Can anyone identify what this box is for?

Lysander said:
To be fair you said a temperature sensor, not a thermostat ;)
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It is a temperature sensor, but people often incorrectly call it a thermostat.

It's connected to a building management system (BMS) which uses its readings to manage the heating, cooling, air flow and in some case humidity levels of the room.

I've only been doing this for 22 years :p
 
Diddums said:
It is a temperature sensor, but people often incorrectly call it a thermostat.

It's connected to a building management system (BMS) which uses its readings to manage the heating, cooling, air flow and in some case humidity levels of the room.

I've only been doing this for 22 years :p
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Ahhhh that makes sense. Why didn't you SAY it was connected to the BMS! When someone said "thermostat" I would have expected a dial with temps on it.
 
builder22 said:
Is that no what it is tho? But with a cover...

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I can almost guarantee it's a regular temp sensor, I've worked in buildings from a 600 year old prison to a state of the art tower in London and I've not seen a pneumatic thermostat which is in service, they were awful things which were constantly failing due to the rubber hoses perishing.

Oddly enough, many air handling units still use the hoses for their differential pressure switches and these too constantly fail, particularly in sunlight - not helpful when these units are often located on rooftops! It's always an easy win, when we take on a new site and the BMS has all manner of errors and faulty readings, things like this cost pennies to sort and can in many cases cure an absolute mountain of faults.
 
Diddums said:
I can almost guarantee it's a regular temp sensor, I've worked in buildings from a 600 year old prison to a state of the art tower in London and I've not seen a pneumatic thermostat which is in service, they were awful things which were constantly failing due to the rubber hoses perishing.

Oddly enough, many air handling units still use the hoses for their differential pressure switches and these too constantly fail, particularly in sunlight - not helpful when these units are often located on rooftops! It's always an easy win, when we take on a new site and the BMS has all manner of errors and faulty readings, things like this cost pennies to sort and can in many cases cure an absolute mountain of faults.
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Can't say 'serviceable' as in 'working' but we played with them yearly in our dump of a client building..they'd go 'psssssshhhhhtttt' and give a fake reassurance it was working..it was still cold though.
 
dLockers said:
Can't say 'serviceable' as in 'working' but we played with them yearly in our dump of a client building..they'd go 'psssssshhhhhtttt' and give a fake reassurance it was working..it was still cold though.
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H'aaaactually, I've just sat here wracking by brain to think of any systems like this where I've worked, and I remembered that the BT head office on Newgate street had a pneumatic BMS. Literally a set of compressors in the basement, a building full of tiny little copper pipes running to every single valve, damper, fan coil unit, etc. which were controlled by an ancient Philips head end, the amount of failure points was truly astonishing. In the two years I was there I don't think I saw more than 20% of the system functional at once, it was quite simply the biggest pile of crap I've ever had the misfortune of working with.

On the plus side fault finding was very easy, we just walked around listening for the pssss sounds.
 
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