17
INM7700-6
Jan 2010
APPENDIX A: TYPICAL WIRING CONNECTIONS
FOR SPECIFIC APPLICATIONS.
Hazardous
Area
Safe
Area
3
4
1
2
250
W
4 -20mA
Power +26V
Signal
Power Bus
1-5V
M
Hazardous
Area
Safe
Area
3
4
1
2
M
250
Ω
1-5V
Power +26V
Power Bus
Figure A1:
2-wire transmitters
Hazardous
Area
Safe
Area
3
4
1
2
7
8
5
6
Power +26.6V
Power +26.6V
Logic signal
Logic signal
Power Bus
Figure A5:
2-channel switch inputs
Hazardous
Area
Safe
Area
3
4
1
2
MTL7756ac
Receiver
7
5
3
4
1
2
MTL7755ac
Receiver
Figure A6:
Low-level analogue inputs (RTD’s)
Figure A2:
2-wire transmitters with 250
Ω
conditioning
Hazardous
Area
Safe
Area
3
4
1
2
MTL7760ac
MTL7765ac
MTL7778ac
Recorder
Controller
Data logger
Computer
Compensating cable
Figure A3:
Thermocouple/mV input
Hazardous
Area
Safe
Area
3
4
1
2
MTL7743
MTL7744
7
8
5
6
Logic signal
Logic signal
Power
Figure A7:
2-channel switch/proximity input
Hazardous
Area
Safe
Area
3
4
1
2
MTL7742
5
6
Logic signal
Logic signal
Power Bus
+20V - 35V
0V
Figure A8:
Single channel switch/proximity input
Hazardous
Area
Safe
Area
3
4
1
2
M
Power +26.6V
Signal
Power Bus
Figure A4:
2-wire transmitter/switch input
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