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    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.

    https://www.bosch-sensortec.com/

    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).

    1.png

     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:

    2.png

    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:
     
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