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My heating system at home uses a couple of Grundfos pumps to circulate warm water. They are controlled by my heating system and as far as I can tell, running on 220V AC.

I would like to track when these pumps are running. Is there a sensor that could detect this? I don't want to connect something to my heating system, so the sensor should detect the running pump "externally".

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  • \$\begingroup\$ This will produce an AC signal! I use much the same idea to control an extractor fan for an electric shower, but I use a comparator (LM311) to detect the AC and use the pulses to drive the fan control. \$\endgroup\$
    – user131342
    Nov 16, 2017 at 9:50

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A Hall effect sensor should be able to pick up the varying magnetic field when mounted near the motor. This provides a low-voltage, isolated sensor. Amplify, rectify and threshold the output to provide the digital signal.

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There are non-invasive current sensors or split-core current transformers that can be clomped around a single wire to detect current. You will need sufficient access to the wiring to place the sensor around a single wire. Tt can not detect current in a 2-wire cable.

There are also non-contact voltage sensors. One of those might work if the only wiring accessible is a cable. Those may only be available as hand-held indicators. You will need to search to see if something is available for connecting to a monitoring circuit. It might be possible to modify a hand-held device.

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