Emerson Rosemount CT4400, Справочное руководство

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1.3 System overview
A complete Rosemount CT4400 system consists of the analyzer, and the associated
interconnecting wiring and gas piping.
Measurement data from the analyzer can be displayed in the process control center. You
must provide a stable gas handling system and interconnecting wiring and gas piping;
Rosemount will supply the analyzer.
In Figure 1-3 , the items supplied by Rosemount are colored orange; the items supplied by
the Customer are colored blue. Table 1-1 lists the main items of the system.
Figure 1-3: Complete Rosemount CT4400 Gas Analysis System
A. Gas handling system
B. Sample supply line
C. Sample return (exhaust) line
D. Rosemount CT4400 Gas Analyzer
E. Electrical power
F. Measurement data
G. Control center
The analyzer contains an optical system with a laser, components that provide an optical
path, sample inlet/outlet ports that can be connected to a customer provided gas
handling system and control/analysis electronics. The complete system operates from
either a 110 Vac 60Hz or a 230 Vac 50Hz supply.
Gas concentrations are measured using mid-infrared optical absorption spectroscopy. The
light source is provided by a quantum cascade laser or tuned diode laser, which produces
wavelength sweeps that cover the absorption lines of the gases. The light from the laser is
routed through an optical path to the analysis cell, which provides measurement of low
concentrations of the sample gas. An external sample handling system conditions the
sample gas and draws it through the analysis cell. The laser light exiting the multi-pass
analysis cell is directed to a receiver in the analyzer. The variation in the intensity of the
light in the vicinity of the absorption lines is measured, and the concentration is
determined using a spectral fitting routine.
There is no sample conditioning provided within the analyzer; this is the responsibility of
the Customer. The sample gas must be conditioned as detailed in
Sample gas conditioning
requirements before entering the analyzer. Detailed characteristics of the analyzer are
given in Detailed system specifications .
Reference Manual Plan
00809-0100-4244 January 2020
Reference Manual 15