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Adapting a 3/8" temperature probe to a 1/2" well

Hello everyone, I purchased a buffer tank - I was expecting a 3/8" well - but the unit came with a 1/2" well. It's a closed tube - the probe is not exposed to the fluid in the tank. Can I just coat the probe with heat transfer paste, or is there a better approach? The probe is a special unit for chilled water that came with the control unit - I would like to use it.

Thanks for any comments or suggestions.

Ron
Energy Kinetics EK1
SpacePak 3 ton Chiller
Aircell Air Handlers

Comments

  • hot_rodhot_rod Posts: 11,790Member
    So the OD of the sensor is 3/8", and the well ID 1/2"?

    This is a common 1/2" well, 3/8 OD copper tube fits in just right. The ID of the copper is 5/16"

    Is it a 6 mm sensor? About 1/4" OD?

    If so I reduce those with a piece of 5/16 copper tune soldered inside 3/8" tube and you end up with a 6 mm or 1/4" ID well.'
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • RonnieJRonnieJ Posts: 33Member
    That's a great idea, Hot Rod - thank you!
    Energy Kinetics EK1
    SpacePak 3 ton Chiller
    Aircell Air Handlers
  • pecmsgpecmsg Posts: 854Member
    Depending on how quickly you want a response just transfer past is fine.

  • hot_rodhot_rod Posts: 11,790Member
    These 6 mm, 1/4" sensors are becoming popular, probably a Euro based size. All mod cons I have dealt with use this size thermistor. Same size on some of the electronic set point controls Ranco, etc.

    I use 5/16" OD copper tube, just egg shape the end a tiny bit to get a friction fit in the 1/2" well. The sensor is a nice fit inside once you ream the burr.

    I prefer silicone grease to that grey thermal paste. The grey stuff seems to harden over time and lock the sensor in the well.

    Thermistors seem more prone to failure compared to the old copper cap tube style sensor.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • RonnieJRonnieJ Posts: 33Member
    Thanks guys!
    Energy Kinetics EK1
    SpacePak 3 ton Chiller
    Aircell Air Handlers
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