4.3
SECTION 4. ROUTINE MAINTENANCE AND CALIBRATION
Note: Maintenance of the analyser should be done by qualified personnel who are familiar with
good workshop practice.
4.1 GENERAL
Routine maintenance is limited to checking calibration, inspecting the sampling system and
changing the memory back-up batteries.
The following maintenance instructions are suggested as a guide to the procedure and time
intervals. Frequency of maintenance depends on the accuracy and reliance placed upon the
analyser and may need to be modified as a result of operating experience.
4.1.1 Daily
1. Check the span point calibration and re-calibrate if necessary (See Section 3.6.2).
2. Check the operation of the sampling system and adjust as necessary.
4.1.2 Weekly
1. Check the zero point calibration (See Section 3.6.1)
and then the span point calibration, re-calibrate if necessary.
2. Check filters and replace if necessary.
If fitted, ensure bubbler levels are correct.
4.1.3 Monthly
1. Check loop gain and take corrective action if necessary (See Section 4.6).
2. Check pressure compensation calibration if fitted, and re-calibrate if necessary (See
Section 3.11).
4.1.4 Annually
1. Replace memory back-up batteries if fitted. (See Section 4.5). This is only
required on earlier analysers.
4.2 CALIBRATION GASES
The following calibration gases should be available:
1. Zero gas - Oxygen free nitrogen, minimum purity 99.99%, for setting the zero point.
2. Span gas - A test gas containing a known oxygen content for setting span point.
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