How to identify temp setting on a CH-152-35 thermostat

Question

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?

Answer 1

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.

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