HAKO Scrubmaster B 120 R Service Booklet page 19

2.2.1 Switching off vacuuming /
dirt water tank full
Switch off at recovery tank full:
The indicator switch for recovery tank full, is in the B120R a differential pressure sensor.
As soon as the little ball in the filter sieve is lifted up by the water level and then sucked,
the airflow to the suction motor is interrupted. This leads to different pressure levels at
both connectors of the sensor, and the electric contact of the differential pressure
sensor –B05 is closed. The differential pressure sensor is electrically connected to the
main control unit –A01.X9:10 and –A01.X9:20.
The hose that is fitted to the connector marked with „P" at the sensor, is connected with
T
the borehole in the lid. This end measures the pressure in the recovery tank. The
S
other end of the differential pressure sensor is connected with the bohrhole . This End
is related to the intake of the suction motor.
The maximum tightening torque for the fixing screws of the sensor is 1,6Nm.
Sheet 19