Flowserve NRS 1-50 For TWO Electrodes User Manual download pdf (Page 17)

Electrical Connection – continued –

Explanatory notes to schematic respresentations

Steam boiler plants according to TRD 604, EN 12952-07 / EN 12953-06, 72 h operation

Fig. 8

Combination consisting of 2 level electrodes NRG 1...-50 and 1 level switch NRS 1-50 as water level

limiter. Functional safety IEC 61508, SIL 3.

The equipment combination meets the demand for two independent water level limiters.

(Pressurized) hot-water plants and electrically heated steam boilers according to TRD 604,

EN 12953-06

Steam boiler plants with high availability according to TRD 604, EN 12952-07 / EN 12953-06,

72h operation

Fig. 9

Combination consisting of 1 level electrode NRG 1...-50 and 1 level switch NRS 1-50 as water level

limiter. Functional safety IEC 61508, SIL 3.

Hot water installations require two independent and separate water level limiters. For this purpose

one equipment combination NRG 1...-50/NRS 1-50 shall be installed in the hot-water boiler and the

second one in the pressure maintaining vessel, the expansion tank or the like (depending on the type

of pressurization). For electrically heated steam boilers one water level limiter is sufﬁcient.

To meet the plant operator's demand for a higher level of availability of the steam boiler plant, two

(or three) independent equipment combinations NRG 1...-50/NRS 1-50 can be installed in the steam

boiler.

Further applications in accordance with national sets of regulations

Fig. 10

Combination consisting of 1 level electrode NRG 1...-50 and 1 level switch NRS 1-50 as

water level limiter.

The level switch opens two separate safety circuits. Functional safety IEC 61508, SIL 3.

Fig. 11

Combination consisting of 2 level electrodes NRG 1...-50 and 1 level switch NRS 1-50 as

water level limiter.

The level switch opens two separate safety circuits. Functional safety IEC 61508, SIL 3.

Fig. 12

Combination consisting of 1 level electrode NRG 1...-50 and 1 level switch NRS 1-50 as

water level limiter and 1 level electrode NRG 1...-50 / 1 level switch NRS 1-50 as ﬁrst low-level alarm.

Functional safety IEC 61508, SIL 3.

Fig. 13

Combination consisting of 2 level electrodes NRG 1...-50 and 2 level switches NRS 1-50 as

water level limiter.

The level switch opens two separate safety circuits. Functional safety IEC 61508, SIL 3.

Note

n Please observe the safety-related characteristics for the equipment combination 1 level

electrode NRG 1...-50 / NRG 16-36 / level switch NRS 1-50 and 2 level electrodes

NRG 1...-50 / level switch NRS 1-50 on page 6,

Fig. 1.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 27 28

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Flowserve NRS 1-50 For TWO Electrodes User Manual Page 17

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