FID Total VOC
Protea’s Flame Ionisation Detector (FID) analysers are used to give quick, accurate measurement of Total VOC concentration in a range of applications such as emissions and process control.
Within the FID analyser chamber is a Hydrogen (H2) flame burning in an electrical field. The flame is fed by high purity fuel gas (atmosFID can use H2 gas or a H2/He mix) and a hydrocarbon (HC)-free combustion air. The sample gas to be analyzed is then also fed into this flame.
The hydrocarbons within the sample gas are "cracked" in the flame and the resulting HC fragments are then ionized. An ion current in the order of 10-14A is generated in the electric field; this electric current is related to a DC amplifier and gives the detection of the HC content.
The measuring method requires that the measuring signal is proportional to the number of non-oxidized carbon atoms in the sample gas. Carbon atoms that are pre-oxidized are only partially measured. This phenomenon is expressed by the response factor (RF) of various hydrocarbons. Protea can provide a complete response factor list for the atmosFID.
The atmosFID Total VOC Analyser is designed for Continuous Emissions Monitoring (CEM) of gaseous VOC emissions from a wide range of sources.