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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
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  • jw0752
    jw0752 over 7 years ago

    Hi David,

    In your situation I would look for an existing device from which I could take a sensor. For example here is an indoor/outdoor thermometer that could be used as a source for a sensor.

    https://www.banggood.com/LCD-Digital-Thermometer-Humidity-Meter-Hygrometer-Indoor-Outdoor-p-910390.html?rmmds=search

     

    The out door sensor, which is well sealed and has a relatively small thermal mass could be removed and repurposed for your application. You would still have the other features of the device that could be used as is or you could parts it out for other projects.

     

    John

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  • jw0752
    jw0752 over 7 years ago

    Hi David,

    In your situation I would look for an existing device from which I could take a sensor. For example here is an indoor/outdoor thermometer that could be used as a source for a sensor.

    https://www.banggood.com/LCD-Digital-Thermometer-Humidity-Meter-Hygrometer-Indoor-Outdoor-p-910390.html?rmmds=search

     

    The out door sensor, which is well sealed and has a relatively small thermal mass could be removed and repurposed for your application. You would still have the other features of the device that could be used as is or you could parts it out for other projects.

     

    John

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