Festo MPS PA, Operating Instructions Manual

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Bottling Learning System Commissioning
© Festo Didactic 696690
57
11.7.2 Float switch, cover installation
The float switch is intended for installation in tanks. The float switch opens when the maximum liquid level
in the tank is exceeded and switches off the pumps via the relay.
Prerequisites
– The tank is mounted
– Electrical connection of the float switch established
– Power supply unit switched on.
Procedure
1. The float switch is led from the inside through the cover opening in the tank and screwed from the
outside.
2. Connect the float switch. The switch must emit a signal without liquid.
3. Fill the tank and determine if the float switch interrupts the signal when the maximum fill level is
exceeded. The float must move upwards.
4. Check the positioning and adjustment of the sensor by repeated filling and emptying.
Note
Make sure that the float always moves freely and does not jam due to dirt.
11.7.3 Ultrasonic sensor
The ultrasonic sensor is intended for installation in the cap of tanks. The ultrasonic sensor emits an
inaudible ultrasonic signal, which after reflection on an object, such as the liquid, returns to the receiver in
the sensor housing. The ultrasonic sensor supplies an analog signal (0… 10 V) as a function of the filling
level.
Note
The ultrasonic sensor can be used for both rising liquid levels and falling levels.