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Model 909 Hot/Wet Single Gas Mass Flow CEM

A number of governmental air pollution regulations restrict the allowable stack emissions from various industrial facilities. Often, a facility will need to measure and report the emissions of a single pollutant being emitted by their process. Under many compliance regulations, it is not adequate to simply know the concentration of pollutants in the stack gas emissions. Often, a facility is required to monitor and report the mass emissions (e.g. lb/hr, kgs/day, etc.) of their processes.
In order to accurately monitor mass emissions, an analyzer must be capable of accurately and reliably measuring the pollutant of interest while simultaneously measuring the stack gas velocity. This feat is made all the more difficult as the stack gas is typically hot, saturated with moisture, and dirty.


The AMETEK Western Research Model 909 is a single gas version of our Model 910 Continuous Emissions Monitor. The Model 909 is specifically configured for monitoring stack emissions on a mass rate basis. It measures stack effluent temperature and velocity in addition to pollutant concentration at stack conditions, enabling mass emission rates to be reported. With the addition of an optional zirconium oxide sensor, the Model 909 is capable of monitoring oxygen.

The Model 909 is a very robust and reliable analyzer. Its no-moving-parts, UV-based measurements do not suffer from H2O and CO2 interference. This greatly simplifies sample handling and sample integrity as there is no need for sample drying. As a fully extractive, heated wet basis analyzer, the 909's sample system components are simply heated above the dew point of the sample gas. This results in a simpler and more accurate calculation of gas concentrations, requiring no corrections for condensed and dissolved components.

The Model 909 performs all necessary sample gas and calibration gas flow management, and probe and sample line temperature control. The Model 909 is a full function Continuous Emissions Monitoring System (CEM) which requires the addition of only a sample probe and sample line to be fully operational. Housing options for the analyzer include a cabinet or walk in shelter built to your specifications.


  • High reliability and reduced maintenance requirements through a no-moving-parts-design
  • Hot/wet analysis prevents errors associated with:
    • Correcting for water vapor
    • Absorption losses in driers
    • Accuracy better than 2.5 ppm SO2
    • Able to measure SO2, NO, NO2, H2S, NH3 or a number of other chemicals
    • No H2O or CO2 interference
    • Automated zero and span gas calibration
    • Provides serial interface with plant DCS
    • Incorporates flow measurement for emission rate calculations.


  • Sulfur Plants
  • Smelters
  • Power Plants
  • Industrial Boilers and Process Heaters

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