9ENG8008 GFM436 User Manual
Calibrate low range point A calibration of the instrument at a low reading,
typically around 5% (different low rangers per gas).
This is done to improve the accuracy of readings at the
lower end of the possible range.
Calibrate high range point A calibration of the instrument at high reading, usually
dictated by the gas composition typically available.
To calibrate an instrument, the pump must be activated when connected to the correct gas source. Allow the
instrument to sample the gas for at least 3 minutes, then when the reading stabilises select “Calibrate” with the
middle soft key. This will change the deltas and overwrite the previous values.
Note: Ensure the correct gas concentration is connected to the instrument before calibrating. Miss-
calibrating will inevitably lead to false results. If anything goes wrong with the user calibration, reset the
factory deltas. Please contact the manufacturer for any further questions.
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