Boiler water pressure sensor

Broadly speaking, how does the water pressure sensor in a boiler work? I'm told there are 3 wires from it.. how might that work (i.e. it doesn't just present itself as a simple on/off switch, then)

Reply to
Andrew Baker
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Probably power, neutral, and a variable data signal, dependent on the pressure. That's how industrial ones are.

Reply to
Davey

depends on the boiler.

Reply to
cynic

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