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HDC1080 humity heater usage

Other Parts Discussed in Thread: HDC1080, HDC2080

Hi,

during use of HDC1080 the sensor reached a huge offset of RH. I must be ~20% relative. In datasheet there is the chapter 8.3.3 - Heater. There is only written that this function is available. Question: How offen or when should it be used? And also how long?

Thanks für claryfing the topic!

Best Tino

  • Howdy Tino,

    In the event that the sensor is exposed to chemicals or particles, the device will report large offset. It is best to follow the correct storage and handling procedures, which can be found at the following:

    www.ti.com/.../snia025

    Can you let us know more about the environment that the device is sensing? You can use the heater, however its use is to drive off condensation. Currently, there is no study tied to the heater regarding it's ability to recover offset, and the application of it will require experimentation in the environment you are employing the device in.

    That being said, we have seen devices recover from large offset when they go through a bake/hydration procedure, this procedure is listed on page 30 of the HDC2080 datasheet and is applicable to the HDC1080 device.

    Best Regards,
    Matt
  • Thanks Matt,

    I understood now better the heater function. It's only to drive off condensation. Quite simple :-)

    The sensor is mounted on a LoRa board an measures RH + Temp from outside. It is not pretty good covered and I saw some dots with a microscope. I think the sensor pad itself is contaminated with something. Maybe a result in assembly... Next time we will take more care about this! Additionally I tried to heat up the sensor with solder fan (260°C) but without any effects.

    Other question: There are 30 weeks lead time at digikey of farnell. What happened?