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8 Service and Maintenance
NOTICE
Do not forget!
Perform a new offset-calibration in ambient air and enter the probe’s new temperature value
after replacing the probe.
Limit value 4 is set at the factory: An automatic check of the probe is possible at downtime and
at pre-purge of the plant. No response of the limit values!
An intact probe does not cause fault no. 1.
If fault no. 1 ’probe voltage < -30 mV’ occurs reset it manually.
NOTICE
After the loss of the power supply (and therefore the heating of the probe) the probe voltage
may decrease for a moment to -30 mV in the heating period.
Recommendation: Retain the factory-set limit value 4 for safety reasons.
If the facility cannot be switched off, the probe must be dismantled for examination.
Limit value 4 → 5 mV shortfall, automatic reset
Delay time of the trigger 3 seconds
-30 mV shortfall is monitored by fault no. 1
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