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Page 15
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MAINTENANCE
D141-32-880 Issue A
5.3
Custom calibration (concentration units)
CAUTION
Do not bend the probes. The accuracy of the GasCheck G3 will be affected.
CAUTION
Do not pressurise the sample bag during calibration. Significant errors in the calibration will result.
Read the instructions below fully before calibrating the GasCheck G3. The following procedure should be followed if
the GasCheck G3 has been set to concentrations (ppm or mg/m3).
Table 4 - Calibration of the GasCheck G3 (concentration units)
Fill an empty (uncontaminated) sample bag with 5000ppm helium gas
before starting the calibration procedure. Also remove the outer grey
probe cover from the GasCheck G3.
Select the calibration procedure on the main menu (refer to
).
Select custom cal by using the or key to move the 'tick' to ' '
icon and press the key.
An option appears to allow different concentrations of helium tracer in
the test gas. The GasCheck G3 can accommodate concentrations
between 4900 and 5100ppm helium. Press the or keys to select
the correct concentration and press the key.
Ensure that the GasCheck G3 is in clean air and press the key. The
Instrument will take a few seconds to zero and then the 'Ready' screen
will appear.
Fully insert the probe into the sample bag and press the key. The
GasCheck G3 will sequence through the cold and hot stages of
calibration and will display a summary of values.
Press the key to return to the main calibration screen.Press the
key to start using the instrument or press the key to calibrate
again.