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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 specification3

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Accuracy status4

AXIAQ

Android compatible

IAQ Resolution

IAQrs

IAQ Range

IAQrg

500

Sensor-to-sensor

deviation5

IAQS2S

All operation modes

±15%

±15

Durability to

siloxanes6,7,8

IAQS2S

Sensor-to-sensor deviation

±15%

±15

IAQdrift

Drift at low & high

concentrations

±1%

±4

Table 4: Indoor air quality (IAQ) classification and color-coding9

IAQ Index

Air Quality

0 – 50

good10

51 – 100

average

101 – 150

little bad

151 – 200

bad

201 – 300

worse2

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/m3 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/m3 of octamethylcyclotetrasiloxane (D4).

9 According to the guidelines issued by the German Federal Environmental Agency, exceeding 25 mg/m3 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.

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