Flowserve NRS 1-50 For TWO Electrodes User Manual download pdf (Page 22)

Measure the electrode voltage in order to check whether the level electrode is immersed or if there is a

malfunction. Please observe Fig. 15.

≈ 0.7 V

85 Hz !

Checking Level Electrodes

Measuring voltage across level electrode

Note

The self-checking routine of the level switch NRS 1-50 reduces U

1-2

to 0 Volt,

if executed cyclically.

2-⊥

Malfunction (immersed/alarm)

1-2

≥

1-2

1-⊥

exposed

immersed

b Stand-by input 1 / 2, 24 V DC, for connecting the logic unit SRL

c Level electrode NRG 1...-50, NRG 1...-11, NRG 16-36

Key

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

NRG 1...-50 NRG 1...-50

1 1

2 2

3 3

NRG 16-36

1-2

⊥-2

⊥-1

1-2

⊥-2

⊥-1

Fig. 15

+ -

⊥

≤

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 28

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Flowserve NRS 1-50 For TWO Electrodes User Manual Page 22