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NRS 1-50 For TWO electrodes - USA - Installation & Operating Manual -
850694-00
Electrical connection
Key to example switching combinations
Steam boiler plants
Figure 6
Combination consisting of 2x NRG 1...-50 level electrodes plus NRS 1-50 level switches as water
level limiters.
This combination satisfies the requirement for two mutually independent water level limiters.
Hot water installations and electrically heated steam boilers
Figure 7
Combination consisting of 1x NRG 1...-50 level electrode plus NRS 1-50 level switch as a water level
limiter.
The requirement for hot water installations to have two mutually independent water level limiters
is satisfied by installing a combination consisting of one NRG 1...-50 + NRS 1-50 in the hot water
generator and another in the pressure maintaining vessel or expansion tank, etc., depending on
the type of pressurization. Electrically heated steam boilers require only one water level limiter.
If the plant operator requires greater availability from the steam boiler plant, this can be achieved
by installing two mutually independent NRG 1...-50 + NRS 1-50 combinations in the steam boiler.
For further uses, please refer to the regulations in your country
Figure 8
Combination consisting of 1x NRG 1...-50 level electrode plus NRS 1-50 level switch as a water
level limiter.
The level switch opens two separate safety circuits.
Figure 9
Combination consisting of 2x NRG 1...-50 level electrodes plus NRS 1-50 level switches as water
level limiters.
The level switch opens two separate safety circuits.
Figure 10
Combination consisting of 1x NRG 1...-50 level electrode plus 1x NRS 1-50 level switch as a wa-
ter level limiter and 1x NRG 1...-50 level electrode plus 1x NRS 1-50 level switch as an advance
low water alarm.
Figure 11
Combination consisting of 2x NRG 1...-50 level electrodes plus 2x NRS 1-50 level switches as
water level limiters.
The level switches open two separate safety circuits.
