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HDC2080: high temperature and humidity extremes

Alen Barisic
Intellectual 1300 points
Part Number: HDC2080
Other Parts Discussed in Thread: HDC1080

Hello,

the datasheet mentions the following:

«Reduce prolonged exposure to both high temperature and humidity extremes that may impact sensor accuracy.”

Could you quantify what is meant by:

1) prolonged - how long?

2) high temperature and humidity extremes - the sensor is specified with 0-100% and -20...125°C. Where are the limits for high temperature and humidity extremes

For our application: Could we measure temp and humidity at -20°C to 80°C without any damage to the sensor and any loose of accuracy )outside the tolerance from the diagrams)?

Thanks and kind regards,

Alen

  • +1
    TI__Guru* 90906 points

    Dear Alen -

    (1&2) These types of open cavity, polymer based sensors will be affected by conditions above 50C and 70%RH. The testing that is normally done on these is even more extreme and is at 85C/85%RH (which should never exist in the real world, but is done to many industrial end equipments for reliability testing.

    This testing has shown permanent offset impact in as little as 12 hours of about 3% and testing same conditions for 500 hours can lead to permanent offset of about 15%. There is a table in HDC1080 datasheet (Table 10, page 19) which would apply to the HDC2 parts as well, and it has been observed that our devices are not unique in these results and also please note these extreme conditions must exist at the same time. 

    (3) - It does not make much sense to measure %RH below 0C, and the sensor is rated to operate best between -40 to 85C and is functional up to 125C, but it makes little practical sense to measure %RH at or above 100C.