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I've had my eye on these Thermowells for quite a while. I somewhat recently emailed to find out what the dimension of the Thermowells are and this is the answer I received:
The entire piece is 1-7/8" long.
Half of the probe is 1/4" in diameter and the other half is 7/16" in diameter.
The "well" that accommodates the probe is a 4mm (1/8th strong) diameter and about 3/4" deep.
This depth is commensurate with the probes that are included with our thermometers but can also be drilled out an additional 1/4" if needed. The "well" can also be widened if needed to accommodate a larger diameter probe.
Well based on the description & the dimensions I drew the Thermowell. Here's what I drew.
Now I'm kinda confused and would love to have some clarification. Is this accurate? If so, why all the wasted space & extra material? Does all this extra material serve to conduct heat to the sensor and does not need to be drilled out (or shouldn't)? Is it made this way so that the customer can cut off the unused portion or drill it out in order to push the probe deeper into the Thermowell?
I was not expecting the Thermowell to be made this way. I suspect that no one really would. The only reason I emailed & asked about it was because there was not anything in the way of a description and it leaves everything to the customer's imagination.
I'll be ordering at least a few very soon because these are the first Thermowells I've found that actually fit 4mm sensors like the 3-wire RTD probes from Auber Instruments. Most others differ in ID and are much larger in ID.