Instruction manual

Instruction Manual
760006-A
September 2001
P-8 Preface Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA 2000 Platform
TAG
The name of a module. This may be defined by the user. It is used to identify the module both in the menu
system and through the PC interface. See also AMSN, or Serial number.
Technical Level
In the NGA 2000 menu system, refers to the controls and configuration capability, and diagnostic informa-
tion appropriate for Analyzer technicians.
THC
Total Hydrocarbons, a term for the total quantity of hydrocarbons present, regardless of their type.
Tweak
A slang term meaning to adjust. Used in the NGA 2000 system specifically to describe a process of modi-
fying the linearity of an NGA 2000 Analyzer.
Validity
A concept used to describe a condition in which gas concentration values present on the Operator Interface
or output lines should be considered valid or invalid. The Analyzer module alerts the system that an error in
gas concentration is present. Causes include failure or lack of calibration, flame out in a FID, or a not-from-
process gas applied by a sample control module.
VBA
Visual Basic for Applications - Microsoft's version of Visual Basic that they supply built into their main appli-
cations such as Excel or Word. It is similar but not identical to the stand-alone Visual Basic, and each vari-
ety has its own idiosyncrasies.
Warning
A form of alarm: a warning indicates one or more software configured limits on any network variable (other
than gas concentration) has been exceeded. Examples of these secondary variables are flow rate and in-
ternal voltage. A warning indicates that the Analyzer reading may not be correct.
Zero
To make the Analyzer read zero on zero gas, by calibrating its offset. Also the operation that accomplishes
this.