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4.4 Replacement of the Oxygen Cell
1. Ensure the monitor is switched off.
2. Remove the 2 security tags, open the 2 latches on the monitor and open the case.
3. Un-latch the inline oxygen cell connector.
4. Carefully unscrew the oxygen cell c/w o ring from the manifold (you may need to partially loosen
the oxygen cell with a pair of grips) whilst also supporting the manifold with your other hand.
5. Refit the new oxygen cell c/w o ring to the manifold (hand tight).
6. Check that the 2 tubes are still connected to the manifold and are not loose.
7. Re-connect the inline oxygen cell connector.
8. Ensuring that no wires or tubes are trapped close the monitor case and lock the latches.
9. Perform a cold start and factory set, then a zero and span calibration to fully re-calibrate the
oxygen cell.
10. Finally check the oxygen cell again with the span gas to confirm calibration is ok then re fit new
security tags.
4.5 Battery Replacement
Although unlikely it may be necessary to replace the battery :-
The analyser should be opened only in a clean and dry environment.
1. Ensure the analyser is switched off.
2. Open the analyser. This may require the removal of the security tags before the analyser can be
opened. The analyser should only be opened in a clean and dry environment.
3. Locate the flying lead from the battery pack. Unplug it from the printed circuit board.
4. Undo the two screws holding the battery pack in place. The battery can now be removed from its
holder.
5. Slide the new battery in and plug the flying lead into the printed circuit board.
6. Tighten the two retaining screws, ensuring that they are not overtightened
7. Close the analyser and replace the security tags.
8. Dispose of the old battery following NiMH guidelines.
4.6 Spare Parts
The following are user serviceable spare parts -
Inlet port particulate filters - pack of 10
In-line water trap PTFE filters - pack of 10
VOC filter
Allen (Hex) key
Please contact Geotechnical Instruments (UK) Ltd., or your distributor for availability and up-to-date
prices and information.
4.7 Cold start
A cold start should only be carried out if no other course of action has proved successful, as this function
will clear the instrument memory entirely, reset all factory settings and reset the internal time and date to
a default setting. A cold start of the unit can be performed by holding down the '3' key while switching the
unit on.
Page 10
Order Code
GA4.1
GA4.2
GA6.4
093888
Geotechnical Instruments
CODAOM002 Iss.06
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