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TMP108 Gus-temp measurement

cafain
Mastermind 6755 points
Other Parts Discussed in Thread: TMP108

TMP108

It is scheduled to application of design to measure the gas at the sensor.

Ask about TMP108 in Q1～Q3.

I ask of you, a comment.

Q1:There is humidity in target(Gus,air-type) for measurement. 　

      When applying a desiccant the sensor body, is there a problem with temperature measurement?

Q2:Fluid (gas) do you have experience in?

Q3:When the package is different, Is there a difference in temperature sensing?

Best regards

  • 0
    TI__Mastermind 34220 points

    Hi Cafain,

     

    A1: Not sure I understand this question. Can you elaborate what you mean by “applying desiccant the sensor body”? Do you mean covering TMP108 with desiccant? The sensor measures the temperature of whatever it is in contact with, be it solid or liquid. It is assumed that target object is in contact with the sensor in order to accurately measure its temperature. We measure air temperature with no special precautions.

    A2: I don’t have experience measuring gas temperature other than air; however we routinely test them in electrically non-conductive liquid. Since TMP108 is in WCSP, it might be good candidate for gas temperature (with humidity) sensing. But there are probably peculiarities about gas sensing that I’m not aware of.

    A3: Package type should not affect temperature sensing. Response time may be slightly different since the thermal mass will be slightly different.

     

    What is the temperature range, RH and fastest rate of temperature change of the targeted gas?

     

    Regards,

    Guang-Apps Sensing Products

  • 0 in reply to Guang Zhou
    Mastermind 6755 points

    Hi

    Inquiry contents in the poor, it is not sorry.

    The gas to be measured, to you, but there is a small amount of moisture.

    In order to protect the sensor from the water, you need to apply a moisture-proof agent (for example epoxy).

    (package attached to probe(PCB) tip with thermally conductive epoxy)

    If you have painted the epoxy to the entire device (terminal included), if there is any trouble in the temperature measurement, I want to make sure.

    Best regards

  • 0 in reply to cafain
    TI__Mastermind 34220 points

    Hi Cafain,

     

    Whether the proposed application is feasible really depends on the individual requirements, it is hard to say yes/no in general terms. I think it is OK to cover the device including the pins with thermally conductive epoxy and submerge the entire fixture inside the gas to be tested.

     

    The epoxy, however conductive, is probably not as good as metal, and should be considered as an added thermal resistance. A settling time has to be budgeted for thermal equilibrium to be reached after a sudden temperature change. You’ll probably need to conduct some initial experiment to determine how much time is needed to reach that point.

     

    Regards,

    Guang-Apps Sensing Products