Less Gloppy Way to Good Thermal Contact in Multi Sensor Thermowell?

[velvetfoot]

The thermowell in my new boiler had two sensors in it. I think I can fit a third. Is thermal grease the only way to assure good thermal contact, or is there a less gloppy way? Maybe a homemade copper shim or copper wire to apply sideways pressure? There was no thermal grease when I looked at it and no cap on the well.

 

[Bob Rohr]

The thermowell in my new boiler had two sensors in it. I think I can fit a third. Is thermal grease the only way to assure good thermal contact, or is there a less gloppy way? Maybe a homemade copper shim or copper wire to apply sideways pressure? There was no thermal grease when I looked at it and no cap on the well.

Sure, good conductive contact is what is needed. The grease also elimiates any corrosion between the well and sensor which could hamper the conduction down the road. It serves multiple functions.

If you cut open a thermistor end you will find they a filled with a transfer compound to assure good "connection" it just a good practice to assure you have accurate, long lasting readings.

It is available in small quantities with easy to apply applicators if you search around.

The Dow 111 is and industry "go to" compound is a easy to use squeeze tube.

http://www.acousticpc.com/zalman_zm_stg1_thermal_compound.html