Instructions

11
Working :
With both sensors dry, LD3 illuminates (LOW LEVEL), fig 6.0
When sensor S2 is wet, LD2 illuminates (MEDIUM LEVEL), fig 6.1
When the liquid level rises and S1 also becomes wet, LD1 (HIGH LEVEL) and LD4 (relay “on”) illuminate, fig 6.2
If the level then falls and only sensor S2 remains wet, LD2 and LD4 illuminate, fig 6.3
If the level keeps falling and sensor S2 also becomes dry, only LD3 illuminates, and the relay is switched off, fig 6.0
Applications
LD2
To Main PCB
LD1
To Main PCB
LD4
NC NO
C
Fig 6.1
Fig 6.3
To Main PCB
LD3
To Main PCB
LD4
LD2
C
NC
NO
Fig 6.0
Fig 6.2