SEMTECH® FID: THC Analyzer
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Emissions Measurement Solutions Innovation. Built on Experience. The SEMTECH® Flame Ionization Detector (FID) measures Total HydroCarbons (THC) using a vacuum flame ionization detection unit. The system is designed to minimize the loss of hydrocarbons prior to analysis by maintaining the required temperature through the use of a heated filter, heated sample line and stainless steel fittings, which all have low gas adsorption characteristics. Principle of Operation: The SEMTECH® FID uses a Flame Ionization Detector for the measurement of Total HydroCarbons. The FID chamber must first be heated to 191°C. Warm up time is approximately half an hour. Once the FID reaches temperature, the flame automatically ignites. The valve is then opened to allow FID fuel and air into the chamber, and the flame ignites automatically. The exhaust sample can then be injected in the sample port. The FID fuel, air, and exhaust sample are mixed together at the bottom of the detector’s flame jet, and are burned on the flame’s tip. As the hydrocarbons burn, they form positively charged ions. These ions are repelled by the jet’s nozzle head, which has a positive bias voltage. The positive ions are then attracted to the negatively charged collector plate, creating a current which is then measured. User-selectable measurement ranges ensure accuracy for a wide variety of test applications.

Automatic Flame Ignition: the FID flame will light automatically after approximately 30 minutes of warm-up time. Measuring Range: the SEMTECH® FID has 4 user-selectable measurement ranges between 0-100 and 0-30000 ppmC1. Sample Handling: water trap and Nafion dryer are integrated into the SCS module. A heated sample line (various lengths) delivers the sample to the FID chamber at 191°C. Particulate matter is removed using a built-in disposable filtering system. Combustion Air: the system includes a catalytic converter, enabling the use of room air as combustion air for the FID flame....