How can I seal a temperature sensor against water?

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How can I seal a temperature sensor against water?

Postby mozobata » Thu Jul 06, 2017 2:25 am

I have some DS18B20temperature sensors around and was wondering how can I seal them and use them in a water tank. The sensor must include a small resistance (140 k or so).Here is the ds18b20 datesheet

Is there a simple DIY way to do it? it need to be something with a small thermal resistance/capacity.
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Re: How can I seal a temperature sensor against water?

Postby evasive » Fri Jun 08, 2018 4:45 am

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Re: How can I seal a temperature sensor against water?

Postby Karlsweldt » Fri Jun 08, 2018 7:06 am

You could also get some thin plastic tubing that the sensor just fits into snugly. Put heat-shrink tubing on lead connections to prevent shorts, feed the wires into the tube.. long enough to prevent liquids from getting in the other end. Push the sensor into the tube maybe 1/2 inch, then heat and seal the end of the tube so it fuses solid. The other end could be heated and squashed a bit too, with the wires flattened out, maybe 1/2 inch in.
That DS18B20 sensor is available in a factory-made waterproof model, with a stainless steel sensor end and long plastic sheath.
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Re: How can I seal a temperature sensor against water?

Postby Mr T » Sun Jun 10, 2018 9:14 am

Try something likethis. Put a glob over the sensor, let it dry and it should do the trick.
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