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Temperature sensor on Peltier TEC

Temperature sensor on Peltier TEC

Temperature sensor on Peltier TEC

(OP)
Good morning,

I have one Peltier TEC element (40 x 40 x 3.2mm) sandwiched between 2 waterblocks for cooling / heating. In what way can I mount a temperature sensor to measure the temperature of the FACES of the Peltier element? I need to monitor Tcold and Thot to find the optimum working point of the device. For the sensor part I am using a DS18B20 digital sensor in a TO92 case. One idea that I have is to sandwich in between the Peltier and the waterblock one more copper block 10mm thick into which I drill a hole to fix and glue the sensor with thermal compound adhesive.

Do you have any other ideas that might work ?

Thank you!

Best regards,

Costin Ruja

RE: Temperature sensor on Peltier TEC

Is that package cast in concrete? The temp sensor supposedly has a uSOP package that is much smaller.

In any case, can you put a depression in the water block face? That's probably a better representation of the temperature

TTFN (ta ta for now)
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RE: Temperature sensor on Peltier TEC

(OP)
@IRstuff,

I'll have to cut a section through the waterblock to see where are the channels and how thick the copper is, maybe I can mount it directly.

I'll have to get my hands on that peltier element and measure how thick the ceramic plates are, another idea is to glue the sensor to the side of the plate.

Best regards,

Costin Ruja

RE: Temperature sensor on Peltier TEC

I sure wouldn't use those monstrosities to try to monitor that setup.

If this is just testing by all means use thermocouples. You can get minuscule ones that will move like they're rocket powered! And, they won't alter the temperature of the blocks themselves. Cram them against the edges of the TEC plate touching the water blocks. Put a dab of silicone on them to isolate them from the air. Nothing else will move as fast. You could also drill a tiny hole laterally into the water blocks below the TEC plates not puncturing the water blocks under the TEC plates. The teensy T/Cs can then be run down the tiny drilled holes.

If you need this for production... you've got your work cut out for you.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Temperature sensor on Peltier TEC

(OP)
It's certainly not for production, yet! It's for personal research. I'm trying to optimize the working point of the Peltier cell in order to maximize the thermal COP. In order to do that I need the deltaT of the faces. I'll have to build a compact solution using waterblocks on both sides and probably fully insulated as good as I can get, maybe cast in insulating foam. Tomorrow i'll get my hands on the peltier element and watercoolers, probably i'll destroy them to find some good spots to mount the sensors.

Best regards,

Costin Ruja

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