Sentry 2000 Scrubber System

for use with chlorine, sulfur dioxide, or phosgene

The Powell Sentry 2000 Scrubber System is one of the most advanced emergency scrubber systems available today and is for use with Chlorine, Sulfur Dioxide, or Phosgene.

The Powell Sentry Scrubber is a 4-stage, single-pass scrubber with a horizontal packed bed of high efficiency packing material. The Sentry 2000 can achieve virtually any stack emission performance desired. Thus, it is possible to control performance of the system based on any inlet and outlet concentrations and flow rates.

Sentry Scrubber

The Sentry 2000 has been subjected to the most demanding testing of any scrubber on the market. In rigorous testing, the Powell Sentry 2000 surpassed the requirements of Uniform Fire Code Section 80 and is the only scrubber tested in accordance with US EPA Reference Test Methods, which are more accurate than continuous gas detector tests.


  • Performance tested by the nation’s leading air emissions testing organization at full scale 3,000 ACFM air flow rate with 2,000 lb. releases of both chlorine and sulfur dioxide.
  • Performance tests witnessed by an independent firm specializing in the application of fluid dynamics to industrial flow problems. The Powell Sentry 2000 demonstrated better performance than the 5ppm stack discharge limit set by UFC specifications.
  • 1 Ton 4 Stage Single Pass Scrubber (customizable to multi-ton)

The following video includes actual footage of the chlorine release and tests performed in 1993 on the Sentry 2000 Scrubber System. For more information, download the Chlorine Stack Emissions documents: Part 1 and Part 2.