SIEMENS has released a diode laser gas analyser for optimising processes within the steel industry.
The SITRANS SL has an in-line reference cell filled with a non-interfering reference gas. This is said to allow for a fast and non-contact measurement of gas concentrations in process or flue gases.
Gas detection and measurement is often needed in the metal industry, be it for emissions from furnaces or for gas-shielded welding. Given the harsh conditions often found in the plant, non-contact gas measurement is sometimes the only choice for such analysis.
The analyser works because different gases absorb light differently. The light from a laser diode is sent from the transmitter through the process gas to the detector on the receiver side.
According to the company, only the gas component of interest will interact with the laser. Compensation techniques allow the unit to eliminate other process influences such as dust and temperature.
The entire instrument is consisted of two enclosures for the transmitter and receiver. These are connected with one cable, while another cable is connected to the receiver providing power and control.

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