3.38
3.11.2 Pressure Compensation Calibration Error
The following error indications listed below in Table 3.5 will be displayed during a pressure
compensation calibration.
TABLE 3.5 PRESSURE COMPENSATION ERROR INDICATIONS
DISPLAY DESCRIPTION
0.01 70
0.02 70
0.04 70
0.06 70
0.08 70
0.14 70
0.24 70
0.70 70
Pressure compensation calibration completed. New
correction being used.
First stage completed, back pressure to be applied.
Oxygen/pressure slopes in opposite directions or
insufficient difference between first and second readings.
Auto-calibration in progress, pressure compensation
calibration aborted.
Pressure compensation not fitted.
Second oxygen reading is negative. Calibration aborted.
First oxygen reading is negative. Calibration aborted.
Pressure compensation is fitted but is not calibrated. The
oxygen reading is not corrected.
Note that if the calibration routine is aborted the previous calibration constants are retained (not
01100651, 01100652 and 0100699 software).
3.12 REMOTE SELECTION OF CALIBRATING GASES
Using the auto-calibration option board it is possible to select remotely the calibrating gases
without using the full facilities of auto-calibration. This is useful when the Control unit is situated
some distance away from the Transducer unit.
The gas selection system is identical to that used for auto-calibration (see Section 3.10).
To operate the valves the key 'VALVE' and the relevant key, ZERO, SPAN or SAMPLE is used,
e.g. to select the span gas.
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