Page 37 of 48
Operating Manual
OMG100N Iss.02
© QED Environmental Systems Ltd.
User Calibration Trouble Shooting
A possible reason for this is because the instrument is trying to zero
to a level which is outside the predetermined range set when the unit
was calibrated at the factory or; the gas is not stable i.e. is still
flushing the measure gas or is using ambient air/gas that is varying in
concentration. To rectify this, first ensure the unit contains
absolutely none of the gas which is being zeroed by flushing
thoroughly with nitrogen. If it will not zero, then refer to the
instructions given in the ‘Factory Settings’ section. If the instrument
continues to fail to zero then the unit must be returned to the
manufacturer for investigation.
Check the span target is set to the correct value, if not, correct and
retry spanning the channel. Repeat the entire procedure, including
zeroing the channel and then calibrate the span. Ensure the reading
is stable before spanning the channel.
User Calibration Explained
Graph 1 - User calibration explained
User calibration is a means of optimising the performance of the instrument to the current operating
conditions such as ambient temperature and pressure as well as correcting for instrument drift
caused by lamp and filter settling.
In general, the instrument should not require calibration more than once a month, but we do
recommend verifying the instruments operation each day.
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