Building a temperature well

Finally finishing up a project I started a few months back. This is a peltier junction temperature well for calibrating meteorological sensors.

Peltier cooled temperature well

The Peltier junction is controlled via an Omega PID controller, and utilizes an h-bridge for switching polarity to the cooler. An RTD sensor provides temperature feedback to the PID. This allows the well to be heated or cooled for different testing levels. I turned the well out of Aluminum, with a 1.50″ ID, so that it will receive off-the-shelf aluminum inserts for different sensors. The inserts can be drilled out to match whatever unit you have under test. I’m also going to make one insert that allows for propylene glycol baths.

This first unit was a bit of a science experiment. I will be building 2 more of these as “final” products for work, and for those I’ll lay out a circuit board to handle all the electrical connections, so that each component can be plug-able.
This unit is capable of -10C to +50C under normal conditions. Right now it has a 3-stage Peltier thermoelectric junction. I’m going to add another 3-stage unit. -50C is my goal for adjusting the offset on temperature sensors. If anybody is interested in one of these, I can make you one!

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  1. osama kamel January 3, 2014 at 12:26 pm #

    i hope that you build a new model now can go down to less than -30 C
    if yes please let me know its price

  2. Ashish May 28, 2013 at 8:19 am #

    Hi I was interested in your peltier temperature well. Wanted to check if you have built the -50 deg C model yet ??? I would be intereted in one of those for my laboratory. let me know if you can build one of these for me and at what cost. Thanks

    ashish –

  3. Ashish Gupta May 13, 2013 at 9:59 am #

    Hi We would be interested in such a Thermoelectric Well for Calibration of Metrological Sensors. We require the model which can go down to -50deg C .We do not require the outer casing and you can supply us the unit as ready to assemble with instructions. We will make our outer case ,aluminum well.
    Ashish Gupta

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