Bosch Sensortec Community

    cancel
    Showing results for 
    Search instead for 
    Did you mean: 

    BME280 long term drift of readings

    Highlighted
    New Poster

    BME280 long term drift of readings

    I am running many BME280s in a moderate humidity environment (between 50% and 80%, at around 20C) and am seeing around 10% of the  units reporting more than 5% off of what our reference sensor reports in the same environment. We use a hand held sensor like this as our reference. Since these devices have been deployed for less than a year, there is concern that this drift is outside of what is characterized in the data sheet. Is there a more detailed aging reference available?

    4 REPLIES 4
    Highlighted
    Community Moderator

    Re: BME280 long term drift of readings

    It would be great to confirm that temperature output of all the devices are close together since relative humidity is temperature dependant. Would you be able to confirm if the reconditionning process has any impact on the output of new and older devices?

    Highlighted
    Community Moderator

    Re: BME280 long term drift of readings

    This difference should not belong to the long term drift which is considered by year. Our humidity sensor absolute accuracy achieve +-3RH% and you should consider the reference device accuracy error. So 5% is acceptable.

    Highlighted
    New Poster

    Re: BME280 long term drift of readings

    The temperature variance is within the stated accuracy from the data sheet.

    Highlighted
    New Poster

    Re: BME280 long term drift of readings

    I didn't express my experiment clearly:
    I measured the difference between reference and BME280 about a year ago, and measured an average over 20 units of approximately 3% well within the accuracy limits of both devices. Now, I measure the same units it and its coming in around 13%.

    Icon--AD-black-48x48Icon--address-consumer-data-black-48x48Icon--appointment-black-48x48Icon--back-left-black-48x48Icon--calendar-black-48x48Icon--center-alignedIcon--Checkbox-checkIcon--clock-black-48x48Icon--close-black-48x48Icon--compare-black-48x48Icon--confirmation-black-48x48Icon--dealer-details-black-48x48Icon--delete-black-48x48Icon--delivery-black-48x48Icon--down-black-48x48Icon--download-black-48x48Ic-OverlayAlertIcon--externallink-black-48x48Icon-Filledforward-right_adjustedIcon--grid-view-black-48x48IC_gd_Check-Circle170821_Icons_Community170823_Bosch_Icons170823_Bosch_Icons170821_Icons_CommunityIC-logout170821_Icons_Community170825_Bosch_Icons170821_Icons_CommunityIC-shopping-cart2170821_Icons_CommunityIC-upIC_UserIcon--imageIcon--info-i-black-48x48Icon--left-alignedIcon--Less-minimize-black-48x48Icon-FilledIcon--List-Check-grennIcon--List-Check-blackIcon--List-Cross-blackIcon--list-view-mobile-black-48x48Icon--list-view-black-48x48Icon--More-Maximize-black-48x48Icon--my-product-black-48x48Icon--newsletter-black-48x48Icon--payment-black-48x48Icon--print-black-48x48Icon--promotion-black-48x48Icon--registration-black-48x48Icon--Reset-black-48x48Icon--right-alignedshare-circle1Icon--share-black-48x48Icon--shopping-bag-black-48x48Icon-shopping-cartIcon--start-play-black-48x48Icon--store-locator-black-48x48Ic-OverlayAlertIcon--summary-black-48x48tumblrIcon-FilledvineIc-OverlayAlertwhishlist