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MTL700 and 700P Series Shunt-Diode Safety Barriers

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MTL700 and 700P Series Shunt-Diode Safety Barriers MTL700 and 700P Series shunt-diode safety barriers Instruction Manual INM700 Contents Page 1 INTRODUCTION . 1 2 DESCRIPTION . 1 3 BARRIER SPECIFICATIONS . 1 3.1 The MTL700 and 700P Series . 1 3.2 General specifications . 2 3.3 Additional specifications . 2 3.4 Common specification . 3 3.5 Approvals . 5 3.6 Enclosure specifications . 6 4 SAFETY CONDITIONS . 6 4.1 General safety requirements . 6 4.2 Safety checks . 6 5 MOUNTING THE BARRIERS . (ENCLOSED SYSTEMS) . 6 5.1 Fitting the barriers into the enclosure . 7 5.2 Mounting the enclosure . 7 6 MOUNTING THE BARRIERS (UNENCLOSED SYSTEMS) . 9 6.1 The MTL700 and 700P Series accessories range . 9 6.2 Constructing the installation . 10 6.3 Using SMC7 surface mounting clips . 12 6.4 MK2 mounting kits . 12 6.5 MK5, MK12 and MK20 mounting kits . 12 7 WIRING INSTALLATION . 13 7.1 Glanding cables into enclosures . 13 7.2 Earthing the barriers . 13 7.3 Connecting non-hazardous (safe) area cables to barriers . 14 7.4 Connecting hazardous-area cables to barriers . 14 7.5 Cable parameters for MTL700 Series – BASEEFA(ATEX) & FM . 16 7.6 Entity concept parameters for MTL700 Series – FM . 17 7.8 Entity concept parameters for MTL700P Series – FM . 18 7.9 Final check . 19 8 MAINTENANCE . 19 8.1 Routine inspection . 19 9 FAULT-FINDING . 20 9.1 Power supply check . 20 9.2 Barrier resistance test (not MTL702, 705, 706, 707, 707P and 708) . 20 9.3 Earth faults . 20 9.4 Faults between barrier channels . 21 10 THERMOCOUPLE AND RTD TESTS . 21 10.1 Thermocouple circuit testing . 21 10.2 Resistance thermometer detector circuit testing . 21 continued overleaf © 2005 MTL Instruments Group plc. All rights reserved. INM700-10 June 2005 iii CONTENTS PAGE 11 BARRIER TESTS . 21 11.1 Multimeter tests . 22 11.2 Constant-current tests . 22 11.3 Tests for the MTL702 . 22 11.4 Tests for the MTL705 and 706 . 22 11.5 Tests for the MTL707 and 707P . 22 11.6 Tests for the MTL708 . 22 11.7 Test tables . 22 APPENDIX A: ATEX certification informATION . 27 © 2005 MTL Instruments Group plc. All rights reserved. INM700-10 June 2005 iv MTL700 & 700P SERIES INM700-10 SHUNT-DIODE SAFETY BARRIERS June 2005 MTL700 Series shunt-diode safety barriers 1 INTRODUCTION This instruction manual contains the information necessary to install, devices such as switches, thermocouples, resistive sensors, photocells maintain, fault-find and test MTL700 and MTL700P Series shunt-diode and LEDs, or separately certified ‘energy storing’ apparatus, for safety barriers. Section 4 of the manual contains a checklist which example ac sensors, transmitters and I/P converters. The barriers also highlights all the important safety factors that should be considered enable maintenance work or calibration to be carried out without when using MTL700 and 700P Series barriers to interface between further precautions, and they permit non-hazardous (safe) area non-hazardous (safe) and hazardous areas. All users should read this equipment to be worked on safely as and when necessary, with the section, and particularly the checklist, before commencing work on the minimum of restriction. barrier installation. A range of five polycarbonate enclosures is available to provide For further applicational information concerning the theory and use of environmental protection for barriers where required, and a Type N shunt-diode safety barriers, users are recommended to read the approved steel enclosure also is available to permit the barriers to be following MTL publications: installed in Zone 2 areas. Enclosures and other accessories are fully described in this manual. Application Note AN9003, A user’s guide to intrinsic safety; Application Note AN9007, A user’s guide to shunt-diode safety barriers (MTL700 Series); 3 BARRIER SPECIFICATIONS MTL Intrinsic safety catalogue covering MTL700 and 700P Series 3.1 The MTL700 and 700P Series barriers, and enclosures, parts & accessories; The series consists of a carefully tailored range of application-orientated CD700 customer drawings, for additional installation informa- models,.
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