TDL Spectrometers | TDL Measurement Parameters | METTLER TOLEDO GPro 500

TDL Spectrometer Parameters

Tunable diode laser spectrometers for in situ gas monitoring

Tunable diode laser spectrometers are designed to measure concentrations of a range of common gases in industrial production environments. The METTLER TOLEDO series of GPro 500 TDL spectrometers can monitor oxygen, carbon monoxide, carbon dioxide, moisture, hydrogen sulfide, hydrogen chloride, ammonia and methane. Each GPro 500 TDL spectrometer can integrate with process adaptions that enable measurement directly in the gas stream in a wide range of process environments.

Filter:Clear All


888 687 7687
Call Service


What is a Tunable Diode Laser spectrometer?

Tunable diode laser spectrometers, or TDL spectrometers for short, are gas analyzers that are used for measuring the concentration of specific species within a gas mixture, using laser absorption spectrometry. In a TDL spectrometer, a laser beam, tuned to identify a particular gas species, passes through the gas to a detector. The presence of this gas in the stream causes light absorption and reduced signal intensity. The light that arrives at the detector of the TDL spectrometer is captured by a photodiode and analyzed to quantify the gas concentration.

What gas species can be measured with a TDL spectrometer?

METTLER TOLEDO GPro 500 TDL analyzers offer measurement of carbon monoxide (CO%), carbon dioxide (CO2%), hydrogen chloride (HCl), hydrogen sulfide (H2S), gaseous oxygen (O2), methane, ammonia and moisture. These can be paired with a wide range of process adaptions to provide the tunable diode laser analyzer to meet your requirements. For example, an oxygen gas analyzer can be paired with a filter probe to allow you to install an oxygen TDL analyzer in a gas stream that has a heavy particulate content. That same oxygen gas analyzer can be paired with a wafer adaption to create an in-line TDL gas analyzer for oxygen in a small line size (down to DN50).

Thank you for visiting We have tried to optimize your experience while on the site, but we noticed that you are using an older version of a web browser. We would like to let you know that some features on the site may not be available or may not work as nicely as they would on a newer browser version. If you would like to take full advantage of the site, please update your web browser to help improve your experience while browsing