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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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  • 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
  • mcb1
    mcb1 over 7 years ago

    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 connection.

    Terry has them on sale at the moment.

    Waterproof DS18B20 stainless steel encapsulated temperature sensor 1M Cable

     

    Your +120 C will be difficult without containing the pressure as jw0752 said.

    You can use a gland nut to tighten around the body, and I've seen the unprotected version (with a good blob of thermal transfer paste) fitted into a probe which was sealed.

     

    The thermal mass is not going to be an issue as you're measuring water, and unless you're trying to detect temperatures in small flows, it will follow the water temperature with very little lag.

     

    Mark

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  • ninjatrent
    ninjatrent over 7 years ago in reply to mcb1

    I just purchased a waterproof DS18B20.

    image

    It cost about US$10

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  • mcb1
    mcb1 over 7 years ago in reply to ninjatrent

    I've always purchased mine from Terry King at Yourduino.

    Waterproof DS18B20 stainless steel encapsulated temperature sensor 1M Cable

    Because there is a small freight charge, I tend to buy more than one at a time.

     

    Mark

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  • mcb1
    mcb1 over 7 years ago in reply to ninjatrent

    I've always purchased mine from Terry King at Yourduino.

    Waterproof DS18B20 stainless steel encapsulated temperature sensor 1M Cable

    Because there is a small freight charge, I tend to buy more than one at a time.

     

    Mark

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