User Manual

Page 18 Unrestricted 0 – Siemens Smart infrastructure
8.4 Sensors
CO2 sensors measure the concentration of CO2 in parts per million (ppm). Fresh outdoor air
is around 400 ppm and indoor levels up to 1000 ppm are acceptable.
There is no generally acceptable level of VOC as there is usually a mixture of volatile gases
some of which are more dangerous than others. Siemens VOC sensors are sensitive to a broad
range of oxidizing and reducing gases, giving an indicative measure.
Siemens offers combined CO
2/VOC sensors (AQR.., QPA.. and QPM.. sensor ranges) which
control ventilation considering both CO
2 and VOC. For details, refer to the respective
Data Sheets.
For information on the measurement of PM2.5, see Reference 27.
Summary of recommended room sensors
The following table is just a selection. See the Symaro brochure for details (Reference 19).
AQR2548NF
and
AQR2530NNW
AQR2570.and AQR2533NNW
AQR2570.and AQR2535NNW
AQR2570.and AQR253NNWQ
AQR2576.and AQR2530NNW
AQR2576.
and
AQR2530NNW
AQR2576.and AQR2532NNW
AQR2576.and AQR2535NNW
AQR257
6.and
AQR253NNWQ
QMX3.P70
QPA2002..
QSA2700..
Features
LED indicator
for IAQ
x x x
Temperature sensor x x x x x x
Humidity sensor x x x x x x x
CO2 sensor x
1
x x x x x x x
VOC sensor x
1
x
PM2.5 x
Mounting
2
Flush-mount x x x x x x x x x
Directly on wall x x x
1 Combined CO2 and VOC control
2 See also the Siemens duct sensors QPM.. (Reference 19)