Flowserve NRS 1-51 - Manual (Page 16)

6
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  level electrode NRG ...-5 and  level switch NRS -5 as high water level
alarm. Functional safety IEC 6508, SIL 3.
Further applications in accordance with national sets of regulations
Fig. 9
Combination consisting of  level electrode NRG ...-5 and  level switch NRS -5 as high water level
alarm. The level switch opens two separate control circuits. Functional safety IEC 6508, SIL 3.
d Level electrode(s) NRG ...-5
e
Level switch NRS -5
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.