4
Important Notes
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Function
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During operation the
standby time
is started after the interval time has elapsed and the interval time is
reset to its initial value.
During the standby time the connecting lines must be rinsed.
Synchronizing:
When valve D or E closes, the
purging time
starts and the interval time is reset to its
initial value. The purging time can start any time. The purging time also starts when the logic unit is
switched on and after the standby time has elapsed.
Once the purging time has started the stand-by input of the level switch NRS 1-50, NRS 1-51 will also
be activated.
During the purging time all valves must be opened and closed in a fixed sequence. The logic unit polls
the limit switches to obtain data on the valve positions and the level switch for information on the water
level (low level if electrode is exposed).
If valves D and E are open after the rinsing process and valve F closed and the level electrode for low
water (low level) is submerged again, the stand-by input of the level switch NRS 1-50, NRS 1-51 will be
deactivated.
The stand-by time of the level switch is limited to a maximum of 5 minutes. If the stand-by input is not
deactivated by the logic unit during this time, the level switch will open the safety circuit.
Safety note
The equipment fulfils a safety function and must only be installed and commissioned by qualified and
competent staff.
Retrofitting and maintenance work must only be performed by qualified staff who – through adequate
training – have achieved a recognised level of competence.
