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Altech Environmental

THC - Total Hydrocarbons Pollutants Measured with CEMS Systems

Altech provides accurate and fast measurements of THC (totally hydrocarbons). We offer complete THC CEMS or discrete analyzers for the measurement of THC. We use one of two technologies to measure THC:

FID (flame ionization detection) is used in Altech THC/VOC CEMS and ambient air systems to measure THC. FID is well-established and is used for high sensitivity, wide linear range and efficient detection of organic compounds. The sample gas is introduced into a hydrogen/helium fueled flame inside the FID. Any hydrocarbons in the sample will produce ions when they are combusted. Ions are detected using a metal collector which is biased with a high DC voltage. The current across this collector is thus proportional to the rate of ionization which in turn corresponds to the concentration of THC in the sample gas.

In Altech’s flagship MIR 9000, MIR 9000 CLD, MIR-IS and MIR 9000H analyzers, non-dispersive infrared technology (NDIR) using the Gas Filter Correlation (GFC) technique is used to measure THC. The infrared bench consists of a light source, chopper, multipass sample cell, filter wheels, and solid-state detector. The filter wheel containing the optical filter and gas cells provides a dual function. One is to modulate the light; the second is to isolate the wavelengths for measurement. This configuration provides for a much simpler optical and mechanical system. The modulated light is sent into a temperature stabilized (50ºC) multipass sample cell. The MIR 9000 is available in cold/dry and hot/wet configurations.

Contact Altech for any questions you may have related to THC CEMS, discrete THC analyzers, FID’s (flame ionization detectors) or NDIR technologies at 630.262.4400 or

Since we offer all common THC measurement technologies and analyzer manufactures (if you require a specific manufacturer or model), Altech tailors its system offering to your specific application – Altech’s instruments that measure THC are as follows:

Complete Systems:

Discrete Analyzers: