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...8 MAINTENANCE
8.4 Unscheduled Servicing
8.4.1 Monitor Diagnostic Information
The monitor is fitted with extensive diagnostics which provide
information on routine servicing and problems that have
developed. Any one of these problems illuminate the 'Out of
Service' l.e.d. and de-energize the normally energized 'Out of
Service' alarm relay. This alarm also goes into an alarm state
when the monitor is switched off. Timed calibration is inhibited
but could be started manually. Information is displayed on
Page 1.0 when an alarm has been raised to indicate the cause
of the problem. The diagnostic messages are given in
Table 8.1.
8.4.2 Malfunction of the Monitor
A calibration fail for any reason could be caused by almost any
part of the liquid handling section of the monitor including the
solutions.
Mechanical components which are involved with the liquid
handling, e.g.: pumps; valves; tubing and tubing connections,
should be systematically checked for correct operation and for
leaks or blockages which change the chemical conditions
within the monitor.
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Table 8.1 Diagnostic Messages
Caution. Check that there have been no
unauthorized modifications, e.g., incorrect tubing fitted.
In the majority of cases any problems experienced are
generally found to be associated with the chemistry and the
liquid handling section.
Noise may be due to air bubbles sticking in the pipework or to
the walls on the cuvette. Degassing of the sample is normal
due to pre-heating of the sample on entry into the liquid
handling section. However, the monitor is designed so this
does not normally affect its performance. If the problem is
excessive a chemical rinse should be carried out to clean and
re-wet the liquid handling system and cuvette – see
Section 8.2.4. Reducing the control temperature also helps –
see Section 6, Programming Page 3.1.
The most common problems are associated with the reagent
or standard solutions. Any unpredictable problems may be due
to the standard or reagent solutions, or their flow through the
monitor. If any doubts exist regarding the integrity of these
solutions, they should be replaced with freshly prepared
solutions in the early stages of the fault finding investigations.
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