Operating Principle Of The Flowmeter - Electrolux EWF1284EDW Service Manual

11.10.2 Operating principle of the flowmeter

The main components of the flowmeter are:
1. Turbine (with magnet and
counterweight mounted on the
outside)
1 Reed contact (normally open)
2 Magnet
3 Counterweight
Water entering the solenoid valve rotates the turbine (1) and magnet (3), which passes in front of the Reed
contact (2), thus closing it. As this contact opens and closes, it generates pulses (at a frequency that depends
on the water flow rate).
The turbine completes 230 revolutions for each litre of water. The operating range of the flow sensor is
0.2÷10 bar.
Using the signal it receives, the micro-processor can calculate the number of litres of water passing through
the solenoid valve.
Technical Support - MDM
Closed contact
Signal 0
61/97
Open contact
Signal 1
599 76 11-68 Rev. 01