Analyzer Variables; Introduction - Emerson NGA2000 Reference Manual

NGA2000 Reference
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INTRODUCTION

This section describes the NGA analyzer
variables. This description is taken from the
"CSV" files that are used to build the software
CALSTAT
CONTROL
GAS
GENERALSTATE
I_TIME
IOHOLDCAL
MAXRANGE
MINRANGE
OPSTATUS
PROCESS
AFT90
Direction
Binding
Type
Value range
Units
Description
Usage
See also
ALARM_LVL
Direction
Binding
Type
Value range
Units
Description
Usage
See also
Rosemount Analytical Inc. A Division of Emerson Process Management
SECTION 2

ANALYZER VARIABLES

PVACEMS
PVU
RNGHI
RNGLO
SVCONT
SVNAME
TAG
TIME_LEFT
VALIDITY
Bidirectional
AFT90
4-element floating point
0.0-30
Seconds
Determines the filter time constant for the primary reading. This may be different
for each range - element 1 applies to range 1 and so on.
Setting this to 0 removes 0 filtering. Setting it to less than about 1 second
removes most of the median filtering, if the analyzer has any. Setting it higher will
remove noise from the signal, but at the expense of response time. Those
analyzers with inherently long response time, such as long cell IR analyzers,
should use larger numbers. Otherwise, set this as large as is consistent with the
response time you wish to obtain.
LONPVUPDATE
AMDELAYTIME
Bidirectional
None
Enumerated
ANY; WARNING; FAILURE; SAFETY FAILURE
None
Determines the level of alarm reported over the network.
The alarm task will report any alarms of equal or higher value than that selected.
It is impossible to stop safety failure alarms from being reported, although
currently these are only present in the FID analyzer. This variable may be
superseded in releases later than 2.2.
Reference Manual
for each NGA module, and where conflicts
exist, the "CSV" file takes precedence.
The following variables are defined in the
analyzer module and are also used by the I/0
module:
Analyzer Variables
748384-C
September 2003
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