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HDC3022-Q1: Measuring the humidity of urethane resin

user5163865
Genius 3980 points
Part Number: HDC3022-Q1
Other Parts Discussed in Thread: HDC3022

Tool/software:

Hi,

Measuring humidity in urethane resin Automotive equipment is often waterproofed by filling it with urethane resin.
Our customer is planning to use this method to measure the humidity in urethane resin on a board equipped with HDC3022-Q1.
Is it possible to measure humidity without any problems even if the IP67 cover is molded with urethane resin?
Because urethane resin itself is hygroscopic, the customer wants to measure humidity from the inside with this sensor.

Best regards,
Hiroshi

  • 0
    TI__Genius 12185 points

    Hiroshi-san,

    If you are using the HDC3022-Q1 with any sort of conformal coating or resin deposition during assembly, the customer must manually apply some sort of Kapton or polyimide tape on top of the PTFE filter, so that the resin does not coat the filter. If the filter is coated by the resin, the cured resin will block moisture from entering the sensor, rendering the HDC3022 useless. Have the customer apply the tape cover (likely have to manually cut small squares of tape and apply to each sensor prior to assembly) prior to assembly, deposit the resin, let the resin cure, then remove the tape so that the IP67 filter is uncovered. This way, it can still sense RH properly.

    Just so I understand, is this customer trying to sense humidity in the air with this urethane resin as a PCB coating? Or are they trying to dunk the HDC3022 into the resin and read RH? I don't think the sensor will work properly is not trying to sense RH in air.

    Thanks

    -Alex Thompson

  • 0 in reply to Alex Thompson
    Genius 3980 points

    Hi Alex-san,

    Our customer is trying to measure the humidity of filled urethane.

    As you say, this idea may be difficult, but we will have the customer evaluate it and then decide whether to adopt it or not.

    Best regards,

    Hiroshi

  • 0 in reply to user5163865
    TI__Genius 12185 points

    Hiroshi-san,

    Thank you for the clarification. As the customer performs their evaluation, please reply on this thread with their results, I am very interested to see what they encounter.

    Thanks

    -Alex Thompson