·After zero point calibrating for all the sensors are succeeded, the symbol
for detection
pass will be displayed.
·If the zero point calibrating for one or more sensors is failed, the symbol
for detection
pass will also be displayed but with an "Err" indication for a failed channel.
Notice:
If there is any sensor failed, carry out the zero point calibrating again in clean air;
if it still fails, please contact us or the local agent for service.
4.2 Zero point calibrating (Sensitivity calibrating for O
2
, 0.0%vol)
For noxious gas sensors, the sensitivity calibrating should be carried out every 6
months. The user should apply a standard gas to sensor calibrating, and the detector will
identify automatically.
At sensitivity calibrating, the operator should apply the following calibrating tools:
·Standard gas cylinder(s) with known concentration
Gas type
Standard gas concentration recommended
Combustible Gas
CH4 60%LEL
·Flow meter (300mL/min recommended) and pressure relief valve
·Connecting pipe between the pressure relief valve and the calibrating case
Zero Point Calibration
Dectection Failed
