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Sensors
Sensor Forum Please help me to choose cable to extend TO-92 sensor legs
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  • TO-92
  • cable lead
Related

Please help me to choose cable to extend TO-92 sensor legs

HKPhysicist
HKPhysicist 9 months ago

Hello E/E Engineers,

I am in the way of choosing cables to extend this TO-92 type temperature sensor legs so that I can place it under the target battery or even extend it into a refrigerator / freezer.

MCP-9700A

I know there is out-of-box 1-wire sensor packaged with long cable lead but the part`s origin is in question.  I must create this by myself so that I have the part`s origin documents.

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Top Replies

  • michaelkellett
    michaelkellett 9 months ago in reply to HKPhysicist +4
    That isn't a problem. You can calculate exponentials on pretty much any modern micro but its a little slow. If you want to conserve power or time then precalculate third order polynomial coefficients from…
  • rsc
    rsc 9 months ago in reply to HKPhysicist +3
    Since the drain wire is connected to the shielding, it's more of a ground than a shield, but since the other wires are twisted pair it should work..
  • kmikemoo
    kmikemoo 7 months ago in reply to HKPhysicist +3 suggested
    HKPhysicist You can always go with one of the Maker's best friend - hot glue. That's what I used way back in 2021 during Build Inside The Box . I'm not sure how much it will shrink in the cold, but at…
Parents
  • HKPhysicist
    0 HKPhysicist 7 months ago

    Hello Friends,

    I am on the way of composing my temperature sensor with extended cables.  I have chosen these 2 components:

    https://hk.element14.com/microchip/mcp9700a-e-to/thermistor-linear-0-01v-c-to-92/dp/1332164

    https://hk.element14.com/van-damme/268001cl/cable-1pair-black-per-m/dp/2425036

    These are my planned steps:

    1. To solder the 3 legs of the MCP-9700A sensor to the 3 separate cores of my chosen signal cable.
    2. I am looking for an insulating sealant or adhesive to seal all 3 solder joints and exposed cable leads in one step.
    3. Let the sealant or adhesive to dry.
    4. Finally, seal all the 3 joints with a wider heat-shrink tube to protect the signal cable and MCP-9700A leads.

    Right now, I am stuck at step 2.  Could you recommend me an insulating sealant or adhesive suitable for step 2?  Fast drying (for example, within 5 minutes) is preferred.

    Thanks for your valuable experiences.  TophatBlush

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  • anniel747
    0 anniel747 7 months ago in reply to HKPhysicist

    Epoxy or UV?

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  • shabaz
    0 shabaz 7 months ago in reply to anniel747

    I sometimes use what I believe is nail adhesive, it's thick as if it were a clear type of putty, with a UV torch. Very convenient!

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  • shabaz
    0 shabaz 7 months ago in reply to anniel747

    I sometimes use what I believe is nail adhesive, it's thick as if it were a clear type of putty, with a UV torch. Very convenient!

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  • anniel747
    0 anniel747 7 months ago in reply to shabaz

    shabaz You may be right that the same UV adhesive is marketed for many uses.

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