Dwyer MTL7787 - Manual (Page 21)

17 INM7700-6 Jan 2010
APPENDIX A: TYPICAL WIRING CONNECTIONS
FOR SPECIFIC APPLICATIONS.
Hazardous
Area Safe
Area
3
4 1
2
250W 4 -20mA
Power +26V
Signal
Power Bus
1-5V
MTL7706+
MTL7787+
MTL7787P+
MTL7788+
Hazardous
Area Safe
Area
3
4
1
2 MTL7788R+
250 Ω
1-5V
Power +26V
Power Bus
Figure A1: 2-wire transmitters
Hazardous
Area Safe
Area
3
4 1
2
MTL7789+ 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
MTL7787+
MTL7787P+
Power +26.6V
Signal
Power Bus
Figure A4: 2-wire transmitter/switch input