Extractor fans, zone 0 and better sensors than humidistats

SH · 2023-01-10T09:55:30+00:00

Right....I have a bathroom that has a 12 volt humidistat sensing extractor fan in zone 0I also have a shower room with a 12 volt humidistat sensing extractor fan in zone 0.the 12V transformers are in the loft above and access is trival. ditto to the ceilings of the two rooms concerned.Now my problem is this, the humidstats are not very good, they do not always sense the steam, and when having an extra long shower, the fan turns off part way through.Users of the bath or shower are not always veru good at keeping on top of the foibles of the extractor fan so I have a requirement to improve this so it is fully automatic.Now my idea is this: to find a PIR ceiling sensor that (a) is safe for use in zone 0 to either switch 240 mains to the transformer or 12 volt supply to fan. (I can remove Humidistat sensing PCB and simply send 12v direct to the fan)The PIR sensor would have to be within the bath or shower tray zone. Otherwise teh shwoer curtain will block teh PIR's view if it is mounted elsewhere.I have windows in both rooms so linking to a switched live from the light fitting doesn't really work.

Jan 10, 2023 Last reply: 3 years ago 22 Replies

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chop 3 years ago

They detect movement of different temperature surfaces and so work fine.

No such thing as a false positive in that situation when it is detecting that the shower is being used as it would do.

No, because those surfaces aren't moving.

Again, no, because those aren't moving.

Nope, it works fine.

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Tim+ 3 years ago

Better still, a working humidistat. The OP’s is clearly faulty.

Tim

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chop 3 years ago

Yep, because then the fan stays on until the bathroom has been dried out with the showerer long gone.

Yep.

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