Toms River, NJ (June 9, 2006) – Gas samples with a relative humidity of over 85 percent can damage electrochemical sensors (ECS) used to monitor hydrogen sulfide (H2S) at wastewater treatment plants.  Condensed water on the cell can flood the sensor, greatly reducing the cell lifetime.  Condensation in the sample line can also affect the concentration of highly water soluble H2S.  These problems can be eliminated with the Micro-GASS™ Gas Analysis Sampling System from Perma Pure.  The system reduces the water content of gases from humid environments to optimal humidity for ECS cells, without altering the concentrations of analyte gases in the sample, producing reliable, accurate results

The Micro-GASS system removes water directly from the vapor phase using patented Nafion® membrane gas dryers.  The membrane selectively removes water vapour only, leaving the H2S concentration intact.  Drying is a continuous, self-regenerating process with maintenance limited to periodic filter replacement.

The self-contained system requires no additional sample pumps or filters.  A built-in pump draws the sample to the ECS cell and continuously removes water vapor from the dryer.  The compact, environmentally sealed enclosure resists corrosion and requires only electricity to operate.

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