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Precision Glass Capillary Viscometers Viscosity Apparatus Certified

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Precision Glass Capillary Viscometers Viscosity Apparatus Certified Precision Glass Capillary Viscometers Viscosity Apparatus Certified Reference Materials Poulten Selfe & Lee has more than 70 years of experience in manufacturing the PSL Rheotek range of glass capillary viscometers. Instruments are used in laboratories throughout the world and enjoy a high reputation for quality of workmanship and accuracy of calibration. The PSL Rheotek range of products KINEMATIC VISCOSITY Glass capillary viscometers Viscometerbaths Chillers Digital thermometers Viscometer Cleaning System BITUMEN VISCOSITY Vacuum capillary viscometers Viscometer holder Bitumen vacuum system POLYMER VISCOSITY Polymerviscometers Automatedpolymerviscometers Samplepreparation Sampledissolution PULP VISCOSITY SCAN viscometers Visibility bath Pulp viscometer system VISCOSITY ACCESSORIES Viscometerholders Stopwatches Bench stand Operating kits Viscosity reference oils CONTENTS PSL Series Viscometer type Specification Introduction 4 Technical information 5 UBBELOHDE TYPES FOR TRANSPARENT LIQUIDS 1 625 Suspended Level BS/IP/SL 7 1 628 Suspended Level, Shortened Form BS/IP/SL(S) 8 1 631 Miniature Suspended Level BS/IP/MSL 7 1 643 ASTM Ubbelohde ASTM D446 11 1 647 Cannon-Ubbelohde ASTM D446 1 2 1 671 DIN Ubbelohde DIN 51 562 11 1 690 Master Ubbelohde ASTM D21 6 1 8 MODIFIED OSTWALD TYPES FOR TRANSPARENT LIQUIDS 1 61 9 U-Tube BS/U 6 1 622 Miniature U-Tube BS/U/M 6 1 634 Cannon-Fenske Routine ASTM D446 9 1 659 Cannon-Manning Semi-Micro ASTM D446 1 3 1 669 Pinkevitch GOST 33 1 4 REVERSE FLOW TYPES FOR TRANSPARENT AND OPAQUE LIQUIDS 1 637 U-Tube Reverse Flow BS/IP/RF 1 0 1 641 Cannon-Fenske Opaque ASTM D446 9 1 663 Zeitfuchs Cross-Arm ASTM D446 1 4 VACUUM TYPES FOR BITUMENS AND ASPHALTS 1 676 Cannon-Manning Vacuum Capillary ASTM D21 71 1 6 1 677 Asphalt Institute Vacuum Capillary ASTM D21 71 1 6 1 678 Modified Koppers Vacuum Capillary ASTM D21 71 1 7 POLYMERS & PULP 1 651 Cannon-Ubbelohde Dilution ASTM D446 1 2 1 655 Cannon-Ubbelohde Semi-Micro ASTM D446 1 3 1 675 Ubbelohde for polymers ISO 1 628 1 5 1 705 Ostwald ASTM D2857 1 5 1 71 0 Suspended-Level Dilution ASTM D2857 1 5 21000 SCANviscometersinjackets ISO 5351 1 9 MISCELLANEOUS VISCOMETERS 1 71 5 Falling Sphere viscometers BS1 88 1 9 1 725 Deoxyribonuclease Assay 1 9 VISCOMETER APPARATUS 20400 Viscometerbaths ASTM D445 21 1 800 Viscometer holders ASTM D445 22 20700 Bitumenvacuumsystem ASTM D21 71 1 7 2700 Viscosity oil standards ASTM D445 24 F100 Digitalthermometers ASTM D445 25 VOK Operating kits ASTM D446 20 1 61 2 Stopwatch ASTM D445 20 20440 ViscometerCleaningSystem 20 1 61 0 Pipettes ASTM D446 20 RP000 Chiller 23 20800 Pulpviscometersystem ISO 5351 23 20405 Siliconebathoil 23 CALIBRATION SERVICES CAL-T Digital thermometercalibration ISO 1 7025 26 RECAL Viscometerre-calibration ISO 1 7025 26 INTRODUCTION SCOPE PSL Rheotek glass capillary viscometers provide a relatively simple and accurate means of measuring the Kinematic Viscosity of a wide range of petroleum, polymer, pulp and pharmaceutical liquids as well as the viscosity of bitumens in vacuum capillary viscometers. Various international standards are available dealing with this subject, including those published by ISO, ASTM-IP, BSI and DIN, and detailed operating instructions can be found in these specifications. CONSTRUCTION PSL Rheotek viscometers are constructed from low-expansion borosilicate glass and the precision bore used for the capillary section is held to the close tolerance of +/- 0.01 mm. Viscometers are clearly marked with timing lines and other inscriptions as well as a unique serial number. Aglass bridge is provided to give additional strength and the finished instrument is fully annealed. CALIBRATION The PSL Calibration Laboratory is accredited to ISO 17025 by the United Kingdom Accreditation Service. Calibration is carried out by using reference instruments that have been directly calibrated against the master viscometer scale maintained at the laboratory. The primary standard is distilled water, which has the internationally accepted value of 1.0034 mm²/s at 20.00°C. CALIBRATION VALIDITY The viscometer calibration period is valid from the day of first use, irrespective of the calibration date of the viscometer. Once in service, the viscometer calibration data should be verified using PSL Certified Viscosity Reference oils. Calibration data may change due to a build-up of sample residue on the capillary or physical damage to the instrument. RE-CALIBRATION Viscometers can be re-calibrated by returning them to the PSL Calibration Laboratory. Instruments will be checked and repaired, if necessary, prior to re-calibration VISCOMETER APPARATUS PSL offers a range of viscometer apparatus, including viscometer baths, viscometer holders, bench stand, calibrated stop watches and viscometer operating kits. TEMPERATURE APPARATUS PSL is also accredited as a calibration laboratory for temperature measurement. Arange of precision digital thermometers are available with calibration meeting the accuracy requirements of viscosity test methods. VISCOSITY REFERENCE OILS PSL Rheotek Viscosity Reference Standards are suitable for use with a wide range of viscometers. Certified values are provided for a range of temperatures as well as kinematic viscosity, density and dynamic viscosity. 