Instruction manual

Instruction Manual
760006-A
September 2001
P-4 Preface Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA 2000 Platform
GLOSSARY OF TERMS
30 A Bulk Power Supply
A power supply that is mounted in an enclosure capable of supplying power (+24 VDC @ 30 Amperes) to
up to ten Analyzer modules installed in the NGA 2000 System.
AK
A serial interface protocol, popular in Europe in the automotive industry.
AMSN
Network variable name containing the module Serial number. This should be the same as the number
physically marked on the unit.
Alarm
An indication (normally) of an out-of-normal circumstance. This covers status indications, concentration
limit violation, internal limit violations or an internal problem. Alarms may be indicated to the user either
visually or through a relay contact closure.
Analyzer module
Self contained analysis modules that are designed to be installed into the NGA 2000 System. One Analyzer
module can be installed into a Single Enclosure containing the Platform Module. Two Analyzer modules
can be installed into a Dual Enclosure. The simplest NGA 2000 System consists of one Analyzer module.
Backplane
The Controller Board, Power Supply Board, I/O Board(s) and Expansion Board(s) are plugged into the
Backplane
Basic Controls
In the NGA 2000 menu system, refers to the controls appropriate for normal operator use. These include
such things as range changing, zeroing the Analyzer, and lighting the flame on a FID Analyzer.
Bench
The physical measuring device within the Analyzer module. It comes from the term Optical Bench, de-
scribing the specialized optical components used in the original Analyzers.
Binding
A process by which Analyzer modules and I/O modules are instructed with whom to communicate over the
LON. Once bound, variable updates from one module are automatically transferred to the other.
Calibrate
In Internal Combustion Exhaust Emissions monitoring, to zero, span and linearize an Analyzer. In other in-
dustries, to zero and span an Analyzer.
Calibration cycle
A procedure for making an Analyzer read sample gases correctly. It involves flowing zero gas, waiting for
stabilization, causing the Analyzer to adjust its zero offset, and then doing the same for one or more span
gases with adjustment of span factors as required.
CLD
Chemiluminescence Detector - a term for the type of Analyzer that measures nitrogen oxides by measuring
the light emitted when nitric oxide reacts with ozone.