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Can I measure the temp with TMP006?

Dong-ho Lee
Prodigy 10 points
Other Parts Discussed in Thread: TMP006

I want to measure the temp of heating water with TMP006.

The measuring structure is like below.

 

The water is between the heater and TMP006, and the heater faces the TMP006.

Like this structure, can I measure the temp of water accurately?

Is there any effect of heater emitting IR?

  • 0
    TI__Expert 7945 points

    Hello Dong-ho,

    Yes, you can measure the temperature of water accurately(water is highly IR emissive), as per your diagram, as long as you meet the following conditions:

    1. Container holding the water is IR transparent

    2. Water level that is in the container needs to be above the TMP006 level, otherwise it will measure the heater temperature since the container is IR transparent.

    If it is feasible I would recommend placing TMP006 on top of the water container (like a cap), overlooking the water, this way you may not need to worry about the containers IR transparency.

    I hope this helps!

    Best regards,

    Abhi

  • 0 in reply to Abhishek Muppiri
    Guru 85655 points

    @Abhishek,

        How about if I want to measure the water temp of an aquarium. Would I be able to measure temperature of the water of the aquarium, if I put the tmp006 against the outside aquarium glass?

    - kel

  • 0 in reply to Markel Robregado
    Guru 22270 points

    Hello Markel,

    I would say that the sensor would not be able to give you the temperature of the water.  Unless you have a specially built tank with high IR transmissivty, you would be measuring the temperature of the outside air.  Standard glass blocks IR and the glass itself acts as an insulator.  You would have to place it above the tank as Abhi mentioned for the original post.

    Now if your tank was plastic and didn't contain any UV or IR blocking ingredients, coatings or stabilizers, then you would be able to get an accurate reading of the water inside.

    Thanks,

  • 0 in reply to Greenja
    Guru 85655 points

    @Greenja,

        Thanks for your reply.

        I thought it is possible to measure the aquarium water temperature by putting the tmp006 against the outside glass wall of the aquarium. Since, the temperature of the aquarium water is radiating at the aquarium glass, I thought that the aquarium water temperature would be the same as the aquarium glass, theoretically.

        If using the SensorTag, maybe it is possible to measure aquarium water by pressing the SensorTag against the outside glass wall of the aquarium.

    - kel

  • 0 in reply to Markel Robregado
    Guru 22270 points

    Hello Markel,

    You can use the SensorTag to measure the temperature of the Glass.  By pressing the SensorTag against the glass you would be using the SHT21 sensor which measures Humidity and Temperature, not the TMP006 which uses IR.

    Theoretically speaking, the water and glass should be at the same room temperature.  However, if the Aquarium is in direct sunlight, or the water goes through an aerator, or your air bubbler is adding hot air to the water, etc., you would not be getting an accurate reading.  

    For little fishies, this isn't a problem.  If you are trying to make a new claim on the Meisner Effect, it is critical :).

    Thanks,

  • 0 in reply to Markel Robregado
    TI__Expert 7945 points

    Hello Markel,

    Glass in general has high emissivity due to which TMP006 will measure the glass temperature but not the water temperature when placed against the outside aquarium glass. 

    Regards,

    Abhi

  • 0 in reply to Markel Robregado
    Prodigy 10 points
    The glass is in direct contact with the water and if heat flux across the glass is small (it is, because the heat flow to the air is small!) then the glass is at essentially the same temperature as the water inside. If the glass does not have high enough emissivity, paint a small patch of it matt black and use the TMP006 to look at that area.