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Group Internet home page http://www.mtl-inst.com/

Members of The MTL Instruments Group

MTL Instruments Pty Limited

9 /12 Billabong Street
Stafford
Queensland 4053
Australia
Tel: + 61 1300 308 374  Fax: + 61 1300 308 463
E-mail: [email protected]

MTL Canada Safety Instrumentation

#102, 4249 97 Street
Edmonton, Alberta
Canada T6E 5Y7
Tel: +1 780 485 3132  Fax: +1 780 485 3122
E-mail: [email protected]

MTL Instruments China Co. Ltd.

Room 1002A, The Gateway
No 10 Yabao Road, Chaoyang District
Beijing 100020
China
Tel: +86 010 8562 5718/5720/5721  Fax: +86 010 8562 5725
E-mail: [email protected]

MTL Instruments sarl

Les Carrés du Parc
10 rue des Rosiéristes
69410 Champagne au Mont d’Or
France
Tel: +33 (0)4 78 64 98 32  Fax: +33 (0)4 78 35 79 41
E-mail: [email protected]

MTL Instruments GmbH

An der Gümpgesbrücke 17
D-41564 Kaarst
Germany
Tel: +49 (0)2131 718930  Fax: +49 (0)2131 7189333
E-mail: [email protected]

MTL India

No. 36, Nehru Street
Off Old Mahabalipuram Road
Sholinganallur
Chennai - 600 119
India
Tel: + 91 (0)44 24501660/24501857  Fax: + 91 (0)44 24501463
E-mail: [email protected]

MTL Italia srl

Via Cantù 11
I - 20092 Cinisello Balsamo MI
Italy
Tel: +39 (0)2 61802011  Fax: +39 (0)2 61294560
E-mail: [email protected]

MTL Instruments KK

MT Building 3F
2-7-5 Shiba Daimon
Minato-ku Tokyo
Japan 105-0012
Tel: +81 (0)3 6430 3128  Fax: +81 (0)3 6430 3129
E-mail:  [email protected]

MTL Instruments BV

MTL Instruments BV
Terheijdenseweg 465
4825BK  Breda
The Netherlands
Tel:  +31(0)76 7505360  Fax:  +31(0)76 7505370
 E-mail: [email protected]

Cooper Crouse-Hinds Pte Ltd

No.2 Serangoon North Avenue 5
#06-01 Fu Yu Building
Singapore 554911
Tel: +65 6 487 7887  Fax: +65 6 487 7997
E-mail: [email protected]

MTL Instruments

Villa No. 4, Sector 2-17, Street 6
PO Box 53234,
Abu Dhabi, UAE
Tel: +971 2 446 6840  Fax: +971 2 446 6841
E-mail: [email protected]

Measurement Technology Limited

Great Marlings, Butterfield, Luton, Beds
England  LU2 8DL
Tel: +44 (0)1582 723633  Fax: +44 (0)1582 422283
E-mail: [email protected]

MTL Incorporated

3413 N. Sam Houston Parkway W.
Suite 210
Houston  TX 77086
USA
Tel: +1 281 571 8065  Fax: +1 281 571 8069
E-mail: [email protected]

www.calcert.com

[email protected]

1.888.610.7664

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Summary of Contents for MTL770 Series

Page 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...

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

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

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