General Characteristics

Model 2001 VOC/THC/CH4 has been designed, developed and manufactured following CEE CEN264 # 326 and UNI EN 12619 and UNI EN 13526 regulations for the detection of VOC/THC/CH4 in emissions. The sample is extracted through a variable length probe which has a ceramic filter in its tip and a heated line PTFE (150-180ºC) and also includes a thermostat-controlled pump. A second filter, made of stainless steel is placed before the sample capillary. Although the sample is fed continuously to the FID detector, the response is fast and continuouly active with no delay cycle due to commutations of the sample valve.

The Methane fraction is eventually determined with the simple insertion of a catalytic converter (through a bypass valve) which converts all organic compounds except CH4 into CO2 with no response from the Flame Ionization Detector.

A hydrogen fuelled microflame is used as detector for organic compounds, since the oxidation reaction of Carbon compounds (Cx=CO) which takes place at its heart generates a consistent quantity of ions which is proportional to the concentration of organic Carbon present in the sample.

Firstly, the structure of the detector mixes hydrogen and sample gases, then the mixture burns in an oxygenated atmosphere (pure air with a stequiometric excess). The electric charges generated by the combustion of the organic matter in the sample are collected by a pair of polarized electrodes and converted into electrical microcurrents. These ionization currents generate tension variations in the electrometer and are transferred to a high resolution TFT-LCD screen.

The instrument incorporates internal memory with high storage capacity. The data shown in the screen can also be stored and/or treated in the following ways: - Registered in graphical form. - Printed. - Sent to a PC.