User Manual

20
4. SPECIFICATIONS
4.1 REFERENCE CONDITIONS
Influence quantities Reference conditions
Supply voltage 3 ± 0.5V
Air pollution no pollution (CO, solvents, etc.)
4.2 MEASUREMENT CHARACTERISTICS
4.2.1 CO
2
measurements
Type of sensor Dual-beam infrared cell
Measuring principle Non-dispersive infrared (NDIR) technology
Measurement range 0 to 5.000ppm
Intrinsic uncertainty ±3% ±50 ppm at 25°C and 1013 mbar; in ECO mode, ±3% ±80 ppm at 25°C and 1013 mbar
Response time at 63% 195 seconds
Resolution (R) 1ppm
4.2.2 Influences on the measurements of CO
2
.
The influence of the temperature is 1 ppm/°C from -10 to +45°C.
The influence of the atmospheric pressure is:
CO
2 real
= CO
2 measured
x(1 + (1013-P)x0,0017) avec P= pressure in mbar.
4.2.3 Temperature measurements
Type of sensor CMOS
Measurement range -10 to +60°C
Intrinsic uncertainty
±0.5°C at 50% RH
Influence of relative humidity
±0.5°C ±R from 10 to 40% RH
Outside of the range stated above, ±0,032 x (T-25°C) ± R
Resolution (R) 0.1°C or 0.1°F
4.2.4 Humidity measurement
Type of sensor Capacitive
Measurement range 5 to 95 %RH
Intrinsic uncertainty ± 2 %RH ± R from 10 to 90 % RH
± 3 %RH ± R outside of the range stated above.
Resolution (R) 0.1 %RH
Measurement hysteresis
± 1 %RH
Note: Prolonged exposure to values outside the 10% to 80% range may lead to a
measurement bias of as much as ± 3 %RH. This bias disappears after 5 days at between 20
and 30°C and 40 and 75% RH.
Rate of increase of intrinsic
uncertainty
< 0.5 %RH/year.