If the level electrode (high or low level limiter) is installed in
an isolatable level pot outside the boiler, make sure that the
level pot is drained and the connecting lines are rinsed at
For this purpose the connecting lines must be shut off and
opened at regular intervals and by opening and closing the
drain valve the lines and the level pot will be rinsed.
The logic unit SRL 6-40 is designed to be used in conjunction
with control unit NRS 1-40.1 and NRS 1-40.2 to monitor the
correct timing and sequence of valve operations.
The equipment consists of a touch screen with integral PLC
and I/O system. Its design is in accordance with EN 50156
and the data exchange is effected via CAN bus using the
The logic unit monitors the following times and process
Interval time: This is the time interval at which, depending on the operating mode (24h / 72h operation), the
connecting lines have to be purged.
Standby time: The purging process must be initiated
during this time. The standby period begins when the
interval time has elapsed.
Purging time: During this period the valves must be operated so as to initiate the purging process. Operation of the
valves and exposure of the LW level electrode is sensed
and signalled by the limit switches. If a message is not
received during the purging time, the safety circuit will
be interrupted. The monitoring of the purging time is a
safety-relevant function because a water level limiter may
be bypassed for a maximum of 5 minutes.
"Gestra SRL6-40" More Information
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