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Rosemount™ CT5800 Continuous Gas Analyzer
rosemount ct5800
Emerson's Rosemount CT5800 continuous gas analyzer is the first Quantum Cascade Laser (QCL) analyzer designed for industrial process applications requiring Class I, Division 2 hazardous area certification.
Built within a flameproof enclosure, the CT5800's unique cell design enables high accuracy measurement of concentrations of impurities down to low ppm levels in the gas streams, and is ideal for Hydrogen purity, Nitrogen purity and Ethylene purity applications. With up to six laser modules housed inside the same enclosure, the CT5800 analyzer can measure up to twelve components simultaneously, greatly reducing the need for multiple analyzers.
Rosemount™ CT5800 Continuous Gas Analyzer


Sample Gas Temperature
Humidity Range
10–95 %, non-condensing
Europe: ATEX II 2G Ex d IIB+H2 T4
North America: Class I, Division 2, Groups B, C, D, T4
Inlet gas port connector 6 mm (¼ in.) Swagelok type (specify on order)
Outlet gas port connector 6 mm (¼ in.) Swagelok type (specify on order)
Power Supply
120 VAC 60 Hz / 240 VAC 50 Hz 200 V/A
651.9 X 265.1 X 515.2 mm (25.67 x 11.54 x 20.28 in.)
85 kg (187.39 lbs)
Output Signal
Analog signal out 4–20 mA (1 per measurement)
Digital signal out Modbus over TCP/IP or RS-232
Health monitoring Digital healthline (1 per measurement) or NAMUR status report


  • Measure up to twelve gases simultaneously
  • Accurate and sensitive gas measurements
  • Excellent linearity of response and repeatability
  • Low long term drift minimizes calibration intervals
  • Low maintenance and low lifetime costs
  • Continuous health diagnostic reporting
  • Embedded ARM processor for fully autonomous operation
  • Intuitive simple front panel user interface allows access to all instrument functions
  • Interchangeable modular confi guration for up to six lasers


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