 2 years Pressure challber Republic Mod. 205"

Germany, Dr. Muller, Standard Barograph, ±0.1 hPa i 0.1 hPa ± 0.5 hPa 1. ..2 years Y" Calibration in air conditioned cabinet Fed, Rep, of Type 78a Dr. MUller, Mod. 7&a ±O.04hPa ± 0.01 hPa i 0.05 hPa Every 5 years No Pressure cailinet

Greece BeIfort, Mou. 790-1 ±. 0.1 hPa No No Rezipient FR 700, Friedrichs, ffamburg Microbarograph Friez, !'lod, !'lL-3 Microbarograph Belf-ort, !'lod 5"-BOO R

Indonesia Fuess, tlod, 78,2 Pressure chamber Casella, tlod, li,I 2500/2 Belfort, Mod. 5-BO!J A

Mongolia USSR, Mod. n- 22 TYPE OF INST&UMENT: BAR06RArHS

COU~T~Y MftNUFACTURERJMODEL PRINCIPLE OF MERSUREMENT UnITS OF CftUBRBHON RRHllE IlF NUMBER I)F TYPE OF WORKING STANDARD O~ERRTIO~ RR~~E ER~OR INTERVAL tRLIBRRTIO~ CRL.POINTS

Nell Zealand Casel1~, Uartqn, snort a Mil~On, R~eroid 950 ...1050 hPa ±. 2 hPa Not regularly 11 Aneroid capsule/micrometer readout Open Scale Barograph Negretti a Zambra, Aneroid 950 ...1050 ~Pa ±. 2 hPa tlartne Qpen Scal~ Barograllh

PakLsian NwetH ll: Zampra Aneroid .1:. 1.5" hPa 2 years 5" ...11 Fuess, Fortin oarometer, 195&

Phllippinf;s Helfort, Microoarograph Aneroid 1. .•2 Yl1ars 920 ...1021] hPa

Pol~nd 5poldzielnia Pracy ~SZ Aneroid Z years 960 ...1060 hPa , USSR. Mercury barometer Zootechnika, Type TB20

Portugal Fuess, Mod. 7&b &35 ... 10~0 hPa ±. 1 hPi! 5 years 900 ...1030 hpa , Negretti & Zamora, Standard Test SiHP PR45"[IO Barometer, Mod. M2280, 1962

5\!1eden Ota Keiki, ~od, 69 Aneroid 950 ..10~q liP? ±. 0,3 hPa 1...2 y!"ars 95D .. .1050 liPa 3 or more Ruska, DOR 60ao~862~1100, 1978

I The Netherlands Fuess~~ijller, Normal barQqr:lPh AnerQid with 9S0 ... 10~q liPa ±'O.lhPa 2 year~ 950 ...1050 hPa 22 Kill1i, Standard barometer 1845. temp. compensation + Fuess nod. ZK, Mod. 20K Cistern b. t

United States of Belfprt. ni~robaroqraph 28.~ .. .:n.D in ~g Not reqlJ~arlY Depending on Every 25 hPa Ha$"$" , Type AI. Mercurial Precision Ameri~a (5 ranges) location Of use Standard Barometer, Isn

Uruguay Belfort Rneroi.d 965 ...1050 liBa :t .0.5 hPa 4 years 970 ...t1l40 hP

COUNTRY MRNUFRCTURElI:/MODEl RCCUT/RCr OF CONSTIIMCY OF CRUBRRTION CRLIBRRTlON ConPRRISON WITM CERTIFIanES DESCRIPTION OF THE CRlIBRRTION PROCESS "ORKING STRMDRRD CONIlITlONS RCCURRCY NRTlONRl STRNDRRD OF CfILIBRRTION

New Zealand Casella, Darton, Short :l Mason, ±. 0.3 hPa ! 0.4 hPa Every 10 years Ye; Pressure chamber Open Scale Barngraph Negretti :l Za'llbra, Marine Open Scale Barogr

Pakistan Negretti :l Z

Philippines DeHort. l'licrobarograph i 0.01 hPa iO.OZIIPa Ye; Ye; Calibration chamber

Pol

Portugal Fuess, Mod. 78b i 0.07 hPa i 1J.1 IIPa ±. 0.1 IIPa Ye; Ye; Calibration in air pressure controlled SiRP PR4S00 cabinett

Sweden Ota Keib, nod. 5B iO.02hPa .± 0.05 hPa i 0.1 hPa Every year No Pressure set by RUSKR 6000 in a closed system

