GESTRA NRS 1-40, Original Installation Manual

Page: 26 / 40

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Press button briefly (1 sec.).
LED 2 flashes rapidly and remains
permanently illuminated after 3 s.
A lowlevel alarm is simulated for
electrode 2.
This test cycle is performed for the waterlevel
limiting system (
two
level electrodes).
NRS 140
– continued –
Test Cycle
– continued –
There are two different alarm conditions:
n
Lowlevel alarm for waterlevel limiter
(
one
level electrode).
n
Lowlevel alarm for waterlevel
limiting system ( two level electrodes).
Lowlevel alarm for water level limiter
LED 1 flashes rapidly.
LED 1 remains permanently illuminated after the deener
gizing delay.
Deenergizing delay: 3 sec. (default)
Lowlevel alarm for water level limiting system
LED 1 and 2 flash rapidly.
LED 1 and 2 remain permanently illuminated after the
deenergizing delay.
Deenergizing delay: 3 sec. (default)
Alarm
Note
n
In the event of an alarm the equipment does not lock automatically.
If a lock function is required an external interlocking device must be provided.
n
The signal output of the terminals 7 and 8 is instantaneously energised when an alarm
is raised.
n
The different lengths of the electrode rods or an inclined water level in the steam boiler
can cause the LED 1 and LED 2 to respond at different times.
NRS 140