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 17 of 25
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Figure 5.1: Gasguard Sensor Control Panel
5.4 Zero Calibration
Perform a zero calibration as follows, noting that the gas must be flowing for the duration of the
operation:
a) Apply clean air to the sensor via the calibration hood and allow the reading to stabilise.
b) Place the magnetic tip of the calibration pen over the CAL symbol (1) for 5 seconds.
c) Now that the CAL mode is accessed place the magnetic tip over the ZERO symbol (3) for 5
seconds.
d) The display should have a zero reading. To save the zero setting place the magnetic tip over the
CAL symbol (1) for 5 seconds.
e) The sensor display (5) will show SAV to confirm that it has saved the zero setting.
f) Turn off the gas flow to the sensor
5.5 Span Calibration
Perform a span calibration as follows, noting that the gas must be flowing for the duration of the
operation:
a) Apply methane to the sensor at the rate of 0.5 to1 litre per minute and allow the reading to
stabilise.
b) If the reading lies outside the error limits given in the product specification, adjustment will be
necessary.
c) To adjust the sensor reading so that it reads the correct value for the applied methane
concentration, enter calibration mode by placing the magnetic tip of the Calibration pen over the
CAL symbol (1) for 5 seconds.
d) Place the magnetic tip of the pen over the UP symbol (4) to increase the display reading and over
the DOWN symbol (6) to decrease the display reading. Use these actions to set the reading to
the correct value.
e) To save the calibration value, place the magnetic tip over the CAL symbol (1) for 5 seconds.
f) Turn off the gas flow to the sensor.
