November 2016Analytical Instrumentation & Environmental Monitoring
Tuneable diode laser (TDL) spectroscopy is rapidly becoming the gas analysis technology of choice in industrial processes. But sometimes users find that conditions at the measurement location can limit their use. Mettler Toledo has been rethinking gas analytics and has developed the GPro 500 TDL series, a versatile platform that allows one to place a TDL wherever it matters in the process, whatever the location.
The GPro 500 TDL system is ideal for tough and challenging gas measurement applications and is designed for in-situ petrochemical processes and safety applications. Packed with state-of-the-art technology, it offers exceptional measuring performance, easy installation and requires almost no maintenance. TDL gas analysers are a significant improvement over extractive analysis systems, as no sample extraction or conditioning is necessary, they are immune to interference from background gases, and very tolerant to high moisture and dust environments, and they exhibit very low drift.
Operating principles
TDL analysers measure the concentration of a target gas by analysing the absorption of laser light. The GPro 500, has an original design that is adaptable to almost any kind of process. The series comprises four separate products for the measurement of oxygen, carbon monoxide, carbon dioxide and moisture. The product has a very low detection limit and a response time of less than two seconds.
Most TDLs are comprised of two separate parts: a laser source and analyser. Aligning the two elements across a pipe is often highly problematic and may need repeating more than once. The GPro 500 combines the laser source and analyser in a single unit. The laser beam from the source passes down the probe and is reflected by a three-sided mirror back to the analyser, so no alignment is required.
The GPro 500 TDL series is available with a range of adaptions that fit directly to the analyser’s head, which provides flexibility in application. Most TDLs use a large quantity of purge gas to prevent the analyser’s optics from being coated by dust in the gas stream. The GPro 500 is available with a robust probe fitted with a shielded particle filter that eliminates the need for purge gas. The series also has a wafer cell, which enables accurate measurement in confined spaces such as narrow pipes.
Intelligent sensor management
Mettler Toledo’s Intelligent Sensor Management (ISM) technology adds to the features of the GPro 500 by incorporating predictive diagnostics that continually assess the optical path quality and indicate when cleaning is required, before measurements are affected. Other than yearly verification and occasional cleaning of the optics, no other maintenance is required. The GPro 500 can be left to provide real-time, continuous, accurate gas measurements, resulting in operational safety at all times.
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