Emerson Rosemount CT4400 Reference Manual page 20

Plan
January 2020
Table 1-4: Environmental Characteristics
Environmental characteristic
Overvoltage category
Pollution degree
Note
The Rosemount CT4400 Continuous Gas Analyzer is suitable for indoor use only.
1.8.1 Sample gas conditioning requirements
The sample gas temperature in
analyzer can operate within.
The sample gas pressure in
operate within. The sample gas pressure MUST not fluctuate more than -10 percent to
ensure steady state conditions are being analyzed at all times. Sudden fluctuations in
pressure will affect the analysis being performed.
In the event of a power failure any residual sample gas should be purged from the analyzer
to ensure any corrosive gas elements are not left to contaminate/degrade the internal
components. Failure to do so could result in irreparable damage to the analyzer.
Sample filtration may be required to ensure the gas sample particulate size and density
does not exceed the requirements in
1.8.2 Optical description
The laser module is located in the core of the analyzer and the laser light beam passes
through the sample cell. The sample cell contains a set of mirrors to create a path through
the sample gas that is between 6.56 ft. (2 m) and 16.4 ft. (5 m) through multiple
reflections of the laser beam in the cell. The laser beam exits the cell at the opposite end
from where they entered and are directed using an optical block to a receiver.
By measuring and analyzing the light detected by the receiver unit, it is possible to
accurately determine the concentration of the target molecules within the gas sample.
20
(continued)
Value Units
II N/A
2 N/A
Table 1-4
Table 1-4 shows the pressure range that the analyzer can
Table
Comment
Numeral defining a transient
overvoltage condition.
Overvoltage Category ll is
for equipment intended to
be supplied from the
building wiring.
Numeral indicating the level
of pollution that may be
present in the environment.
Pollution degree 2: only
non-conductive pollution
occurs except that
occasionally a temporary
conductivity caused by
condensation is expected.
indicates the temperature range that the
1-4.
Reference Manual
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Rosemount CT4400