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Thermocouple must be mounted to heatsink with glue blob?

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treez

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Hi,
Our new contractor has tried to measure the temperature of a heatsink with a thermocouple mounted as attached.
We do not like this. We believe that it really needs a glue blob around it to attach it to the heatsink.
In the attached picture, you can see that there is only a "Point contact" of the thermocouple junction to the heatsink.
The rest of the end bit of the junction is in air, with air currents possibly flowing around it and cooling it.
As such, we believe that this kind of setup will result in an overly low reading of heatsink temperature...do you agree?
 

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    Thermocouple mounting.jpg
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I agree; you need a bob of glue on the tip of the TC junction. That will reduce (partly only) the local cooling caused by the thermal loading. Also use the thinnest wire available. However, the heat sink is massive and the temp load will be rather low.
 
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    T

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Hi,

When the wires are mounted close to the heatsink, in a way that the ambient temperature can't cool the wires, then the error won't be high.

A simple test with two thermocouples, one with and one without glue will show you the difference.
It doesn't take much time...

Klaus
 

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