7 Prism wash
67
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WASH
RECOVERY
INTERVAL
PRECOND.
Figure 7.1
The automatic prism wash cycle
Preventing automatic wash:
The precondition and wash relays are never activated by the automatic wash control:
–
If diagnostic message is
NO SAMPLE
as this indicates a clean prism in an empty process
line. The diagnostic message is
WASH STOP/NO SAMPLE
.
–
If a wash stop is present, indicating e.g. that there is no process flow. The diagnostic
message is
EXTERNAL WASH STOP
.
–
If the process temperature limit is activated and the temperature falls below the
limit, indicating that the process is not running. The diagnostic message is
LOW TEMP
WASH STOP
.
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