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 10 of 25
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3.2 Amplifier Electronics PCB
The purpose of the amplifier electronics is to convert the low-level electrical output of the sensor into a
signal capable of driving external indicator equipment such as the Ampcontrol Gasguard 4 Channel
Controller.
The Gasguard amplifier electronics are designed to operate as a 3-wire unit with connections provided
for input power, power supply return and current loop signal output.
The electronics require 12VDC operating voltage and transmits a signal in the range of 4 - 20mA. The
4mA signal level indicates a zero gas concentration. The 20mA signal indicates that the sensor cell has
detected a full span gas concentration.
ZERO
and
SPAN
adjustment reed relays located on the PCB are
used for calibration of the sensor.
3.3 Enclosures
Stainless Steel Housing
The standard Stainless Steel Housing, Item Number 23-6550LB, incorporates the Sensor Cell and
Amplifier PCB. The housing is robust and is corrosion resistant. It is suitable for almost all applications
and provides for easy installation and maintenance. When properly used it gives many years of efficient
operation.
Figure 3.1: Gasguard CH4 Sensor Stainless Steel Housing
