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Instruction Manual

INM7700

MTL7700 Series
Shunt-diode safety barriers

www.calcert.com

1.888.610.7664

Содержание MTL770 Series

Страница 1: ...Instruction Manual INM7700 MTL7700 Series Shunt diode safety barriers www calcert com sales calcert com 1 888 610 7664 0 5 10 15 20 25 30...

Страница 2: ...ii INM7700 6 Jan 2010 www calcert com sales calcert com 1 888 610 7664 0 5 10 15 20 25 30...

Страница 3: ...h 7 5 4 Connections to dummy barriers 9 6 MAINTENANCE 9 6 1 General 9 6 2 Routine inspection 9 7 FAULT FINDING 10 7 1 Introduction 10 7 2 Power supply check 11 7 3 Barrier resistance test 11 8 EQUIPME...

Страница 4: ...INM7700 6 Jan 2010 iv www calcert com sales calcert com 1 888 610 7664 0 5 10 15 20 25 30...

Страница 5: ...are available either from the company website www mtl inst com or on request from your local MTL office 2 DESCRIPTION 2 1 Introduction MTL7700 Series fourth generation intrinsically safe shunt diode s...

Страница 6: ...ers for marking barrier locations Supplied with labels in 1m lengths for cutting to size TGL7700 Spare labels for use with TAG57 tagging strips 0 5m strips supplied in sets of 10 IMB57 Tagging strip s...

Страница 7: ...en length of DIN rail allow space length for a Barrier packing pitch 12 6mm b ETL7000 earth terminals 10mm each minimum of two c IMB57 tagging strip support 16 0mm minimum of if specified two d ISP700...

Страница 8: ...recommendations contained in the relevant sections of IEC 60079 14 for the gas group temperature classification and area classification required 2 4 1 6 2 Make sure the barriers are of the correct typ...

Страница 9: ...end of a column of barriers to provide redundancy and to simplify earth testing procedures WARNING Apart from rare occasions when the mounting surface carries the IS earth the ONLY method of providin...

Страница 10: ...bly figure 12 identifies the location of individual barriers ensuring that they are replaced correctly after removal for maintenance or testing Once installed the tagging strip pivots upwards to provi...

Страница 11: ...vidual barriers and applications 5 2 3 Bussed Power applications and connections When a number of barriers use a common power supply the optional power link BPL7700 can be used Typical applications in...

Страница 12: ...or normally copper wire with a cross sectional area of at least 4mm2 12AWG must be connected between ETM7 earth terminals located at each end of the rail and the spare terminals on the ETL7000 termina...

Страница 13: ...educes interference problems but is not essential for safety reasons f In general the use of barriers in all measurement leads reduces the possibility of earth circulating currents causing measurement...

Страница 14: ...ck However when fault finding is necessary it must only be undertaken after checking with plant personnel responsible for safety that it is safe to proceed The fault finding procedures described in th...

Страница 15: ...by using an MTL7760ac barrier as shown in figure 21 This permits the thermocouple output to be measured without needing special authorisation to use uncertified thermocouple test equipment As it is se...

Страница 16: ...rehensive testing requires specialised equipment beyond the scope of on site tests However an effective test which will confirm that the unit is operating correctly is shown in figure 24 Ammeter 1 mea...

Страница 17: ...he output contacts according to Table 3 3 4 1 2 MTL7742 5 6 7 8 Bussed Power 24V Vs Vs 2K Figure 27 Test circuit for MTL7742 3 4 1 2 MTL7745 5 6 620W 10kW 24V Bussed Power Line Fault Output Vs Vs Figu...

Страница 18: ...e the expected reading across the diode chain can be determined BARRIER DATA MULTIMETER TESTS CONSTANT CURRENT TESTS MTL Safety End to end Diode Diode Terminal Terminal model Description Resistance Te...

Страница 19: ...7 Dual channel ac barriers BARRIER DATA MULTIMETER TESTS CONSTANT CURRENT TESTS MTL Safety End to end Diode Diode Terminal Terminal model Description Resistance Test Test Voltage Voltage No ve ve 10 A...

Страница 20: ...fz x 2 26 6 27 4 26 7 27 6 7787 ch2 28 0 9V 26 Vfz x 2 26 6 27 4 26 7 27 6 7787P 28 237 119 241 253 Vfz x 3 26 4 27 4 26 5 27 6 7787P ch2 28 0 9V 26 Vfz x 2 26 6 27 4 26 7 27 6 7789 38 300 93 614 651...

Страница 21: ...ceiver Figure A6 Low level analogue inputs RTD s Figure A2 2 wire transmitters with 250 conditioning Hazardous Area Safe Area 3 4 1 2 MTL7760ac MTL7765ac MTL7778ac Recorder Controller Data logger Comp...

Страница 22: ...3 4 1 2 MTL7745 5 6 620 10k 22 9 30V LFD COM CH 1 Power Bus Figure A10 Single channel switch proximity input with Line Fault Detect Hazardous Area Safe Area 3 4 1 2 MTL7789 7 8 5 6 Power 26V Power 26V...

Страница 23: ...www calcert com sales calcert com 1 888 610 7664 0 5 10 15 20 25 30...

Страница 24: ...91 0 44 24501660 24501857 Fax 91 0 44 24501463 E mail sales mtlindia com MTL Italia srl Via Cant 11 I 20092 Cinisello Balsamo MI Italy Tel 39 0 2 61802011 Fax 39 0 2 61294560 E mail info mtl inst it M...