Back To Top
Rosemount™ CT4400 Continuous Gas Analyzer
Emerson's Rosemount CT4400 is the world's first purpose-built hybrid Quantum Cascade Laser (QCL) and Tunable Diode Laser (TDL) process gas analyzer designed to enhance performance and reduce costs specifically in NOx measurement and continuous emissions monitoring applications.
Optimized for cold/dry applications running at ambient pressure, the CT4400 rack-mount analyzer allows easy integration into existing plant infrastructure without costly consumables or maintenance.

Get Continuous, Fast and Precise Process Gas Analytics Using Rosemount Hybrid QCL/TDL Laser Gas Analyzers

Play Video
Rosemount™ CT4400 Continuous Gas Analyzer


Ambient Temperature
41 to 122 °F (5 to 50 °C) ±1% per 5 °C
Sample Gas Temperature
59 to 122 °F (15 to 50 °C)
± 1%
R₂ > 0.99, ± 2%
Analog Output
Analog signal out: 4-20 mA (1 per measurement)
Digital signal out: Modbus® over TCP/IP
Health monitoring: NAMUR status report
Power Supply
100 - 240 Vac, 50 / 60 Hz
Half-rack: 33.1 lb. (15 kg)
Full-rack: 66.1 lb. (30 kg)
Half-rack 8.5 × 24.5 × 6.8 in. (215 × 623 × 172mm)
Full-rack 19 × 25.9 × 6.8 in. (482.6 × 658 × 172 mm)
Inlet gas port connector: 6 mm Swagelok® type
Outlet gas port connector: 6 mm Swagelok® type


  • Measures up to seven application-specific gas components simultaneously with enhanced dynamic range from sub ppm to percent levels
  • Ideal for environmental monitoring applications measuring standard components, such as NO, NO2, SO2, CO, CO2, and O2
  • Compatible with existing plant infrastructure to minimize disruption or cost when replacing legacy analyzers
  • Rosemount™ QCL/TDL technology with patented laser chirp technique enables detection of individual gas species, free from cross-interference effects of other gas in the stream
  • Sub-second measurements with high-sensitivity and high-accuracy monitoring ensure compliance with regulatory requirements
  • No complex sample treatment or consumables reduce costs and improve plant efficiency
  • Rugged, interchangeable modular configuration holds up to four laser modules and delivers outstanding reliability and measurement stability
  • Inherently stable spectroscopic technique reduces calibration needs and delivers reliable performance