The GASL Continuous Emissions Monitoring System (CEMS) utilizes extractive dilution sampling technology. A sample is extracted from the stack at a low controlled flow rate, and mixed with a diluent gas (typically instrument air) at a relatively higher known flow rate. This reduces the sample dew point sufficiently to require only freeze protection on the sample transport line.

The diluted sample is conveyed to the analyzer rack at ground level where the gas concentration is determined using an ambient range continuous gas analyzer. The output of the analyzer is then scaled by the dilution ratio to represent the actual gas concentration. The success of this type of CEM System is attributed to the stability of the dilution system using a proprietary critical orifice and eductor in conjunction with the high accuracy of today’s ambient air range analyzers.

Most common monitoring modules include (but are not limited to): SO2, NOx, TRS, CO, CO2, O2, NH3. Each GASL CEMS is capable of monitoring more than 10 species from a single sample acquisition point.

Integrated Flow Monitor

GASL CEMS come complete with a flow monitoring module. This module consists of S-type Pitot tubes and a type K thermocouple combined with differential pressure and temperature transmitters. The system is configured to perform regular back purges on the Pitot tubes keeping them free and clear of any debris from within the sample stream.

Commitment to Quality

At GASL we're serious about our commitment to quality equipment and service; for more information on how we can assist you in please give us a call!