4 TECHNICAL GRAVITY CORRECTION If a viscometer is to be used where the gravity differs significantly from the PSL value of 9.812 m/s², a correction should be applied to the reported value ofC as follows: Cx = gx/9.81 2 · C (where gx is the local acceleration due to gravity expressed in m/s2). EFFECT OF TEMPERATURE The calibration constant, C, for all suspended-level types of viscometers is independent of temperature as well as those viscometers that have the volume of sample adjusted at the bath temperature. However, viscometer types that have a fixed volume charged at ambient temperature will have a viscometer constant that varies with the temperature of use. Refer to viscometer tables for further information. Equations to correct the constant C for different temperatures ofuse are provided in ISO 3105 orASTM D446 – IP71 Part 2. TEMPERATURE MEASURING DEVICE APSL Rheotek calibrated digital thermometer should be used to confirm the temperature. TEMPERATURE CONTROL BATH APSL Rheotek constant temperature bath with a suitable bath medium should be used for controlling the temperature of measurement. VISCOMETER ALIGNMENT Mount the viscometer in a PSL Rheotek viscometer holder. FLOW TIMES Measure flow times using a PSL Rheotek calibrated stop watch to the nearest 0.1s. MINIMUM FLOW TIMES Are stated for each type and size ofviscometer in this catalogue. The purpose ofthe minimum flow time is to ensure that a kinetic energy error does not arise. KINETIC ENERGY CORRECTIONS If minimum flow times are not observed, a significant error can arise for viscometers with a constant of 0.05 mm²/s² or less. Refer to ISO 3105 orASTM D446-IP71 Part 2 for further information. CALCULATION OF VISCOSITY If the minimum flow time has been met, calculate the determined viscosity values from the measured flow times (tn) and the viscometer constant C, by means ofthe following equation: νn = C ·tn. If the difference between the determined values meets the specified method precision (“determinability %”), calculate the kinematic viscosity result, ν, as the mean ofνn. PRECISION Various standard methods set out different precision requirements. However, the basic requirements can be defined as follows: (1) Determinability – the difference between two successive determined viscosities, ν1 and ν2. For transparent liquids, repeat flow times should be measured using the same timing bulb within a single viscometer. For opaque liquids, it is recommended that two viscometers (e.g. U-Tube Reverse Flow) are used side by side. (2) Repeatability – the difference between two calculated and reported results, generated by the same operator using the same apparatus. (3) Reproducibility – the difference between two calculated and reported results, generated by different operators in different laboratories using similar apparatus. UNCERTAINTIES Viscometers are calibrated in relation to a master scale, whereby the uncertainty of measurement increases with the order of the viscometer constant, C. Arange of uncertainties for direct flow viscometers and reverse flow viscometers are provided with certificates of calibration. 5 U-TUBE VISCOMETERS BS 188, ASTM D445-IP71, ISO 3104, ISO 17025 Type BS/U suitable for measuring transparent liquids. Nominal overall length 300mm. Approximate sample volume 13-40mL. Supplied complete with ISO 17025 certificate of calibration. PSL Size Nominal Kinematic Viscosity Part No. Constant, Range, mm2/s (cSt) mm2/s2 (cSt/s) 1 61 9/00 O 0.001 0.3 to 1 1 61 9/01 A 0.003 0.9 to 3 1 61 9/02 B 0.01 2.0 to 1 0 1 61 9/03 C 0.03 6 to 30 1 61 9/04 D 0.1 20 to 1 00 1 61 9/05 E 0.3 60 to 300 1 61 9/06 F 1 .0 200 to 1 ,000 1 61 9/07 G 3.0 600 to 3,000 1 61 9/08 H 1 0 2,000 to 10,000 Note: Requires constant volume at test temperature. As per ASTM D445/6 minimum flow times are 300s (size A), 200s for sizes B to H. Size O is a special size (BS188) and is not specified in ASTM D446-ISO 3105. Akinetic energy correction will be required for flow times of less than 1500s. For petroleum applications, the size 0 ASTM Ubbelohde (1643/01) is recommended. Requires long filling pipette (1610/01). MINIATURE U-TUBE VISCOMETERS BS 188, ASTM D445-IP71, ISO 3104, ISO 17025 Type BS/U/M suitable for measuring transparent liquids. Nominal overall length 250mm. Approximate sample volume 4mL. Supplied complete with ISO 17025 certificate of calibration. 6 SUSPENDED-LEVEL BS 188, ASTM D445-IP71, ISO 3104, ISO Type BS/IP/SL suitable for measuring transparent liquids. Nominal overall length 330mm. Approximate sample volume 22-40mL. Supplied complete with ISO 17025 certificate of calibration.
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