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temperature/humidity, CO2 datalogger, PoE



The amount of carbon dioxide had been virtually constant at 280 ppm (particles per million) – i.e 280 gas molecules per million air molecules – the last ten thousand years. However in recent years, this measured value has been increasing rapidly at approx. 2 % per year.
A high level of CO 2 in the air within a room causes headaches, tiredness and lack of concentration. The regulation on CO 2 concentration was established in order to evaluate IAQ (Indoor Air Quality). Normal atmospheric air in so-called ‘clean air areas’ has a level of 360 ppm and approx. 500 ppm in urban areas. The limit of 1,000 ppm (“Pettenkofer Figure”) is still seen as being adequate indoor-air quality, which is especially important when regarding all meetings and conference rooms, as well as schools and open-plan offi ces. As a guideline for school rooms in the USA the limit of 1,000 ppm applies; for workplaces the occupational exposure limit is 5,000 ppm.

Technical data
Dimensions 166x78x32mm
Measuring interval 10/30s, 1/10/12/15/30min, 1/3/6/12/24h
Construction Plastic housing
Operating time with battery > 4 month
Data storage 16 MB, 3,200,000 measured values
LC-Display Height 90x64mm
Weight approx. 250g
Included in delivery PC-Windows Software SmartGraph 3
for graphical and numerical representation
of measured values / instruction manual / data cable / battery / DIN rail bracket
Interface USB, LAN
Storage interval 1/10/12/15/30min, 1/3/6/12/24h
Power supply 4 x LR6 AA Mignon, USB
Operating temperature -20...50°C
Operating rel. humidity
Max. height 10,000m above sea level

Principle NTC
Measuring range -20 ... 50 °C
Unit °C
Accuracy ±0.3°C (0...40°C), otherwise ± 0.5°C
Resolution 0.1

Relative humidity
Principle Capacitive
Measuring range 0 ... 100 % RH
Unit % RH
Accuracy ±2% RH
Resolution 0.5

Principle NDIR
Measuring range 0 ... 5000 ppm
Unit ppm
Accuracy ± 50 ppm +3 measured values
(at 20 ° C and 1,013 mbar)
Resolution 1 ppm
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