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Old March 20th, 2017, 02:45 PM   #1
Bob O
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OT-Temp Switch and Probe

Iím looking information on the items shown in the attached pictures.

I havenít seen these temperature probes before and there isnít any identification on them.

I also canít locate information on the temperature switches in the other picture.
This system is controlling immersion heaters in heavy oil storage tank.

TIA for any help.
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File Type: jpg Temp Switch.jpg (32.3 KB, 66 views)
File Type: jpg Temp Probe.jpg (25.1 KB, 61 views)
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Old March 20th, 2017, 04:08 PM   #2
Eric Nelson
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I'm guessing you're looking for a replacement? If you Google 'remote capillary thermostat', you will find many similar items. For example:

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Old March 20th, 2017, 04:11 PM   #3
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They look like they may be capillary type controllers. Try Omega for similar device:
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Old March 20th, 2017, 09:12 PM   #4
Bering C Sparky
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Or you could get rid of the dinosaurs you are using and upgrade to 21st century tech, by using something like this.

I use these on my refrigeration cabinets and walk-ins.

EDIT: I may have spoken to soon, I did not look at your second photo until after I posted this. If your probes are emurssed in a liquid this device is probably not what you would want to use.
Also after looking harder at your 1st picture it looks like you are switching line voltage and may need a much larger amperage rating on your switch contacts, this device i believe is only good up to 10 amps but it does have 2 sets of dry relay contacts that can be configured to operate at separate set points

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Last edited by Bering C Sparky; March 20th, 2017 at 09:38 PM.
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Old March 21st, 2017, 12:29 AM   #5
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Good practice calls for fastening a gas-actuated bulb in the thermowell. The photos show the sensor bulbs in the thermowells with no split nut or union connector, but maybe that slotted screwhead is holding the bulb in place.

If the bulb comes out of the thermowell, the indicated temperature is a-m-b-i-e-n-t, not whatever is supposed to be measured. Most likely temperature will be below setpoint, so the thermostat will call for heat. And more heat. And more heat because the bulb can not respond being out of the thermowell.

Make sure the bulb is fastened to the thermowell.
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Old March 21st, 2017, 08:56 AM   #6
Bob O
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Thanks Guys!

Feeling a bit like a dumba$$ about now that I didn't figure it out but life goes on.
I now have something to go on.
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Old March 21st, 2017, 04:35 PM   #7
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We use Danfoss RT for our applications. Same principle, but a little bit more refined*
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Old March 26th, 2017, 09:20 AM   #8

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yep danfoss and several others in the HVAC business has these still.
and grainger and honeywell (yours is original a honeywell)
skype shooter paul.deelen
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