3.37
Display should show
100.00 (±0.02%)
This is now the compensated oxygen reading.
12. Recalibrate the span point.
13. After calibration the pressure compensation can be checked by performing the
following tests. Allow the oxygen reading to stabilise after each adjustment which
takes about 30 seconds.
Bypass flow Sample flow Back pressure Display
(Litres/min) (ml/min) valve reading
6.5 100 Closed 100.00 ±0.02
5.0 100 Closed 100.00 ±0.03
4.0 100 Closed 100.00 ±0.03
3.0 100 Closed 100.00 ±0.03
2.0 100 Closed 100.00 ±0.03
1.0 100 Open 100.00 ±0.03
If these checks fail repeat the full pressure compensation calibration keeping the cell
sample flow constant and avoiding vibration.
14. Return to the sample gas and check that the back pressure valve is open.
The output of the pressure transducer is available by DISPLAYing parameter 15. This is in
arbitrary units and is linear with absolute pressure.
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