5.5
5.4 Serious Fault (Shutdown) Conditions
If the Fault LED is illuminated and the Analogue Outputs have been driven HIGH (or
LOW, depending on selection), a Serious Fault exists and the Measurement Display
will show "Measurement Invalid".
Immediate action should be taken to rectify the fault, and qualified service personnel
should be called.
The SERIOUS FAULT messages listed in Table 5.3 will result in a Shutdown.
5.5 Cell Maintenance
As a guide the cell should be removed for cleaning when the Reference detector
signals (Section 5.2) fall below 50% of their original values. In aggressive sample
conditions, the loss of signal may be due to general corrosion or pitting of the cell
windows. In this case the cell windows may have to be replaced. Otherwise, the cell
and windows can be dismantled and carefully cleaned and all items (except O-rings)
re-used. See Figure 5.1 for general construction of the cell.
Table 5.3 – Serious Fault Displays
Display Message History Log
Entry
Description/comments
INFRARED SOURCE
FAILURE
SOURCE FAIL Source failure
CHOPPER MOTOR
OUT OF LOCK
OUT OF LOCK Motor or timing failure
DETECTOR SIGNAL
HIGH
DET SIG HI Possible loss of IR filter, loss of
liquid sample.
NOTE
• Detector Signal High may also occur and cause temporary shutdown on
liquid analysers if there is no liquid sample in the cell, e.g. at initial power-up.
Check for loss of flow if sensor fitted. Try Manual Zero on good zero sample if
sample flowing.
• The user interface remains operational during Shutdown and can be used to
diagnose the likely cause of the fault via the Fault Display and Fault History.
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