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Altech Environmental

TRS - Total Reduced Sulfur Pollutants Measured with CEMS Systems

Altech Environment offers TRS CEMS or TRS discrete analyzers for the continuous measurement of total reduced sulfur. TRS commonly measured by catalytically converting Total Sulfur to SO2, which is then measured using pulsed florescence technology.

The pulsed florescence operating principle is based on measuring the emitted fluorescence of SO2 produced by the gas's absorption of UV radiation. Pulsating UV light is focused through a narrow band-pass filter mirror allowing only light wavelengths of 1,900 to 2,300 angstrom units (A) to pass into the fluorescent chamber. SO2 absorbs light in this region without any quenching by air or most other molecules found in polluted air. The SO2 molecules are excited by UV light and emit a characteristic decay radiation. A second filter allows only this decay radiation to contact a photomultiplier tube (PMT). Electronic signal processing transfers the light energy impinging on the PMT into a voltage which is directly analyzed. This pulsed fluorescence principle of operation was accepted by EPA under equivalency specifications defined in the February 18, 1975, Federal Register, Volume 40, No. 33 (ESQA-0486-060).

Contact Altech Environment for any questions you may have related to TRS CEMS, discrete TRS analyzers or pulsed florescence technology at 630.262.4400 or

Since we offer all common TRS measurement technologies and analyzer manufacturers (if you require a specific manufacturer or model), Altech Environment tailors its system offering to your specific application.

Altech’s instruments that measure TRS are as follows:

Air Quality Monitoring