Unidentified devices on ceilings (smoke alarms?)

Jabba_flabba

Just wondering if anyone recognises these?

There is one in the front room and one in the kitchen. My best guess is that they're old style, mains-wired smoke alarms. I don't ever recall them having sounded though.




Thanks.

martinthebandit

I don't think it's a smoke alarm

https://duckduckgo.com/?q=mains+powered+smoke+alarm&t=ipad&iar=images&iax=images&ia=images

kerri_gt

I thought mains powered smoke alarms had battery back ups? Are you in flats or a house? If it's flats could you ask a neighbour if they have the same.
Could they be heat detectors connected to any kind of sprinkler system?

Jabba_flabba

kerri_gt wrote: »

I thought mains powered smoke alarms had battery back ups? Are you in flats or a house? If it's flats could you ask a neighbour if they have the same.
Could they be heat detectors connected to any kind of sprinkler system?

I'll take your word for it about the battery backups; I was only guessing about them being smoke alarms. I'm in a house, mid 30s terrace. Heat detectors are another possibility. Hopefully my post will get enough visibility that someone will know what they are. Thanks.

Hasbeen

Looks like an old style 1970s? bimetal heat detector. Usually tied into a fire alarm system for a building "flats/tower blocks" or sometimes a single house tied into a home alarm system.

When the metal sensor reaches 135 degrees fahrenheit it will close a set of contacts completing the circuit setting off the alarm.

You can if your capable turn power off at mains and pop it off from ceiling, there should be ID label on back.

martinthebandit

If they were heat or smoke detectors, or any sort of alarm I would expect to see something in them designed to make a noise plus a grill to allow the noise out.

So I don't think they are any sort of alarm.

Carrot007

Hasbeen wrote: »

When the metal sensor reaches 135 degrees fahrenheit

And in English?

Jabba_flabba

Hasbeen wrote: »

Looks like an old style 1970s? bimetal heat detector. Usually tied into a fire alarm system for a building "flats/tower blocks" or sometimes a single house tied into a home alarm system.

When the metal sensor reaches 135 degrees fahrenheit it will close a set of contacts completing the circuit setting off the alarm.

You can if your capable turn power off at mains and pop it off from ceiling, there should be ID label on back.

Thanks. I think you're bang on. Found a youtube video of something quite similar. Also a reddit thread with something similar.

Hasbeen

Carrot007 wrote: »

And in English?

https://www.metric-conversions.org/temperature/fahrenheit-to-celsius.htm

Since you do not have google

57c:rotfl::rotfl:

Hasbeen

Jabba_flabba wrote: »

Thanks. I think you're bang on. Found a youtube video of something quite similar. Also a reddit thread with something similar.

Yes its old as well.

Do you have an alarm perhaps still works?

But would advise installing new smoke detectors plus heat detector in kitchen.:)

Jabba_flabba

Hasbeen wrote: »

Yes its old as well.

Do you have an alarm perhaps still works?

But would advise installing new smoke detectors plus heat detector in kitchen.:)

I have a mid-90s burglar alarm system. Possibly they are part of that? There are two newish (and tested) smoke alarms near the stairs and bedrooms, but yes, I will take your advice and get new smoke detectors for downstairs. Thanks.