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Temp Sensor Recalibration?

post #1 of 33
Thread Starter 
Hey guys.
It would take too long to explain why I need this, so I'll skip that part.

I need 2 of my temp sensors to read 25° C when the temperature is actually 20° C.
Now, I understand those tenp sensors are of the resistive kind.
And so they should not be cut down, or extended, as that would change the resistance, and change the temp reading.

Anybody knows here, if I can just cut or extend a sensor to trick it into reading 5° C above the actual temp?

Should I cut the sensor shorter? Or make it longer?

Anyone has any knowledge on this matter?

I don't even know if resistance goes up or down with heat???
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post #2 of 33
i know making the wire length longer would raise its resistance. its probably a trial and error thing.
good luck getting a 'definitive' answer.
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post #3 of 33
Temp sensors use 10 000 Ohm resistors. The resistance of wire is a tiny fraction of that so extending the wire or shortening it does not make enough of a difference to change readings.
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post #4 of 33
Thread Starter 
Quote:
Originally Posted by Jakusonfire View Post

Temp sensors use 10 000 Ohm resistors. The resistance of wire is a tiny fraction of that so extending the wire or shortening it does not make enough of a difference to change readings.

So I 'd have to find out how much resistance 5° C makes, and just add a resistor to simulate that 5° C, right?
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post #5 of 33
Not sure about the common PC temp sensors but some thermistors drop in resistance as temp increases so adding resistance would only lower temps.

Trying to get around the minimum temp of the CW611?
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post #6 of 33
Thread Starter 
Quote:
Originally Posted by Jakusonfire View Post

Trying to get around the minimum temp of the CW611?
Yup!
Pretty good crystal ball you got there mate.
I guess you contemplated the same idea?
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post #7 of 33
Quote:
Originally Posted by PepeLapiu View Post

Anybody knows here, if I can just cut or extend a sensor to trick it into reading 5° C above the actual temp?
Should I cut the sensor shorter? Or make it longer?
Anyone has any knowledge on this matter?
I don't even know if resistance goes up or down with heat???

Unless it is electronic (which it most likely won't be) resistance goes up with temperature, however it isn't always a linear relationship. In theory you should make it longer, however as Jakusonfire pointed out you would have to make it significantly longer to have the desired effect.

A resistor would do the trick, however you would have to work out which size. An easier method would be to get a cheap potentiometer (variable resistor) and use that - then you can adjust the resistance to suit.
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post #8 of 33
Thread Starter 
Here's what I found on kiwipedia:
Quote:
Near room temperature, the resistivity of metals typically increases as temperature is increased
So to make 20° C fell like 25° to the sensor, I'd have to increase resistance.

I think I'll just try and experiment with some wire that has bad conductivity.
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post #9 of 33
Thread Starter 
Quote:
Originally Posted by GingerJohn View Post

Unless it is electronic (which it most likely won't be) resistance goes up with temperature, however it isn't always a linear relationship. In theory you should make it longer, however as Jakusonfire pointed out you would have to make it significantly longer to have the desired effect.

A resistor would do the trick, however you would have to work out which size. An easier method would be to get a cheap potentiometer (variable resistor) and use that - then you can adjust the resistance to suit.

Great idea!
Thanx!
thumb.gif
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post #10 of 33
http://wiki.reuseum.com/_media/TTF3A103_tw.pdf
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