Electronics > Beginners
Flowmeter Pulse generator
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meeder:
I had the chance to take apart an old mechanical flowmeter and I was a bit puzzled by the way the pulse output works.

In electronic flowmeters the pulse output is normally of the open collector type but this mechanical one obviously has to use a different method since the flowmeter isn't powered.

There is a sensor which has two small coils and a disc which turns in between these coils. The pulse input of the PLC has a active 24V DC supply connected to the pulse output. When disc turns there is a pulsing current flow proportional to the volume flow through the measuring device.

Can someone enlighten me on how this arrangement is working?




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