TLG-837 Tail Gas/Air Demand Analyzer

Principle of Operation

To analyze the chemical composition of the tail gas, the TLG-837 uses an analysis method known as ultraviolet-visible (UV-Vis) spectroscopy. The system measures a high-resolution absorbance spectrum from 200nm to 800nm, where H2S, SO2, COS, and CS2 all have strong absorbance curves.

Spectrophotometer Principle of Operation

The TLG-837 uses a long-life xenon light source to transmit a signal through the sample fluid in the flow cell within the probe head. The signal is carried by fiber optic cables from the analyzer to the probe, where the sampled tail gas has unique interactions with the light based on its current composition. Learn more

TLG-837 Optical Assembly

Tail Gas Absorbance Spectra

To analyze tail gas, the TLG-837 detects the distinctive absorbance curve of each chemical analyte and mathematically isolates this structure from the total sample absorbance. In accordance with Beer-Lambert Law, the TLG-837 correlates the height of each curve directly to the real-time concentration of its corresponding chemical.

Absorbance Curve: Hydrogen Sulfide

Absorbance (AU)
Wavelength (nm)

Multi-Component Analysis

The TLG-837 simultaneously measures H2S and SO2 (and, optionally, COS and CS2) using a de-convolution algorithm which separates the absorbance curve of each analyte from the total sample absorbance by solving a regression matrix sourced from hundreds of data points. This approach is superior to the "chopper" filter wheel because it has no moving parts, no filters, and no cross-interference. Learn more

Tail Gas Multi-Component Analysis

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