Ampcontrol Pty Ltd
– ABN 28 000 915 542
GASGUARD CH4 GAS SENSOR USER MANUAL
GSB076 Version 6
– March/2019
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 14 of 25
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4.7 Electrical Installation Information
Electrical connections to the catalytic sensor are by means of a cable encapsulated into the sensor and
terminated with a cable mounted plug. The sensor plugs into the Amplifier electronics PCB (Connector
J4 within the sensor enclosure). The amplifier PCB is fitted with plug/screw connectors. This allows the
connector to be unplugged from the PCB to attach the wiring and then be plugged back into the board.
A second wiring assembly connects the supply and signal connections from the incoming terminals to
the Amplifier electronics PCB (Connector J5 within the sensor enclosure). Connector J5 is the
connection point for incoming cables. Figure 4.2 shows these electrical connections.
Figure 4.2: Electrical Connection Diagram
The loop resistance that the Gasguard Sensor’s analogue output can drive is limited by the input supply
voltage. This relationship is depicted in Figure 4.3.
Figure 4.3: Analogue Output Maximum Loop Resistance
Gasguard
65-6551
Sensor
Transmitter
1
2
3
4-20mA DC
-
+
0V
Signal
+V Supply
4
Maximum Loop Resistance at 20mA
0
100
200
300
400
500
600
9
10
11
12
13
14
15
Input Supply Voltage (V)
Ohms
