For safety reasons two sensors never wash simultaneously. If the manual wash button for
sensor A is pressed while sensor B is washing, the wash cycle for sensor A is started after
B has
finished. Similarly, if the interval time for sensor B elapses when A is washing, the
wash for sensor B is delayed until A has finished.
In case of remote wash request the request is discarded if it arrives when the other sensor is
washing. The request is honored only if the contacts are held closed until the other sensor
has
finished.
The wash relay is closed for the wash time specified in the wash settings. If the wash auto-
cut functionality is active, the wash may be ended earlier, see
Figure 43 (page 81). The
specified wash time is never exceeded.
After the wash phase is completed, a recovery time is spent. During the wash cycle
(precondition, wash, recovery) the measurement result is in hold unless otherwise specified.
Preventing automatic wash
The preconditioning and wash relays are never activated by the automatic wash control:
• Under the diagnostic message 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 input switch is closed, see Configuring input switches (page 68),
indicating, for example, 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.
PR-23 Series User Guide
IM-EN-PR23-E
78
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