Important Cookie Information

This website uses absolutely necessary cookies. If you consent to the use of convenience cookies, please click “Yes, I agree.” By clicking on “Privacy Settings.” you can change this setting at any time and withdraw your given consent. Icon down see more You can find detailled information in our Privacy Policy Icon forward-right
Icon up see less

Bosch Sensortec Community

    Showing results for 
    Search instead for 
    Did you mean: 

    Explanation of BSEC outputs

    Explanation of output of Bosch Software Environmental Cluster (BSEC) fusion library

    Bosch Sensortec provide the Bosch Software Environmental Cluster (BSEC) fusion library as one higher-level signal processing and fusion for the BME sensor.

    The library can be download from Bosch Sensortec webpage.

    BSEC output signals overview

    BSEC provides the output signals as follows:

    _Bosch magneto.png


    BSEC output signals details

    1. Sensor Raw data

    The raw pressure/temperature/humidity/gas resistance are the signal directly measured by BME680 sensors.

    2    Sensor compensated data

    The sensor heat compensated temperature/humidity provide the air temperature/ relative humidity compensated by the influence of sensor (heater) self-heating.

    The sensor compensated gas resistance provides the gas resistance compensated by temperature and humidity influences.

    3   IAQ and variant

    Indoor-air-quality (IAQ) [0-500] gives an indication of the relative change in ambient TVOCs detected by BME680, especially recommended for mobile devices, since the auto-trim algorithm automatically adapts to different environments.

    The static IAQ does not have the maximum value of 500 and is especially recommended for stationary devices (w/o auto-trimming algorithm).


     4       Additional outputs

    CO2 equivalents are the estimation of the CO2 level in ppm. This value is derived from the average correlation between VOCs and CO2 in human’s exhaled.

    The b-VOC equivalents are the conversion into breath-VOC equivalents in ppm concentration.

    Gas percentage is the alternative indicator for air pollution which rates the current raw gas resistance value based on the individual sensor history: 0% = lowest air pollution ever measured; 100% = highest air pollution level ever measured.

    5     Status indicator

    The Accuracy status is for IAQ defining the reliability of IAQ value. The meaning of the accuracy value is as follows:


    During normal operation, the accuracy indicator is expected to vary between 2 and 3 periodically during the day.

    The run in status indicates power-on stabilization status of the gas sensor element.

    The stabilization status indicates initial stabilization status of the gas sensor element.

    Version history
    Revision #:
    5 of 5
    Last update:
    ‎07-22-2019 11:16 AM
    Updated by:
    Labels (1)