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RGD - SRI Instruments
RGD - Reduction Gas Detector
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Detects reducing gases, such as CO to 50 ppb level, and H2 to 0.5
ppm
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Heated UV detection cell with absorbance output
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User packable reaction tubes (requires mercuric oxide, not included)
The SRI reduction gas detector is sensitive to volatile reducing compounds down to the ppb level,
and is often used to detect atmospheric carbon monoxide and hydrogen.
When compared to the
, the RGD is ten times more sensitive to unsaturated
hydrocarbons, and virtually unresponsive to saturated hydrocarbons. This combination of sensitivity
and selectivity allows the analysis of atmospheric pollutants such as ethylene, benzene, carbonyl
sulfide, phosphine, and methanol.
Our RGD uses a mercuric oxide reaction tube and a mercury lamp in a heated UV detector cell. When a reducing gas
elutes from the column into the hot reaction tube, it reacts with the mercuric oxide to form mercury vapor. As it flows
through the detector cell, the gaseous mercury absorbs the UV light from the mercury lamp inside the cell. The change
in transmittance is converted by the data system into an absorbance output, which is proportional to the amount of
reducing gas. A carbon filter at the UV detector cell outlet traps the condensed mercury vapor for safe disposal.
High concentrations of chlorinated and aromatic compounds can easily contaminate the mercuric oxide bed, resulting in
the need for replacement. Reaction tubes are easily replaceable, and blank reaction tubes can be economically packed
by the user.
This four minute chromatogram
shows the RGD response to 0.1 mL of
100 ppm hydrogen.