Section 12
Maintenance
46
12
Chamber Lid Plug
A silicone plug is placed in the lid of each chamber. For collecting a gas sample, penetrate the
lid plug with a needle attached to tubing and connect to the gas analyser input. Do not use
needles larger than 0.5mm x 25mm. The angle for penetration should be vertical (+/- 10
degrees) and no horizontal movements should be made. Each plug should not be penetrated
more than 5 times aer which it should be replaced.
Verification of Gas Concentration in Chambers
Order of sampling
1st. Chamber #8
2nd. Chamber #3
3rd. Chamber #7
4th. Chamber #2
5th. Chamber #9
6th. Chamber #4
7th. Chamber #6
8th. Chamber #1
9th. Chamber #10
10th. Chamber # 5
1. Connect a short length of tubing to the gas
analyser input.
2. Connect a 25-gauge needle to the tubing.
3. Penetrate the required chamber through
the silicone plug.
4. Collect the gas sample using the gas
analyser.
5. Stop the gas analyser pump.
6. Remove the needle from the silicone plug.
7. Record the gas concentration reading.
8. Wait 2 minutes between chamber sampling.
9. Repeat for the remaining chambers in the
order shown below.
10. Take the average value for O
2
concentrations in the chamber with the highest and
lowest O
2
concentration and change the calibration setpoint according to this value.
11. Take the average CO
2
concentrations in the chamber with the highest and lowest CO
2
concentration and change the calibration setpoint according to this value.
12. If a chamber is more than +/- 0.5 from gas setpoint, please contact a local Service
Technician.
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