Commissioning
Filtration Learning System
56
© Festo Didactic
696684
11.7
Adjusting sensors
11.7.1
Capacitive proximity sensor
The two capacitive proximity sensors are used for level detection in the tanks. They should be adjusted so
that you can detect the liquid in the tank without contact, but not the tank surface. The liquid changes the
capacitance of a capacitor integrated in the proximity sensor.
Note
The capacitive proximity sensors are used at the positions of the lower level and the upper level.
Prerequisites
–
The tank and a profile for installing the mounting brackets are mounted
–
Electrical connection of the capacitive proximity sensor is established
–
Power supply unit switched on.
Procedure
1.
Mount the proximity sensors with the mounting bracket so that they do not touch the tank. Distance in
each case 5 mm from the tank.
2.
Fill the tank with liquid.
3.
The proximity sensors are set to the following values:
– Waste water tank: 0 l (bottom); 6 l (top)
– Process water tank: 0,5 l (bottom); 6 l (top)
4.
Move the sensors up or down until the switching status display (LED) switches on at the respective
volume level.
Note
The proximity sensor must be triggered by the liquid in the tank. If there is no liquid in the tank, no
signal may be present.
5.
Check the positioning and adjustment of the proximity sensor by repeated filling and emptying of the
tank.
