0 to 4% CO2 transmitter for special applications


range 0 to 4% CO2
designed for harsh environments
alarm relays

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Carbon dioxide measurement for special applications.

The CF8 carbon dioxide (CO2) transmitter can be used to monitor applications such ventilation control for underground storage, food transport, tunnels, mining, etc. where CO2 levels can rise to dangerous levels. The CF8-W-Disp-GH is designed for use in greenhouses, and is equipped with an extra dust and water filter to provide long term maintenance free-use in adverse conditions.

Instances where CO2 can rise to a quite high level e.g. beer cellars and areas around CO2 cylinders (including soft drinks machines) are key areas that should be monitored for CO2 leaks.

The wall mounting IP54 housing of the CF8-W is designed for wall mounting in environmentally harsh areas that require CO2 monitoring, and provides a current or voltage and relay outputs with an optional display.

With a range of 0 to 4% (40,000 ppmv), the CF8-W alerts operators to high CO2 levels. The use of a non-dispersive infra-red sensor (NDIR) offers high precision and low maintenance with a sensor life expected to be in excess of 15 years. The automatic baseline correction means that no further calibration is required if the systems are installed in indoor applications.


 CO2 Level


 350 to 450 ppmv

Normal atmospheric air (outside)

 400 to 1,200 ppmv

Normal room air (ventilated)

 > 1,000 ppmv

Fatigue and loss of concentration

 5,000 ppmv (0.5%)

Maximum permissible level at the workplace during an 8 hour workday

38,000 ppmv (3.8%)

Exhaled air (direct exhalation)

>100,000 ppmv (10%)

Nausea, vomiting, loss of consciousness and death




CO2 and temperature

Measurement principle

Infrared (NDIR) with automatic calibration

CO2 range

0 to 4% (40,000 ppmv)


± 200 ppmv

Temperature range

0 to 50 °C / 30 to 150 °F (temp output on CF8-W-GH only)





Temperature measurement range


0 to 50°C (30 to 120°F)

Output 1 (0 to 4%vol  CO2)

0/2 to 10 VDC or 0/4 to 20 mA

Output 2 (0 to 4%vol  CO2)

0/2 to 10VDC or 0/4 to 20 mA


Output 3 (CO2)

Relay 1: open <1.4%, closed >1.5%

Relay 1: open<1.9%, closed >2.0%

Output 4 (CO2)

Relay 2: open <2.9%, closed >3.0%




Expected lifetime

>15 years*






142 x 84 x 46mm

Enclosure protection




16 to 29 VDC/AC

* Application dependent

All specifications subject to change