Gas Measurement Process – Best Practice
Depending on preferences the exact reading procedure can change.
The following method is considered best practice and when followed correctly will allow quick and
consistent readings to be recorded.
When the instrument is first switched on it should be purged with fresh air and allowed to
stabilise for a few minutes.
At this point it is good practice to verify the CO
2
channel. Calibrate only if required. This option
is available via the ‘Calibration’ menu. The instrument is now ready to take the first reading.
Connect the sample tube, if relevant (always use the sample filter) from the sample point to the
inlet port of the instrument, ensuring the filter is seated correctly.
Press the ‘Pump’ key to draw a sample into the instrument.
Notice the main gas readings start to change. It is recommended to run the pump until the gas
readings have stabilised (approx. 30 seconds) then press the soft-key ‘Store’.
The pump will stop and the operator will be prompted to enter an ID code to identify the
reading. A “reading stored” confirmation message will be displayed briefly before returning to
the ‘Main Read Screen’.
Note: The ID code prompt can be switched on or off. This option is accessed via the ‘Settings’
menu, then press ‘Key 1 - Prompt for ID: Yes or No’. If the ID prompt is set to ‘No’ the reading is
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