I
NTRODUCTION
1-2
June 1997 Rosemount Analytical 748332-DNGA Non-Dispersive Infraraed Analyzer
F
OOD AND
A
GRICULTURE
•
Carbon Dioxide and Water Vapor: Blanketing of perishables, fermentation
processes, photosynthesis studies, personnel protection
A
EROSPACE AND
O
CEANOGRAPHY
•
Carbon Dioxide, Carbon Monoxide, and Water Vapor: Diving and space
chambers
M
ETALS AND
C
ERAMICS
•
Carbon Dioxide: Monitoring of producer gas, steel converting, manufacture of
cement, soaking pit, heat treating
•
Carbon Monoxide: Inert gas generation, producer gas monitoring, rotary kiln
roasting, tin plate annealing, steel converting, aluminum power processing,
porcelain kilns, tunnels
•
Water Vapor: Heat treating, hydrogen brazing, nickel and chrome plating
•
Sulfur Dioxide: Flash smelting
•
Ammonia: Ammonia dissociation
1.3 THEORY OF TECHNOLOGY
Inside of the Analyzer Module, two equal-energy infrared beams are directed through
two parallel optical cells, a flow-through sample cell and a reference cell. The
reference cell may be sealed or may contain a continuously flowing reference gas.
(See Figure 1-2.)
The infrared radiation is interrupted by a chopper at a frequency of 5 Hz.
During analysis, a portion of the infrared radiation is absorbed by the component of
interest in the sample. The quantity of infrared radiation that is absorbed is
proportional to the component concentration.
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