Spirax Sarco LCS3050 - Page 18

IM-P693-06 EMM Issue 1
18
LCS3050 Low Water Level Switch for two probes
6.2 Measuring voltage across level probe
Measure the probe voltage in order to check whether the level probe is immersed or if there is a malfunction.
Please observe Figure 13.
U
2-4/10-12
U
3-4/11-12
U
2- 3/10-11
immersed exposed Malfunction (immersed/ alarm)
≈ 0.7 V
85 Hz!
<
U
2- 4/10 -12
≥
U
2- 4/10 -12
≤ U
3 - 4/11 -12
2 2
Item
1 CEP Central earthing point in control cabinet
2 Level probe LP40.
Fig. 13
Note
The self-checking routine of the level switch LCS3050 reduces U
2-4
/
10-12
to 0 Volt, if
executed cyclically.
1 2 345678 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
1 1
2
LP40 LP40
2