Pictured is a CH-152-35 thermostat. It is similar but not identical to the one described at http://www.wako-clinac.co.jp/product_en/ch-152-35_en/index.html

I don't have a way to heat this thermostat in a controlled fashion until the switch opens- So I cannot determine its temperature setting by experimentation.

There is more information than just the part number printed on the side of it. I am thinking that perhaps the "195" on the second row of text is the temperature rating - but I cannot find anything via Google that takes my idea from a guess to a fact.

Can someone please tell me if that "195" number is indeed the temperature setting for the thermostat and if the "4131" at bottom is useful information?

As a further help, maybe explain if this is standard marking technique for this type of component and where a reference for these markings might live?


  • \$\begingroup\$ I don't have a way to heat this thermostat in a controlled fashion ... do you have access to a kitchen with an oven? \$\endgroup\$ – jsotola Feb 27 '18 at 22:48
  • \$\begingroup\$ LOL, yes. Yes, I do. And if I put electronics inside of it with leads coming out to a meter or a lamp, I will pay very very dearly for doing so. Not everything is available for experimental use... \$\endgroup\$ – 111936 Feb 27 '18 at 22:50
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    \$\begingroup\$ Just say that you're calibrating the oven so that it behaves better ... Practice an air of confidence while doing so ... \$\endgroup\$ – brhans Feb 27 '18 at 23:11
  • \$\begingroup\$ Come for an electronics answer... get relationship management advice! LOL! Any input regarding the markings in the object? \$\endgroup\$ – 111936 Feb 27 '18 at 23:48

Here is an example datasheet for similar thermostats.

You will note that there is not only just a nominal temperature, but the thermostat may be open or close at temperatures beyond the switching region, there is a (usually large) hysteresis which may be above, below or above and below the nominal temperature, and a tolerance. Of course there are electrical and life ratings as well, and usually safety agency approval numbers.

enter image description here

Chances are the second number is the temperature, and the bottom number is a date code, but that's just a (reasonable) guess.

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    \$\begingroup\$ Also verified temperature range of this thermostat by accidentally finding the schematics for the printer this came out of. \$\endgroup\$ – 111936 Mar 1 '18 at 21:05

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