User Manual EE895
Miniature Sensor Module for CO
2
, Temperature and Barometric Pressure | 21
Fig. 13 Step response vs. filter coefficient
5 Technical Data
Measurands
CO
2
Measurement principle
Dual wavelength non-dispersive infrared technology (NDIR)
Measuring range
0...2 000 / 5 000 / 10 000 ppm
Accuracy
1)
@ 25 °C (77 °F) and 1 013 mbar (14.7 psi)
0...2 000 ppm
0...5 000 ppm
0...10 000 ppm
< ±(50 ppm +2 % of measured value)
< ±(50 ppm +3 % of measured value)
< ±(100 ppm + 5 % of the measured value)
T and p compensation of the CO
2
reading
With on-board sensors
Temperature dependency
, typ.
±(1 + CO
2
concentration [ppm] / 1 000) ppm/°C (-20...45 °C) (-4...113 °F)
Residual pressure dependency
2)
, typ.
±0.014 % of the measured value / mbar (ref. to 1 013 mbar)
Initialisation time (power on)
< 1 s
Response time t
63
140 s with measured data averaging (smooth output)
75 s without measured data averaging
Sampling intervall
User configurable from 10 s up to 1 h; factory setup = 15 s
Calibration interval
3)
5 years
1) With data averaging for smooth output signal. Operation without measured data averaging or in short-time mode might lead to additional
measurement uncertainty.
2) The pressure dependency of a device without pressure compensation: 0.14 % of measured value / mbar.
3) Recommended under normal operating conditions in building automation.
Pressure (p)
Working range
700…1 100 mbar (10.15...15.95 psi)
Accuracy
, typ.
@ 25 °C (77 °F)
±2 mbar (20…80 %RH)
Temperature dependency
, typ.
±0.015 mbar/K