The Netherlands Fuess-MUller, Normal barogr

Uruguay Delfort ±O.lI1Pa Friedrichs, Calibration chamber

SiAP Lambrecht IYPE OF lMSTRUmr ~ 'UfO SPEED: caUIIIRY UWUFACIURER/'OllE~ PRIIICIPl.E OF IUSURElQI l.IIlIS tlF CAI.IBRATI~K RAIIGE OF WIBER OF TYPE tlF 'ORUIIG SIAMllARD OPWTIOII RAllGE ERROR IITERVAL eALIBRtr.nOl CAL.POIRIS

Australia lunro !lines Anemograph nines Pressure Tube 11 ...911 Kt .:!:. 1 Kt Not regularly From 0 to £Ull Intervals of R & Z, later lanolleter 0...130 Kt scale 10 Kt 1l ...lBO Kt

Austria C" 0....30 lis 1 year 0.. .40 mls I' Ral-preSSure-llanolleter

BUlgaria USSR, lod. IS 13 0..... 20 lis 2 years 0... 20 lIs 10 USSR, lod. UPAR, 1961

USSR, lod. I 47 Selsyn Tacho 1.5 ... 50 lis 2 years 1. ..30 Ills I' USSR, lod. II 49 Selsyn Tacho 1.5 ..50 lis 2 years 1. .30 Ills I' Fuess, lod. B2a Pneul,a.tic 1 . .40 lis .:!:. 1 lIs 3 years 1. .. SO mls I' CSSR, lod. IIETRA m Pneu.atic 1. .. All lIs .:!:. 1 lIs 3 years 1. ..30 mls I' GDR, Junkaler Pneulatic 1. .. .411 lIs .:!:. I lis 3 years 1.. .30 mls I' Fuess, 90z Tacho 1.... .40 lis .:!:. 1 lis 3 years 1. ..30 mls I'

Chile Vaisala, lod. VAll Optoelectronie O. ..751/5? .:!:.O.ltls Fuess, 1I0d. 94cz O....80 it .!.0.51/s (?l Bendix-Friez, lod. 120 0....120 Kt .:!:. 1 % Belfort, 1I0d. 6052 0....60 Kt .:!:. 0.5 lis

China Shanghai Factory 1.. ..40 vs .:!:. 0.5 als 5 years o . .40 mls 8 Standard Pitot-static Tube ...I Czechoslovakia IE:TRA + Fuess + Vaisala + 0.5. 2 lIs 4 years 0 ..201/s+ Prandtl Tube, 1956 '" Lambrecht + Ynung 15 .. .40 lIs

Egypt Knntn, lod. III l24 0..... 60 Kt 3 years Intervals of 0.....90 It 5 It lierIJan [lelllcr. VE:B Anemol.eterbau, Dresden Cup II .... 30 lIs .:!:. 2.5 " 2 years O.•30 Ills 5 1. Prandtl Tube, Kod. 68, vith 1later Republ ic !land cup anelolleter, I{o 2 co IUlII! manometer Remnte indicate anemometer, C" 1.....60 Ills !. 1.5 l: 2 years O...30 Ills 5 2. Propeller anenolileter, lod. It 1011. 28/29 lechanical Anelnleter, lod. 16d C" 1.. ...50 lIs .:!:. 1 ,. 2 years 0...30 lis

Gerlany, Fuess, Ind. 90z C" .0 .....80 It .:!:.IKt 5 years 0...8n It 40 Prandtl Tube + Betz projection Fed. Rep. of manol.eter l.albrecht, 'oelfle type- C" Q.. ...40 lIs. .:!:. 0.6 lis 5 years Q•• AO lis Thies Cup 0..... 40 Jls .:!:. 0.6 lis 5 years 0~ . .40 Jls Thies C" ..40 Ills 5 years 0... 40 Ills 9 Pi tot Tube (Prandtll + Betz •• Kicro lIanollleter

!long Kong Teledyne Geoterh., Ind. IS-201 Cup t- photo chopper 0.....90115 !. 0.5D/s/!:. 2% I year 0...70 Ills 14 Eledrnnic counter, Fluke, Ind. B060A

Junra, Generatol' anelClleter, C" 0.....901/5 !. 0.5 ..1 als 1 year 0...70 lIs 14 lad. 'art 4B TYPE OF IIISTRUWT: IIIID SPEED

COUIITRT 1AI11FACTUR~IODEL .CC1IIlCI OF CCIS'lllCI OF ClLIBRAIIOI CJ.LIBRliIOI COIPARlSOI lITH CERTIFICATES DESCRIPTIOII OF TIlE CALIBRlTIOI PROCESS 1011116 STUDlIiil COIOlIlOlS iCCIliACI IIATIOILAI. STAlDWl OF CALlBRATIOI

