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Altech Environmental

VOC - Volatile Organic Compounds Monitored with CEMS Systems


Altech provides accurate and fast measurements of VOC (Volatile Organic Compounds). We offer complete VOC CEMS or discrete analyzers for the measurement of VOC. We use one of two technologies to measure VOC:

FID (flame ionization detection) is used in Altech THC/VOC CEMS and ambient air systems to measure VOC. 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 VOC in the sample gas.

In Altech’s flagship MIR 9000, MIR 9000CLD, 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 VOC CEMS, discrete VOC analyzers, FID’s (Flame Ionization Detectors) or NDIR technologies at 630.262.4400 or sales@altechusa.com

Since we offer all common VOC 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: