Ampcontrol Pty Ltd
– ABN 28 000 915 542
GG2 DETECTOR USER MANUAL
GG2B011 Version 3
– June/19
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 25 of 39
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5.3 Calibration Troubleshooting
If during calibration or zero of the GG2 Detector the status indicates a fault or the reading becomes
erratic then possible reasons are as follows:
5.3.1 Calibration Error
a) Check the calibration gas. It should be a correct range in air mixture although other trace gases
may be present. Lower percentage gas mixtures will reduce the output leading to unnecessary
change out of the sensor.
b) Check the gas flow to ensure it is 0.5 to 1.0 litres/min.
c) Check the surrounding airflow. If the ambient airflow is above 1.5 metres/second, it can dilute the
calibration gas. Use a shield or bag over the sensor if there is a high wind speed.
d) Check sensor is not blocked with dust or mud. The filter cage can be cleaned out with an
antistatic brush before re-attempting calibration.
5.3.2 Zero Error
The sensor zero balance is required to be within a pre-set level and if the sensor is damaged the zero
shift may take it outside the limit. Once this occurs an indication is shown when trying to zero the
instrument, and the sensor should be replaced.
If left in Cal mode the instrument will revert to normal mode after about 2 minutes, retaining its last
settings.
5.3.3 Erratic Readings
Check the calibration cup, gas cylinder and gas lines for leaks or improper flow regulation.
