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Help to find thermistor beta constant value.

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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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