H2S analyser with sample conditioning system
January 2001
Analytical Instrumentation & Environmental Monitoring
Ametek Western Research (represented locally by OEN Enterprises) has introduced a low maintenance, reliable and rugged H2S analyser. The Model 933 uses Ametek Western Research's frontal elution chromatography sampling technique combined with their high-resolution multiwavelength UV optical bench. This results in a low level H2S analyser that is designed to operate unattended for six months or more.
The analyser offers self-recovery after high concentration H2S events and a fast response time for increasing or decreasing H2S concentrations. No consumables, reagents or disposables are necessary other than zero gas.
Accurate analysis of the gas is performed via direct UV absorption spectroscopy. In sales gas applications, H2S and COS are the first absorbing species to elute through the chromatography column. These compounds are analysed photometrically. The next species to elute is methyl mercaptan, which is also measured, and finally, the interfering ethyl mercaptan. Two columns are employed in the Model 933. While one column is conditioning the gas sample, the other is automatically regenerated.
Two on-board microprocessors perform concentration calculations, data processing, calibration, sophisticated self-diagnostics and column switching control. Typical applications for the analyser include gas sweetening, pipeline quality/custody transfer, synthetic natural gas and in blending stations.
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