Page 69 of 127
Operating Manual
OMGEM5KN – Iss. 5.1
Copyright – Geotechnical Instruments (UK) Ltd
The results of the calibrations will need to be recorded to monitor over time whether the frequency of
calibration needs to be increased or decreased relative to the confidence required.
The confidence required will be driven by the site specific / user requirements.
When undertaking the monitoring with an understanding of the history of the gas levels of that site, a calibration
check could be triggered if the readings measured are different to what is expected.
Note: For assistance please contact Technical support at Geotech on +44(0)1926 338111.
Calibration gases
User calibration of a gas analyser will greatly improve the data accuracy in the range of the calibration gases
used. This may cause less accurate readings of concentrations outside this calibrated range. Users should select
the correct calibration gas for the expected gas levels on their particular application.
To improve calibration at lower levels requires the use of gas mixtures 1 and 2.
To improve higher levels use gas mixture 3.
For standard CO only 100ppm CO gas is needed.
For CO (H2 compensated) both CO 100ppm and H2 1000ppm gases are needed.
The following table indicates the different gas mixture canisters used for calibration:
Calibration targets for gas cells are dependent on the gas/range and type of cell fitted. Contact Technical
Support for assistance.
These are for general use but other gas concentrations can be used.
Note: The above gases and most other gas concentrations can be supplied by Geotech. For further
information please contact Sales on +44(0)1926 338111 or email sales@geotech.co.uk.
Calibration gases can be dangerous.
For each gas used the appropriate material safety data sheet must be read and understood before
proceeding.
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