Australia lunro Dines Anelograph ,:0.2 o H2 0 .!:. 0.5 It I• I,

Austria ±. 0.5 lis .!:.1 vs ! 0.5 •.!. 1 vs I, ,,, Open wind channel

Bulgaria USSR, lad. IS 13 ( 5 lis: .:!:. n.n5 lis ±. 0.3 lis Every 3 years ,,, 15l!s:!n.1 of, lISSR, lad. I 47 .:!:.0.31/s .!. 0.5 lis Every 3 years Y" USSR, lod. I -\9 Fues5, lad. lI2a C5SR, lad. IETRA 957 GDR., Junltaler Fuess, 90z

Chile Vaisala, iod. 'fA21 Fuess, Icd. 9~cz Bendix-Friez, lod. 12() Belfort, lod. 6052

I' China Shanghai Fadory .!. 1 % Every 5 years Y" lind tunnel and ritot-static Tube ~ I Czechoslovakia IETBA. t Fuess + Vaisala + ±. 1 lis Lalbrecht + Young .!. 0.5 lis Every 5 years Y" r,o dosed rind-tunnels

Etypt lIunro, lad. 11124 ..:!:. 1 ..1.5 lis .:!:. 1 It .!. 2....!. 3 It I, Y" Hydraulic pUllp

Ger.an Delocr. VEB !neloleterbau, Dresden 1. .!. 3 ,. (l 5 lis} .!.5% .!. 1/2 (O.5-0.05VJ See questionnaire Y" lind tunnel Republic Hand cu~ anelOleter, Jlo 2 Rellote indicate aueloleter, 2. .!. 1 ,. lIod. 28/29 lIechanical Anelueter, lad. lEd

Gerlany, Fuess, lod. 90z ! 0.1 lis + ..:!:. 0.5 lis !.U,. FS .:!:. 1 ,. FS I, Y" lind tunnel Fed. Rep. of Lallbrecht, Woelfle type Thies Thies .±. I " (above 5 lis) .!. 3 ,. Bi Closed circuit wind tunnel .:!:. 2 " Y"

Hong [ong Teledyne Geoterh .. lad. 15-201 .:!:. 0 05 ,. .!. 0.5 lis I. I. Ihe spindle of the anemometer is coupled to an electrical drill. The drill rotates lunro, Generator anellolleter, at different speeds. lod. lark 4B _ 48 -

.~ I•• " f 8

. .. ~~.~

. .. ~ ..' "- .-~ =~ - ~ ., ­., ., +1 "'1 +1 +1 +1"'10 .,

•

~!&:- -~­ ~~~ ...,j""; ... ~~.~~ co o· '"

. "",,,,,,a<,,,,, ~ ---.,;.,; .,; V"> t.<:I on ..,.,. ~ ~ ~ g;:gg;gg . =0·=~ ~ ~ i . . ~ i " " - 49 -

., ... 1"'1 .,

., .,

',' ., ., ., ., ., I I . " IYPE OF IISTRlTIEKl: mID SPEED

COUKlRY IAKUFACIURER'IODEl. PRIIlCIPl.E OF lEASUREq LIllIS OF CALI8RATIOII HAlliE OF ImISER OF TYPE OF 'ORIIIS STANDARD OPERATIOII RUSE ERROR INTERVAL CALIBRAIIOII CAl..POIIli'S

Republic of Korea Nippnn Electric, lod. !H4STB Prope ller ,. .60 Ills .:!'. 2 Ills 5 years Intervals of 5 IIIls Rippnn Electric, Ind. KS-30A C" 0.....60 I1s .:!'. 2 I1s

Sudan Ilunro, Ind. II 11 nines Pressure Tube 0....100 Kt !. 0.5 It 1 year o ..90 Kt , lanoi.eter

Sweden SIH! ,. .80 Kt !. 2 KW 20 Ktl 1 year 3...30 lis 5 licroaannlleter !. 10% {l 20 Ktl Vaisala, lod. IAA 15 0.....75 als !. 0.1 ./sU13 a/s} .:!'. 2% 010 Ills}

Switzerland leather leasure, lod ... 103 C" 0.9 ...50./s Schi ltknecht, Ind. 655-660 C,p O.4..AO Ills SiAP, lIountain Anelllometer, Pneumatic 2.. ...50 lis Druck, DPi 501, Pressure Controller lod. VT 1290 and Calibratnr

