SITRANS TDL is an in-situ tunable diode laser analyzer, designed for fast, selective and sensitive measurement of numerous different gases, including O2, NH3, H2O, CO, CO2, CH4, HCl, HF, H2, H2S, CH2O and many more.
It consists of a pair of cross-duct sensor units which are directly installed at the measuring point in the plant, making it the ideal solution for non-contact measurement of gas concentrations.
In-situ tunable diode laser (TDL) measurement with no sample conditioning — reducing maintenance, eliminating consumables and improving uptime in harsh process conditions.
Rapid, continuous measurements support tighter control loops, quicker detection of process deviations and improved product quality and safety.
High selectivity and stable performance across challenging temperatures, dust and moisture — delivering reliable results for emissions monitoring and critical process applications.
System layout | Cross-duct sensors; all electronics included in sensor heads |
Measurement gases | O2, NH3, H2O, CO, CO2, CH4, HCl, HF, H2, H2S, CH2O and many more gases |
Optical path length | 0–30 m; longer path lengths possible depending on process conditions |
Process interfaces | DN50/PN16, DN65/PN6, ANSI 2”/150lbs |
Communication interfaces | Modbus RTU, Modbus TCP, Profibus DP, web interface, SIMATIC PDM, local human machine interface |
Hazardous areas certifications | ATEX (Zones 1/21), IECEx (Zones 2/22), and QPS (Class I, Div 2) |
The SITRANS TDL contains all the needed hardware to perform laser gas analysis: a pair of cross-duct sensors, an emitter unit and a receiver unit. The sensors are mounted directly on the process. The transmitter sends a laser beam at a specific wavelength, it passes through the process gas and reaches the detector on the receiver side. The measurements are carried out online with an excellent response time.
Laser diode technology is well-established in industrial applications, for example:
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