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HDC1080: HDC1080 / Effect of sweat on sensor

weiji jiang
Expert 2040 points
Part Number: HDC1080
Other Parts Discussed in Thread: HDC2010

Hi TI Folks,

  Good day to you.

  Considering to design a wearable product with HDC1080 / HDC2010, need to clarify how much effect when sweat appears / stick on its sensor area:

  • 1. How much effect on Temperature reading?  (estimated how many percentage shift?)
  • 2. How much effect on Humidity reading? ( estimated how many percentage shift?)
  • 3. Will the sweat on sensor effect the HDC1080 lifetime ?

  Two more question are, after the sweat on sensor is dry,

  • 1. Will the remain material effect the lifetime of HDC1080?
  • 2. Will it effect the accuracy on temperature and humidity measurement ?

Best regards.

Jiang WeiJi

  • 0
    TI__Expert 5145 points

    Hi Jiang,

    I'm sorry, but we have not performed any test on sweat.

    Let me figure out with the HDC's designers if the sweat can impact the performances of the sensing element, and I will be back to you.

    Thanks in advance for the patience.

    Best regards,

    Carmine

  • 0 in reply to Carmine Iascone
    Expert 2040 points
    Hi Carmine,

    Is there any update ?

    best regards
    Jiang WeiJi
  • 0 in reply to weiji jiang
    TI__Expert 5145 points

    Hi Jiang,

    We had and internal discussion regarding your questions and we think that if the sweat goes in contact with the sensing element, there are two effects:

    1. short term effect: the sweat can saturate the sensing element, and the RH% value should be 100%. Due to the fact that the HDC1080 is able to autodetect the condensation, its output will read 0%RH until the sweat will be in contact with the sensing element;
    2. long term effect: long exposure to contaminants like soap, perfume, deodorants or detergents that are present, even in small measure, on the skin, could damage the sensing element, and impacting on the accuracy of the device.

    Probably the best solution is to try to cover the opening of the sensor with a waterproof material, like for example a Gore-Tex tape.

    Please let me know if this replies to your questions.

    Best regards,

    Carmine

  • 0 in reply to Carmine Iascone
    Expert 2040 points
    Hi Carmine,
    Good day to you.
    Thanks for your information.
    When sweat is contact with the sensing element, can we clean it manually? if can do, what is the correct cleaning way? please share more about this..

    Best regards.
    Jiang WeiJi