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HDC1050 / recommended humidity operating range

K.Yaita
Guru 29710 points
Other Parts Discussed in Thread: HDC1050

Hi team,

The HDC1050 datasheet(page.5) shows the following.



I would like to ask 2 questions.

1)
How long is the time duration about "Prolonged operation"?
I would also like to ask how much offset is occured when 80%RH.
Is there any data about it?

2)
>The measurement offset will decrease after operating the sensor in this recommended operating range.
Could you tell me the recovery time?
(How long is required to decrease the measurement offset?)

Best Regards,
Yaita / Japan disty

  • 0
    TI__Expert 5145 points

    Dear Yaita-san,

    1) "Prolonged operation" means that the sensor is exposed to an environment with RH higher than 80% for several hours. In this condition the offset might increase up to 15%. Unfortunately we don't have, at the moment, any data that can be shared with the customers regarding this effect.

    2) The recovery time from the situation described at the previous point is strongly related to the environmental condition. For example, if the sensor is exposed at Low Humidity (20% HR), the recovery time is in the order of several days.

    Let me know if this answers to your questions

    Best regards,

    Carmine

  • 0 in reply to Carmine Iascone
    Guru 29710 points

    Hi Carmine-san,

    1) Could you tell me the detail condition (ambient temperature etc.) if the offset might increase up to 15%?
    The datasheet shows ±5%RH TYP@80%RH accuracy under Ta=30℃.



    2) I understood if the sensor is exposed at Low Humidity (20% HR), the recovery time is in the order of several days.
    Is 20%RH you said the worst condition for recovery time in the recommended operating range(20% to 60%RH)?

    Best Regards,
    Yaita / Japan disty

  • 0 in reply to K.Yaita
    TI__Expert 5145 points

    Dear Yaita-san,

    1) The plot in the DS shows the accuracy of the HDC1050 in all the range 0%-100%  with the assumption that the device was not previously subjected at prolonged operation outside the recommended humidity range (20% to 60% RH). The same measurements for a device that has been exposed for several hours at high humidity (more than 80%) will show a similar behaviour but shifted upward of about 10% RH. As already explained, this further offset can be recovered if the device is kept in the recommended operating range for long time.

    2) No, the 20%RH is the best condition for the recovery from prolonged operation at high humidity (above 80%). On the other side, 60%RH is the best condition for the recovery from prolonged operation at low humidity (below 10%).

    Let me know if this answers to your questions

    Best regards,

    Carmine