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PR-23 instrucon manual
Preventing automatic wash:
The preconditioning and wash relays are never activated by the automatic wash con-
trol:
− Under the diagnostic message NO SAMPLE (see Section 8.2.6) as this indicates a
clean prism in an empty process line. The diagnostic message is WASH STOP/NO
SAMPLE.
− If a wash stop input switch is closed (see Section 6.3.2), indicating e.g. that there
is no process low. 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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