The Kether lands KNII C', ,.. .30 Ills !. 0.5 Ills 1 year 0... 20 mls 1. Pseudn standard: l.ambrecht, Vane " anellolleter, Mod. H05a Young, lod. B002 Propeller 2.5 ...54 Ills !. 0.2 Ills 9 months o ..20 m/s 2. Reference: An identical KNli " aneInl!leter g • United Kingdoll lIunro, lod. IHa, fHb C" ,.. .90 Kt !. 1 it!. 1%1 t 40 Ktl 1 year 0...80 it 9 1. Testovent 4000 cup fenerator, 1986 !. 2 it.t no 40 Ktl 2. lunro cup generator fHa, 1983 Vector Instruments, 0.3 ... 75 Ills !.2.%.t 0.1a1s 1 year 0.. AO Ills 9 3. lunro cup generator IK 1I; 1982. lod. PORTOI, nOOR, HOOR, AtOllS

Uruguay Electric Speed Indicator Cn O....100lt {?l Synchronous motor lith 500 and Iud. F~420-C 750 HPI

Yugoslavia" Fuess, l.aIbrecht, SiAP, Casella, 0.....6011I5 0.2 . .2..5./5 2. years Depending on the l.aIbrecht, Fuess, later Ianometer, 605T, 1. Stefan, Rose IlUller 1970

• TYPE OF mIRUIEPlT: lIPID SPE~D

COURTilI IAlfllFACIUREil/lODEL lCCUlUCY" OF COICSTlICY OF (.lURRlilOI ClLIRRITlOII COIPIRISOJ tITH CERTIFICITES DESCRIPTIO!l OF TilE CALIBR!TIOII PROCESS tORUl6 SIAlDliiD COIIDIIlOlS ACCURACY IIATION!L STlIDARD OF CALIBRITIOI

Republic of Korea Nippon Electric, lod. H~~~STB ~O.31/s .±. BJls Every year roo lind tunnel

Nippon Electric, lod. NS-m.

Sudan lunro, lod. 11K 11 ~ 0.5 It ~ 0.5 It No N.

Sweden SiHI ':'2% .:. 0.2 lIs .±. 0.4 Ills {( 20 Ills) N. N. lind tunnel .±. 0.5 Ills (J 20 lIs) Vaisala, lIod. IPA 15

S'fi tzerland leather leasure, lIod. I 103 .:. 0.5 Ills N. N. COI;{larison of the test anemometers in Schiltknecht, lIod. 65H60 stochastic turbulent wind, during e.g. SiAP, lountain Anelil.oIeter, : 0.05 hPa: 0.05 h/Paa passing frontal zones, by state of the lod. VI 1290 art se.pIing techniques

The Nether lands KNIl 1. 0.1 mls :0 .±. 0.1 mls Every year roo lind tunnel; 1. Comparison of the reference anemometer, which has to be Young, lIod. B002 calibrated with tbe pseudo standard

~ ~

United Kingdon lunro, lIod. 1K4a, lK4b 1. .±. 1% 10.4 ... 40 Its) .±. 1 % .±. 2 % N• lind tunnel 2.+3.±.I Kt ({ 40 Ktl Vector Instruments, .±.2Kt040Ktl lod. PORTON AlOOR, nOaH, HaaS

Uruguay Electric Speed Indicator Co. ,. roo lod. F-420-C

Yugoslavia Fuess, l.a.brecht, SiAP, Casella, .±. 0.1 sis roo lind tunnel EaST, I. Stefan, Rose Juller TYPE OF I1SIRUIENI: lIND DIREC!IOIf

CDUURY ....MUFACTURER/.ODEL PRIKCIPLE OF IEASUREIEIiT LIIITS OF ULIBRAIiON RAIGE OF "OlBER OF TYPE OF lORlING STAJm...RD QPERmOI UIGE ERRQR ImaVAL CUIBRinO! CAL.POINTS

Austr~l ia Innro a ..360· .t 2' Yearly checks I Pi tot Balloon Theodolite

Czechoslovakia lIetra, USSR, Fuess, Vaisala, ~ la' -4 years Young, l.a.brecht

Gerllany, Fuess, lIod. ~Oz Vane 0...360· t 4· 5 years Fed. Rep. of l.ambrecht, Woelfle type V"" O...360" t 10· S years ane.ograph Thies Vane 0...360· !:.lll" 5 years Thies, lIod. 4.3120 Vane 0...360· S years 0...360· 4 Prahctar

Hang (ang Teledyne Geotech Vane o ..360· t 3· (m 5'} I year 0...360· , Enbeero Compass Bearing, lonoclliar (lagnetic compass) Junro, Magslip transmitter II ...36ll· .:!:. 3· 1 year

