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Chemical Engineering

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Focus on Analyzers

| By Gerald Ondrey

TDL analyzers for chlor-alkali and combustion processes

This company recently enhanced its GPro 500 tunable-diode laser (TDL) gas analyzer series (photo) for better management of corrosion in the chlor-alkali industry and for greater combustion control, as well as increased O2 -measurement accuracy. The GPro 500 TDL H2O ppm sensor is designed for the measurement of very low moisture levels for corrosion prevention in chlor-alkali plants. The response time of the GPro 500 TDL moisture sensor is below 4 s, which is up to 50 times faster than commonly used phosphorus pentoxide sensors. In situ installation with the GPro 500 can avoid risks of toxic gas leaks and the frequent maintenance typical of extractive systems used with P2O5 sensors. The new dual-gas CO ppm/CH4 % GPro 500 analyzer is designed for combustion applications, which allows measurement of CO in the presence of CH4. Moreover, in large furnaces with multiple burners, CH4 measurement provides additional security by detecting a possible malfunctioning burner that has not ignited or ignited only partially. The GPro 500’s new MR3 Cell enables O2 measurement in small pipes. With patented technology, the MR Cell multiplies the path length by a factor of 2 to 3, therefore lowering the detection limit achievable in small spaces. — Mettler Toledo Process Analytics, Urdorf, Switzerland