1
I
NTRODUCTION
748332-D Rosemount Analytical June 1997
1-1
NGA Non-Dispersive Infraraed Analyzer
1.1 OVERVIEW
This manual describes the Non-Dispersive Infrared (NDIR) Analyzer Module of
Rosemount Analytical's NGA 200 Series of gas analysis components. See Figure 1-1.
The NDIR Analyzer Module is designed to continuously determine the concentration
of oxygen in a flowing gaseous mixture. The concentration is expressed in one of
three fashions:
•
parts-per-million
•
percent of composition
•
percent of fullscale
The user can obtain an output that is linear with concentration by initiating a linearizer,
which is based on a fourth-order polynomial. The linearizer is incorporated in the
Analyzer Module's electronic circuitry and is adjustable through interconnection with
the network.
The entire Analyzer Module is designed as a slide-in module (if configured in stand-
alone instrument fashion), removable from the front of the Platform, with gas
connections made from the rear. All electronics relative to sample detection and
conditioning are included in this module.
1.2 TYPICAL APPLICATIONS
The NDIR Analyzer Module is designed to cover a wide range of process, stack and
automotive applications. Typical measurements include:
C
HEMICAL AND
P
ETROLEUM
•
Carbon dioxide: Manufacture of ethylene oxide, phthalic anhydride and
ammonia; nitrogen generation; and producer gas monitoring
•
Carbon Monoxide: Stack monitoring
•
Methane: Ammonia manufacture
•
Acetylene: Manufacture of acetylene, acrylonitrile, and vinyl chloride
•
Sulfur Dioxide: Sulfuric acid stack gas
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