Tunable diode lasers (TDLs) offer low-maintenance gas analysis in chemical and petrochemical processes, says Mettler Toledo.
TDLs use a laser, tuned to absorption lines of the gas to be measured, that passes through the matrix to a receiver. Analysis of the laser light reveals the level of the target gas.
Unlike cross-stack TDL designs, the GPro 500 series uses a probe that protrudes into the gas stream. A corner cube at the end of the probe directs the source laser beam back to the receiver in the analyser’s head.
This design simplifies installation and negates the need for beam alignment that can be an issue with cross-stack TDLs, says the company.
The full GPro 500 portfolio is suitable for a number of chemical and refinery processes where paramagnetic and extractive NDIR analysers are normally used.
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