I want to replace a temperature sensor for a 240v max 1100w pressure cooker / slow cooker but I'm confused about which one to get
I have found sensors but they ask for a specific temperature specification and whether the sensor is Normally Open or Normally Closed.

Can anyone advise which specs and type to get?

When I test the continuity between the two terminals it shows full continuity.

Please see attached pics.

Thanks

 

Is there any writing on the white bit?

 

When I test the continuity between the two terminals it shows full continuity.

How do you know that part is faulty if you don't know what it is supposed to do (is it supposed to turn on or turn off?).

 

ON THE ASSUMPTION THAT THE TWO THERMAL SWITCHES DIRECTLY CONTROL THE TEMPERATURES FOR SLOW COOKING AN PRESSURE COOKING (I.E there is no electronics) then i am GUESSING that there is a switch that selects the mode. The higher temperature thermal switch will be in series the the contacts on the mode switch which are closed when set to pressure cooker mode. I would guess that the temperature ratings of the thermal switches would be a bit below 100 Deg,C for slow cooking and a few degrees above 100 Deg.C for pressure cooking mode. They will be normally closed switches.
I have just looked at some thermal switches I have in stock and some are marked with the temperature rating on the underside.

Les.

 

ON THE ASSUMPTION THAT THE TWO THERMAL SWITCHES DIRECTLY CONTROL THE TEMPERATURES FOR SLOW COOKING AN PRESSURE COOKING (I.E there is no electronics) then i am GUESSING that there is a switch that selects the mode. The higher temperature thermal switch will be in series the the contacts on the mode switch which are closed when set to pressure cooker mode. I would guess that the temperature ratings of the thermal switches would be a bit below 100 Deg,C for slow cooking and a few degrees above 100 Deg.C for pressure cooking mode. They will be normally closed switches.
I have just looked at some thermal switches I have in stock and some are marked with the temperature rating on the underside.

Les.

Thank you very much for that. This is a fast and slow cooker. I'll pull it back out and remove some of that conductive goo to see what it says.

I agree, it's 'NC'.

The error code tells me there's something Wrong with the temp sensor so it should be cheap enough to find out.

 

If it has enough electronics in it to display error codes then the thermal switches may be just over temperature cutouts. There is probably a temperature sensor that is used to sense the actual temperature.

Les.

 

There is likely one to sens the temp and a "fail safe" thermal switch that cuts out (permanently) if temp ever gets to the level it trips. It may not be connected to any other electronics other than a very low value "sense resistor".

 

Yes, what you are looking at is a high temp safety, not a temp sensor.

 

Here's a pic of the underside of the sensor

 

Also, what is this part for. It's a square black block with two wires coming out of it. It sits right at the centre bottom of the inner pot and sits under a spring loaded button that the removable pot sits on top of.

 

I looked up the sensor and it says it's 140 deg celsius Normally Closed

 

Also, what is this part for. It's a square black block with two wires coming out of it. It sits right at the centre bottom of the inner pot and sits under a spring loaded button that the removable pot sits on top of.
View attachment 263325

that is likely your temp sensor. The first high temp switch you shown is a snap action type switch and would not handle the duty cycle of temp regulation.

 

Well I took the actual temp sensor / thermostat out and tested the continuity between the contacts. It has continuity.

Should there be continuity between the contacts and what does this say about this component?

 

I would have expected it to be a thermistor whose resistance changed with temperature. (There are other types of temperature sensor but I think a thermistor is the most likely type used.) I suggest Googling for your appliance make and model number spares. In the past I have found a few companies that list available spares for domestic electrical appliances.

Les.

 

https://www.hctemp.com/KSD1-bimetal-thermostat-10A-16A-with-bakelite-or-ceramic-base-pd40395385.html

 

Yes, the temperature sensor in slow cookers, rice cookers, and the like is at the bottom center and springloaded to ensure good thermal contact with the cooking vessel.

The ones I have seen are NTC thermistors and seem to be generally 10K.

 

Thanks for the replies. It's been a great help believe me. I don't suppose any of you know where I would find the pressure sensor in the pressure cooker would you?

I've taken the element put and everything and it doesn't seem to be around the element or inner bowl.

Is it situated separately in the small cluster of electronics under the base? If so, it's hard to understand how it would work.

Thanks again.

 

Thanks for the replies. It's been a great help believe me. I don't suppose any of you know where I would find the pressure sensor in the pressure cooker would you?

I've taken the element put and everything and it doesn't seem to be around the element or inner bowl.

Is it situated separately in the small cluster of electronics under the base? If so, it's hard to understand how it would work.

Thanks again.

All the pressure cookers I know of use a passive device to manage the pressure with a weight on top of a valve on the lid.

 

As I have never worked on a slow cooker / pressure cooker I would GUESS that the pressure MAY be controlled by the temperature. You should be able to find charts online of the boiling point of water at different pressures.
If you find spares suppliers for your appliance in your country they will probably show pictures of the pressure sensor if there is one.

Les.

 

All the pressure cookers I know of use a passive device to manage the pressure with a weight on top of a valve on the lid.

That's what I think too. Cheers