Datasheet
Bosch Sensortec | BME680 Datasheet
9 | 50
Modifications reserved |Data subject not change without notice | Printed in Germany
Document number: BST-BME680-DS001-00 Revision_1.0_072017
Table 3: IAQ system parameter specification
3
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Accuracy status
4
AX
IAQ
Android compatible
0
3
IAQ Resolution
IAQ
rs
1
IAQ Range
IAQ
rg
0
500
Sensor-to-sensor
deviation
5
IAQ
S2S
All operation modes
±15%
±15
Durability to
siloxanes
6,7,8
IAQ
S2S
Sensor-to-sensor deviation
±15%
±15
IAQ
drift
Drift at low & high
concentrations
±1%
±4
Table 4: Indoor air quality (IAQ) classification and color-coding
9
IAQ Index
Air Quality
0 – 50
good
10
51 – 100
average
101 – 150
little bad
151 – 200
bad
201 – 300
worse
2
301 – 500
very bad
Table 5: bVOC mixture with Nitrogen as carrier gas
Molar fraction
Compound
Production tolerance
Certified accuracy
5 ppm
Ethane
20 %
5 %
10 ppm
Isoprene /2-methyl-1,3 Butadiene
20 %
5 %
10 ppm
Ethanol
20 %
5 %
50 ppm
Acetone
20 %
5 %
15 ppm
Carbon Monoxide
10 %
2 %
3
IAQ parameters only apply for the combination of BME680 together with the Bosch Software Environmental Cluster (BSEC) solution (available separately, see Chapter 4)
4
The accuracy status is equal to zero during the power-on stabilization times of the sensor and is equal to 3 when the sensor achieves best performance
5
Tested with 0.6–90 ppm of EtOH at 5–40 °C, 20–80% r.H. and atmospheric pressure. Condition is valid after the calibration period of the BSEC algorithm.
6
Siloxanes are present in a typical indoor environment and can in principle perturb the metal-oxide-based gas sensor performance.
7
220 hours of 700 mg/m
3
of octamethylcyclotetrasiloxane (D4) in ambient conditions (i.e. 20 °C and 50% r.H.) simulates the amount of siloxanes in a typical indoor environment over more
than 10 years.
8
Tested with 0.5–15 ppm of b-VOC at 20 °C and 50% r.H. using continuous operation mode for 220 hours of 700 mg/m
3
of octamethylcyclotetrasiloxane (D4).
9
According to the guidelines issued by the German Federal Environmental Agency, exceeding 25 mg/m
3
of total VOC leads to headaches and further neurotoxic impact on health.
10
The BSEC software auto-calibrates the low and high concentrations applied during testing to IAQ of 25 and 250, respectively.