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Press Release Ref: PC626
The new Procal 5000 full spectrum in-situ fully verifiable stack gas analyser resolves the problems associated with this application. The instrument mounts directly on the stack with the enveloped in-situ sample cell mounted in the flue gas. During normal operation, flue gas passes through the sample cell where the measurement takes place. By introducing either compressed instrument air for zero or test gas for verification, the instrument can be zeroed and calibrated. Typically the automatic zero takes place on a 24-hour basis where as the verification need only be carried out on a three monthly basis.
The new Procal 5000 full spectrum in-situ fully verifiable stack gas analyser resolves the problems associated with this application. The instrument mounts directly on the stack with the enveloped in-situ sample cell mounted in the flue gas. During normal operation, flue gas passes through the sample cell where the measurement takes place. By introducing either compressed instrument air for zero or test gas for verification, the instrument can be zeroed and calibrated. Typically the automatic zero takes place on a 24-hour basis where as the verification need only be carried out on a three monthly basis. The instrument can monitor several components simultaneously. In a recent order the chosen ranges were:
Range 1 0 to 50ppm NH3
Range 2 0 to 50ppm NO
Range 3 0 to 50ppm NO2
In addition, the customer opted to measure SO2 at a range of 0 to 200ppm.
The stack mounted analyser is connected via an RS 485 digital Modbus protocol link to a conventional desk top PC running ACU for Windows where the data is displayed and data logged.
The accuracy and reliability of the measurement is achieved by analysing the absorption of UV across a full spectrum, this enables the removal of cross sensitivity between the components and a greater prime sensitivity of each measurement. The accuracy of the instrument is within 2% of FSD and the auto zero ensures that the drift is less than 2% FSD in 24Hr (non-cumulative).
February 1999
