OMGA5KN4.4 GA5000 gas analyser
Page 56 of 113 Copyright Geotech
gas sample and clean air purge run-time, as using an H
2
S filter increases the
response time of the analyser.
Carbon dioxide is measured by infrared absorption at a wavelength specific to carbon
dioxide. Therefore, the carbon dioxide reading will not be affected by any other gases
usually found on landfill sites.
The oxygen sensor is a galvanic cell type and suffers virtually no influence from CO
2
, CO,
H
2
S, NO
2
, SO
2
or H
2
, unlike many other types of oxygen cell.
The infrared sensors will not be ‘poisoned’ by other hydrocarbons and will revert to
normal operation as soon as the gas sample has been ‘purged’.
H
2
S filter:
Instructions for use:
The following diagram shows how to modify the standard water trap and sample tubing
to fit the H
2
S filter.
Note: When onsite the site engineer must have an unmodified water trap assembly
in addition to the modified water trap with a H
2
S filter in order to take
readings with and without a filter.
1) Once the H
2
S filter is fitted follow the instructions as detailed on the front of the gas
analyser displayed when taking readings using a H
2
S filter.
Note: This is only for analysers fitted with the CO compensated cell.
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