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Checking the oven sensor resistance

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The oven doesn't reach its proper temperature. So I took the temp. sensor out and measured the resistance. It was

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  #1 (permalink)  
Old 10-30-2009, 12:08 AM
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Default Checking the oven sensor resistance
Model Number: 3627391592   Brand: Kenmore   Age: 5 - 10 years   

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The oven doesn't reach its proper temperature. So I took the temp. sensor out and measured the resistance. It was 960 ohms at RT. I went and bought a new replacement sensor (WB21X5301) and measured its resistance to be 1096 ohms at RT. The problem is I don't know if the sensor I had in the oven is bad or not. Is there a tolerance in the resistance measurements from one sensor to the next one? Or are they within a tight range?


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  #2 (permalink)  
Old 10-30-2009, 05:11 AM
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Cannot answer your question directly, it does seem a little low but that depends on the ambient temperature.
The sensors are not manufactured to a tight tolerance.
Hold the sensor in tightly in your palm, monitor the sensor with a meter.
The resistance should rise to 1140 ohms plus or minus 70 ohms.
I used the 70 ohms as most stoves allow a 35 degree control offset and 1 degree of change is 2 ohms.

I am assuming that the new probe did not fix your problem.
How do you know that it is not getting to the proper temperature?

A common cause of this is a blown element.
During preheat most units use both bake and broil elements, some units also switch back and forth between them.
Also many units now also switch back and forth during the bake, this is a way to keep the temperature consistent throughout the oven.

Perhaps someone else will be able to give you hard data on your question about sensor specs.

Note if you are using separate oven thermometer in the unit to measure the temperature where it is put can make a huge difference. Also a sensor with low resistance runs the oven hotter.
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Old 10-31-2009, 07:18 PM
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Thank you for your response. I didn't change the sensor because I wanted to confirm that the one I took out of the oven was indeed bad. i will check the resistance again using your method. Thank you again.

Quote:
Originally Posted by denman View Post
Cannot answer your question directly, it does seem a little low but that depends on the ambient temperature.
The sensors are not manufactured to a tight tolerance.
Hold the sensor in tightly in your palm, monitor the sensor with a meter.
The resistance should rise to 1140 ohms plus or minus 70 ohms.
I used the 70 ohms as most stoves allow a 35 degree control offset and 1 degree of change is 2 ohms.

I am assuming that the new probe did not fix your problem.
How do you know that it is not getting to the proper temperature?

A common cause of this is a blown element.
During preheat most units use both bake and broil elements, some units also switch back and forth between them.
Also many units now also switch back and forth during the bake, this is a way to keep the temperature consistent throughout the oven.

Perhaps someone else will be able to give you hard data on your question about sensor specs.

Note if you are using separate oven thermometer in the unit to measure the temperature where it is put can make a huge difference. Also a sensor with low resistance runs the oven hotter.
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