Reference Manual
748384-C
September 2003
P-6 Preface
Rosemount Analytical Inc. A Division of Emerson Process Management
NGA2000 Reference
Polynomial
A mathematical term meaning an expression (a function of a variable) containing several terms, each of
which contains a power of he variable.
Power Supply
Any of a variety of components that provides conditioned power to other NGA2000 components, from the
Power Supply Board that plugs into the front of the Backplane in a stand-alone instrument to several larger
ones that can power larger collections of modules and components.
Primary Variable
The measured species concentration value from an Analyzer Module.
Range
The bounds of concentration over which the analyzer's reading is accurate, or possible.
Response Factor
The relative response of the analyzer to different gases to which it is sensitive.
Routers
A component (manufactured by Echelon Corporation) used to connect more than one control module to a
single computer.
Safety Failure
Indicates a failure of the analyzer safety system, with resultant shut down of the analyzer.
Secondary Variable
Data placed on the network by a module regarding current status, e.g., sample flow, source voltage and
other diagnostic information.
Serial Number
A number assigned to the module at time of manufacture. It is stored in the network variable AMSN, and
marked on a Name-Rating Plate on the module enclosure.
Serial I/O Module
A non-LON I/O module that can produce up to 8 channels of 12-bit analog outputs, as well as 3 alarm con-
tacts and a serial (either RS232 or RS485) port.
Single Autocal Module
Calibration of a single analyzer module or using separate zero and span gas paths into multiple analyzer
modules.
SIO
See Serial I/O Module.