Pakistan Pakistan leLDep. 6...366· 2 years • TIrE OF I1SYRUlEIT: lIND DIRECTIOIt

COUlHlU IAJIlFACYURER/IODEL ACCUtiC! OF COISiAICI OF ClLIBRATIOI CALIBRAtIOII COIPARlSOI Ill' CERTIFICATES DESCRIPIIOI OF THE ClLIBRATlOIi PROCESS IORIlll6 STilDlRD COIlDITIOIS ACCIlRACY KATIOKAL STAIDARO OF CALIBRATIOI

Australia Innra !. 0.2· !. 2.0· "" Czechoslovak.ia letra, USSR, Fness, Vaisala, Young, Lalbrecht

Gerlanj, fuess, lad. 90z Fed. Rell. of La.brecht, Woelfle tYlle aneugrallh Thies Thies, lod. 403120 !:. 0.5' !. I' The position of tbe vane is compared lith " " tbe protactor

Hong [ong teledyne Geotech !:. o.so !:. 3° 1. The wind vane is clamped. 2. The " " observation of the vane is read by an ob- lunro, lagslip translitter server using the lonocular. 3. Another teChnician adjusts the readout in a chart recorder.

Hungary Fuess, lod. B2a !:. 5' " Y" Long-term insitu comparison , w'" In.dia !:. 5' !:. 5° ...!:. HI' Y" lindvane checked for function and " dumping.

Japan Koshiu Denki Kogyo and others !:.I· !:. 2" Y" lad. [A-I01 and others " laroc Laulonier et Chauvin Arnoux, Use of calibrated resistors TAVIO BO, 610 2315 Jules Richard, lad. 192 D

Nell Zealand lunro, lod. III 205 !:. 3' !:. 3" llnits to he tested are substituted into a syste•. Synchrotach, Australia, !:. 8" !. 3" The unit under test is connected electri- lad. 721 " " cally to a calibrated direction indicator RIIICO, lad. RflDK and the vane correctly al igned at the cardinal points. Workshops Control of the potentiometer by turning the Van and plotting the poten- tiolleter voltage. Field: Alignement of the vane at 0" and 1BO' .

Pakistan Pakistan lIeLDep. ~5 .. ~100 Every 2 years ? Exposition on the top of the building and comparison Ilith the standard wind vane. TIPE OF IMsTRU'lEKT: II!I~ nJR~CTIO!C colJifIRY IARliFACTliRER/IODH PRIMCIPLE OF IEA5UREIEHI LIIlTS OF CALIBRATIOR RANGE OF NUIBER OF rIPE OF 'ORKING STAIID&RD DPERATIDIL ""''' ERROR IHT~VAL CALIBRATION CAL.POINTS

Poland USSR, lIod. 1147 o .. 360" .!. 10' Z years

Kepublic Of Korea Nippon Electric Instrililent o .. 360" .!. 5° 5 years 16 lod. jf-44 STB

Sudan Junro; lid. iK 11 V"", 0...3611" .!. Z" 1 year , Co,pass

The Nether lands Young, lIod; SOliZ Vane ll ...36110 ! O.So 9 tonths (I .••360" SOOIl Rotation stage

United Kingdoll Vector Instruments, M.od. 'ZIlQ 'fane lZ"!i 10' 0...360° 16 Gray COde Test Box

Jilnro, lod. III 205 Van!! 0...360· i 3" 1. ..3 years (I .•360° Analog Devices, Synchro Angle Position Indicator, lod. API 1620

...'"

• ~ r

n'PE OF rISUUIIUT: liD DlRECTtOl

COUlTlY IAlUFAC!URER/IODEL lCtURAtI or COISUICI Of CiLIIR.lIlOI ClLllR.lIlOI CUlPARISOl 1m CERtIFICATES D~IPTIOI OF rilE C&LIBRATION PROCESS 1OR1I16 SI!lDdll ClIIDllllllS ACCIlB!CI liUOIAL StAlDARD OF CALIBRATIOI

Poland USSR. lad. 147

Republic of Korea IIi Pilon Electric Instrulent, lIod. If-44 StB

Sudan lunro, IIcd. IK 11 .±. 2" .!. 2· Com.pass

The Rether lands Young, lod. tHI02 .!. 0.15' 0 .±. US' licro~colRputer controlled step motor drives a rotation stage with goniometer. Each step is 3GO/5000 : 0.114".

United Kingdom Vector InstruIents, Ind. 'zoO The Gray Code output is checked with an array of fOUf LEDs lunro, lad. II 205 .!. 0.02' .±. 3' Every 2 years N,

en en