Water Level Sensor Operation - Nilfisk-Advance R 253 9087362020 Service Manual

Service Manual – Scrubtec R 253 - RA40

Water Level Sensor Operation

The water level sensor (SW1) is positioned about half the height of the solution tank so as to provide the in-
formation to the electronic system on the level of water present in the tank (more than half, less than half)
Through this information the times of opening of the solenoid valve (EV1) and the detergent pump (M4) are
adjusted to maintain this flow more constant (Figure 1)
The water level sensor is capacitive with NPN output (output 0 Volt with water, floating without water).
Full
Figura 1
FUNCTION ELECTRONIC BOARD (EB1)
Figura 2
½
Solution tank
(B+) 24V
J5.1
Input
5V
J5.2
(B-) 0V
J5.3
With sensor
Without sensor
Empty
WATER LEVEL SENSOR (SW1)
Power Supply
Solution System 93