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Help to find thermistor beta constant value.
rvalente:
Hello Mates,
I`m trying to find a similar thermistor for my fridge (Bosch KDN43), from a similar service manual (which use the same sensor probe) I've found these values:
The B25/100 constant should be the same for B-10/40 or B0/30? This is not clear to me, I`ve found the below constants:
Well, I`m clearly missing something, can someone help me?
Points from service manual
T °C R
40 3000
35 3500
30 4100
25 5000
20 6000
15 7800
10 9300
5 10700
0 12800
-5 16000
-10 24000
-15 34000
-20 45000
Constants:
β25/-20 3681
β40/-10 3424
β25/0 3059
β25/10 3489
β25/20 3184
β25/30 3584
β25/35 3274
β25/40 3176
β40/-20 3574
iMo:
3578
rvalente:
Can you please explain me how you got to that number?
T3sl4co1l:
Right, beta is an incomplete description of the real behavior of NTC thermistors. So it varies with what points you pick.
Anything with a value in that neighborhood will do, and you can check datasheets for actual curves/data to find one that matches best.
Tim
rvalente:
Right...
so in this case, I have only these points. Which of them should I pick to find a close replacement?
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