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Sensor Forum Temperature sensor to put into water
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Forum Thread Details
  • Replies 11 replies
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  • water_proof
  • temperature sensor
Related

Temperature sensor to put into water

koudelad
koudelad over 7 years ago

Hello,

 

I would like to ask for recommendation of a temperature sensor to put into water. I have two household (amateur) applications in mind, one for drinkable and one for non-drinkable water. Temperature range is between ca. -10 and +120 centigrade, precision needed ca. +/- 1 centigrade. Something with a one or two meter cable would be perfect.

 

I was thinking about some DIY variant, but I am afraid of adding unnecessary thermal capacity to the sensor and shifting the original scale off. Last time I used LM75A LM335, just the non professional solder joints shifted the measured value to ca. -4 centigrade.

 

Thank you,

David

 

EDIT: I meant analog output LM335.

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Top Replies

  • mcb1
    mcb1 over 7 years ago +3
    I've always stayed away from using analogue sensors. One reason is the scale is not always linear ... well at least in the product I fixed with them in. I tend to always head to the DS18B20 with it's waterproof…
  • jw0752
    jw0752 over 7 years ago +2
    Hi David, If you are serious about the need for measuring temperatures above 100 degrees C you may need to go to a sensor like those used in sterilizers. https://www.rpiparts.com/PartPage.asp?equip=2&oem…
  • ninjatrent
    ninjatrent over 7 years ago in reply to mcb1 +2
    I just purchased a waterproof DS18B20. It cost about US$10
Parents
  • jw0752
    jw0752 over 7 years ago

    Hi David,

    If you are serious about the need for measuring temperatures above 100 degrees C you may need to go to a sensor like those used in sterilizers.

     

    https://www.rpiparts.com/PartPage.asp?equip=2&oem=50&model=262&rpinum=PCT135

     

    You will not be able to heat water over 100 degrees C without having it in a pressure vessel.

    John

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  • jw0752
    jw0752 over 7 years ago

    Hi David,

    If you are serious about the need for measuring temperatures above 100 degrees C you may need to go to a sensor like those used in sterilizers.

     

    https://www.rpiparts.com/PartPage.asp?equip=2&oem=50&model=262&rpinum=PCT135

     

    You will not be able to heat water over 100 degrees C without having it in a pressure vessel.

    John

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  • koudelad
    koudelad over 7 years ago in reply to jw0752

    Thank you, John.

     

    I also stumpled upon these ready-made sensors:

    https://www.ebay.com/itm/NTC-10K-Thermistor-Temperature-Sensor-M8-Thread-Probe-Cable-1m-2m-3m-Waterproof/232603039674?hash=item362838b7ba:m:m86Kk2vDmxtujCBbsid7TPA

     

    https://www.ebay.com/itm/RTD-Pt100-Temperature-Sensor-2m-Cable-Stainless-Probe-100mm-3-Wires-50-500/131876303564?epid=1639119260&hash=item1eb470b2cc:g:SA0AAOSwg3FUohjz

     

    I am just not sure, if they are reliable. Whether the manufacturer copied just the form of another product and it will corrode in a week, or it is similar to something more expensive.

     

    I don't have a very good experience with Chinese no name electronics, but I guess similar products made by well known manufacturers will cost at least 10 times more.

     

    David

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