A7.2
APPENDIX 7. SOFTWARE 01100 651, 01100 652 AND 01100 699
This manual may be used for the above versions of software but there are a number of
differences.
Alarm code 67 (memory corrupted) is not permanently allocated to relay 4. It is not possible to
allocate this alarm to a relay.
Customised default values are not available.
The major difference is auto-calibration. The section below replaces Section 3.10 of this manual.
3.10 AUTOMATIC CALIBRATION
3.10.1 Introduction
The relay board has three relays which can be used to drive solenoid valves on the sample, zero
gas and span gas streams used for calibrating the analyser. The analyser can initiate an auto-
calibration sequence in which the zero gas is turned on and a zero gas calibration point
determined, the span gas turned on and span gas calibration point determined and finally a return
to the sample gas. If the procedure is executed correctly then the analyser recalibrates on return
to sample.
Note: For auto-calibration to be successful, the following conditions must be met:
1. The oxygen concentration of the zero gas must be at least 1.5% O
2
less than the
oxygen content of the sample gas.
2. The oxygen concentration of the span gas must be at least 1.5% O
2
greater than
the oxygen content of the sample gas.
3. The oxygen concentration of the sample gas must not change by more than 1.5%
O
2
during the auto-calibration sequence.
4. Oxygen concentration of the sample gas must be between the oxygen
concentrations of the zero and span gases.
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