Bosch CISS - Page 9

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4.11.4 Environmental sensors - temperature, pressure, relative humidity – BME280
For the environmental measurands - temperature, relative humidity and air pressure - a BME280 is used. With the influence
of the housing and self-heating of the electronic components, the behavior given in the table below has been characterized
for the CISS. The given accuracy is specified with the following measurement setup:
 One environmental measurement per minute
 No accelerometer, magnetometer, gyroscope active
 Power supply via the CISS USB cable
TEMPERATURE
Range -20 – 80 °C
Resolution 0.1 °C
Precision ± 0.1 °C
Response time (τ
63 %
) from 20 °C to 50 °C
at 40 % r.H. and 980 hPa (with medium
access)
7.5 minutes
Accuracy max. ± 2 °C +3% T °C
Sampling rate BLE / UBS: ≤ 1 Hz
PRESSURE
Range 300 – 1100 hPa
Resolution 0.01 hPa
Precision (1-sigma level) ± 0.01 hPa
Response time < 1 s
Accuracy at 25 °C and 40 % r.H. ± 1.5 hPa
Sampling rate BLE / UBS: ≤ 1 Hz
HUMIDITY
Range 0 – 90 % r.H.
Resolution 0.01 % r.H.
Precision (1-sigma level) ± 0.5 % r.H.
Response time (τ
63 %
) from 80 % r.H. to 40
% r.H. at 25 °C and 980 hPa
20 minutes
Accuracy at 20 – 80 % r.H. max. ± 7% at +20 °C
max. ±10% at -20 °C
Sampling rate BLE / UBS: ≤ 1 Hz