SITRANS TDL - Tunable Diode Laser Gas Analyzer | Siemens

Why SITRANS TDL?

SITRANS TDL is an in situ tunable diode laser analyzer that measures critical gases directly in the process stream. It is fast, selective and virtually maintenance free. By eliminating sampling systems, it reduces lifecycle costs and ensures reliable performance even in harsh environments. Its web-based setup and Ethernet connectivity simplify integration and service.

Range of applications (examples):
Chemical industry: process control (O₂, CO, CH₄, HCl, H₂O, NH₃, HF)
Power industry: boiler optimization, coal silo monitoring, DeNOx SCR/SNCR processes
Hydrogen industry: electrolyzer stack monitoring (H₂, O₂)
Steel industry: blast furnace control, hot rolling, coke oven, pickling process
Cement, wood and paper: bag house and electrofilter monitoring, furnace optimization
Semiconductor industry: exhaust gas monitoring

…and many more across diverse industrial sectors.

Key benefits

Reduce operating costs

Eliminate sampling systems and lower maintenance through contactless, in situ measurement and robust hardware, improving total cost of ownership.

Improve process control

Get fast, selective, real‑time readings that stabilize combustion and process performance across chemical, power and industrial settings.

Simplify integration and service

Configure via built‑in webserver and Ethernet, enable predictive maintenance and connect to common plant protocols for seamless deployment.

Featured capabilities

Measure directly in process

In situ cross‑duct design puts the laser across the gas stream so you read true concentrations without sample conditioning or lag.

Handle harsh conditions

IP66 enclosures and high‑temperature operation (O₂ up to ~1100 °C) support reliable performance in furnaces, kilns and incinerators.

Connect with standard protocols

Use integrated Ethernet and common industrial interfaces with a browser‑based UI for configuration, monitoring and diagnostics.