29
NRS 1-50 For TWO electrodes - USA - Installation & Operating Manual -
850694-00
Measuring electrode voltages on the level switch enables you to check whether the level elec-
trode is immersed or whether a fault is present. Please pay attention to
Fig. 15.
Checking level electrodes
Measuring level switch voltages
Note
■
The self-test of the NRS 1-50 level switch cyclically reduces
U
2-4/10-12
,
possibly to 0 V.
U
2-3/10-11
fault (immersed/alarm)
U
2-4/10-12
2
<
U
2-4/10-12
2
≥
U
3-4/11-12
≤
U
2-4/10-12
U
3-4/11-12
exposed
immersed
c
Level electrode NRG 1...-50
CGP
Central grounding point in control cabinet
Key
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
1
2
3
1
2
3
U
2-4
U
2-3
U
3-4
U
10-12
U
10-11
U
11-12
Fig. 13
c
c
CGP
CGP
NRG 1..-50
NRG 1..-50
≈ 0.7 V
85 Hz!
