17
d
d
e
e
f
f
Fig. 8
Fig. 9
Electrical Connection
– continued –
Schematic representations of arrangements
Key
Steam boiler plants according to TRD 604, EN 12952-07 / EN 12953-06, 72 h operation
Fig. 8
Combination consisting of 1 level electrode NRG 1...-51 and 1 level switch NRS 1-51 as high water level
alarm. Functional safety IEC 61508, SIL 3.
Further applications in accordance with national sets of regulations
Fig. 9
Combination consisting of 1 level electrode NRG 1...-51 and 1 level switch NRS 1-51 as high water level
alarm. The level switch opens two separate control circuits. Functional safety IEC 61508, SIL 3.
d
Level electrode(s) NRG 1...-51
e
Level switch NRS 1-51
f
Control circuit
Basic Settings
Factory setting
Level Switch NRS 1-51
The level switch features the following factory set default values:
n
De-energizing delay: 3 sec.
Commissioning Procedure
Danger
The terminal strips of the NRS 1-51 are live during operation.
This presents the danger of electric shock!
Always
cut off power supply
to the equipment before mounting, removing or connecting
the terminal strips!
Summary of Contents for NRS 1-51
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