Bosch Sensortec Community

    cancel
    Showing results for 
    Search instead for 
    Did you mean: 

    BME680 Gas Sensor Accuracy for VOC

    pennygoesaround
    New Poster

    BME680 Gas Sensor Accuracy for VOC

    I have a question regarding the VOC accuracy. I was looking online, it seems that there is a variable called BSEC_OUTPUT_BREATH_VOC_EQUIVALENT that will give me the concentration VOC in ppm. Assuming I am interested in measuring the concentration of ethanol (2 ppm at most), what's the accuracy of the measured value? 

    In the data sheet, it mentions Sensor-to-sensor deviation +/- 15% +/- 15. Does it mean the accuracy of the measused VOC concentration will be BSEC_OUTPUT_BREATH_VOC_EQUIVALENT*0.15 +/- 15?

    1 REPLY 1
    FAE_CA1
    Community Moderator

    Re: BME680 Gas Sensor Accuracy for VOC

    Hi,

    Thanks for your inquiry.

    In BME680 datasheet the typical IAQ deviation from sensor to sensor is +/-15% +/- 15. The IAQ value [0, 500] is the output of BSEC library. If the reference meter shows IAQ of 200 for example, then the IAQ error from BSEC should be in the range of [-45, +45] which means that the IAQ output of BSEC should be in the range of [155, 245].

    The accuracy of bVOC which is another output of BSEC in the range from 0.5ppm to 1000ppm is not defined or specified.

    Thanks.

    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