Sous Vide Thermostat protection

[riccardo.pittini]

Hi All

I'm repairing a sous vide  (immersion water cooker) it has a thermostat that is used for limiting the temperature of the resistive element in case of low water level.
Similar to the protection of a water boiler.

The thermostat failed, so I need to replace it, there are no codes on the old one so i cannot get the right tripping temperature. What temperature would you select for the protection thermostat?

I was thinking 120C or 140C (considering that the temperature of the resistive element will be a bit warmer than the maximum water temperature).

https://www.aliexpress.com/item/5pcs-Thermostat-10C-240C-KSD9700-40C-45C-50C-55C-60C-65C-Bimetal-Disc-Temperature-Switch-Thermal/32991291161.html?spm=2114.search0104.3.163.5d4c41f6UGzSwx&ws_ab_test=searchweb0_0,searchweb201602_7_10065_10068_319_10059_10884_317_10887_10696_321_322_10084_453_10083_454_10103_10618_10304_10307_10820_10821_537_10302_536,searchweb201603_52,ppcSwitch_0&algo_expid=3f9a4085-4203-4c37-ab41-d0141dbfcb61-24&algo_pvid=3f9a4085-4203-4c37-ab41-d0141dbfcb61&transAbTest=ae803_5


What do you suggest?

Thanks

[soldar]

I was thinking 120C or 140C (considering that the temperature of the resistive element will be a bit warmer than the maximum water temperature).

Depends on how close thermally speaking it will be to the resistive element. If very close 140, if farther 120, if in doubt 140, if there are plastic parts which can melt 120, etc.

Maybe you can measure the temperature under normal consditions at the spot where it goes?

[timelessbeing]

Unless it is under pressure, liquid water does not exceed 100C. Obviously, it would turn into a gas if it did.

The whole idea behind sous vide cookers is that you use a lower cooking temps (50-70C). If you wanted to boil the water you would use an ordinary pot.

With those two things in mind, I would choose a thermostat that was very close to 100C.