COF is a detector intended for demand-controlled ventilation in parking garages and road tunnels etc. The detector is installed for both safety and energy-saving reasons. It measures the carbon monoxide concentration using an electrochemical method of measurement characterised by high selectivity even in low concentrations. The output signals are linear representations of the gas concentration.

Limit values
The limit values for carbon monoxide may vary from one country to another. Please check local standards and regulations. The following limit values have been set up by the Swedish Work Environment Authority (according to AFS 2005:17, Occupational exposure limit values):

• Level limit value (LLV) 35 ppm
• Short-term value (STV) 100 ppm

However, when the gas comes from exhaust fumes, the level limit value is 20 ppm.