Whenever it is necessary to measure NO2 in the sample (usually measured in the CEMS systems) it is necessary to use a catalytic converter that transforms NO2 into NO.
This procedure can be done through a simple manual operation without the need of using solenoid valves.
There is a version of the Converter with the possibility of heating the sample so that the converter can be installed upstream the gas cooler/dryer without NO2 loss.
The catalytic converter usually integrate the sample conditioning system and is usually provided in a Continuous Emissions Monitoring System (CEMS) but also in a process analysis integrated solution.