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6.3 Unscheduled Servicing
6.3.1 Monitor Diagnostic Information
The software incorporates diagnostic facilities which provide information on the status of the instrument (lower line of the Program
Parameters display) in the Operating Display Page. All diagnostic messages result in de-energising the 'Out of Service' relay with
the exception of the 'Out of Range' condition.
Due to the fail-safe operation of the relay, an alarm condition is generated in the event of a loss of mains supply.
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6.3.2 Unstable or Erratic Readings
This is usually caused by air bubbles entrained in the sample
and is usually more pronounced on the low level sensor due to
its greater sensitivity. These bubbles are usually as a result of
degassing of the sample caused by a drop in sample pressure,
or a rise in temperature. Cleaning the optical windows and
increasing the flow through the flowcell usually overcomes the
problem. If severe, it is recommended that a de-bubbler unit is
installed – see Section 2.4.
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Table 6.1 Diagnostic Information
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