Instruction manual

Instruction Manual
760006-A
September 2001
1-2 Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA 2000 Platform
The other thing to realize is that the LON is ex-
tremely reliable. Any apparent problem with it
has always been proved to be from some obvi-
ous error, like a broken wire. It is possible to
overload it, and there is information in this and
the reference manual about this, but once a
system has been setup the LON itself keeps
working. If there is a problem, look for other
things besides the LON to be at fault!
1-3 PLATFORM OVERVIEW
This manual describes the Control and I/O ca-
pabilities of the Platform part of an NGA 2000
system.
NGA 2000 system consists of three basic ele-
ments:
• Platform components
• Analyzer modules
• Input/Output (I/O) Modules
The Platform serves as a local operator inter-
face for up to six (ten for V2.3 and higher) Ana-
lyzer modules. It consists of a group of
components that can be assembled in many
different configurations depending on the user's
needs. It can be composed of any workable
collection of the following:
• Operator Interface - Front Panel,
Display and Keypad
• Power Input Module/ Power Supply
Board
• Platform Controller Computer
• One or more of a number of I/O
Modules
• Enclosure.
The Platform is also available in a dual version,
with two complete independent sets of elec-
tronics in one enclosure. Such dual versions
act as two separate Platforms and allow two in-
dependent Analyzer systems to be run from one
place. The front panel in this case consists of
two half panels directly mounted on the chassis
with no hinges.
The NGA 2000 family of gas Analyzer modules
utilizes proven methodologies such as:
• Non-dispersive infrared (NDIR) to
measure gases such as carbon
monoxide (CO), carbon dioxide
(CO
2
) and sulfur dioxide (SO
2
)
• Paramagnetic (PMD) for meas-
urement of oxygen
• Chemiluminescence (CLD) for
measurement of nitrogen oxides
(NO and NO
X
)
• Flame ionization detection (FID) for
measurement of total hydrocar-
bons (THC).
• Further modules made in Europe
and described in their own manu-
als. These include the MLT (a
multi-analysis module) and the
NGA 2000 II series.
These gas detectors are packaged in standard
sized modules that can be linked together via
the LON communications network. The modu-
larity of NGA 2000 allows for the use of multiple
interchangeable Analyzer modules with no
change in overall operational characteristics.
The I/O Modules provide signal input and output
capability outside of the NGA 2000 communica-
tions network and are designed for easy instal-
lation in the Platform. I/O Module options
provide analog and digital signals, dry contact
closures for alarms and calibration valve se-
quencing, and accept remote signals for range
change and calibration initiation. These I/O
Modules contain a small computer that operates
autonomously providing I/O capability through
the LON connection without burdening the
Analyzer module computers.
The SIO Board and DIO Board are extensions
to the Platform Controller Board. They plug into
the back of the Platform just as do the I/O Mod-
ule boards, but they do not contain on board
intelligence. The Platform will only accept one
SIO board but it is possible to add up to four
DIO boards - but only if the software in the
Platform is V3.3, or higher. (At the time of writ-
ing, this software is not available in the USA.)