Emerson NGA2000 Reference Manual page 115

NGA2000 Reference
SPANGAS
Direction
Binding
Type
Value range
Units
Description
Usage
See also
SPANWAS
Direction
Binding
Type
Value range
Units
Description
Usage
See also
ST1NAME
Direction
Binding
Type
Value range
Units
Description
Usage
See also
Rosemount Analytical Inc. A Division of Emerson Process Management
Bidirectional
None
4-element floating point array
Typically 80% of RNGHI
ppm
Contains the value of span gases, element 1 containing the span gas for range 1 etc.
During a span function, the analyzer adjusts the value of SPAN for the selected range
such that the value of PVA becomes equal to the value of the appropriate element of
SPANGAS, to within 0.02% of the range value. This variable should be kept updated
with the current value of the span gas as shown on the bottle label. If the bottle is of
dubious quality, it may be desirable to compare its reading with that of a known good
standard, and then mark the bottle and this variable accordingly.
SPAN
SPANWAS
Bidirectional
None
4-element floating point array
Each element typically around 0.0005, depending on range and analyzer.
None
The value of the span factor SPAN at manufacturing checkout time.
The check out personnel copy a known good set of span coefficients into this variable,
and then if desired the user can copy them back into SPAN.
SPAN
SPAN_GOOD
Analyzer input
None
Single element enumeration
NORMAL, MAINTENANCE REQUEST, FAILURE, CAL IN PROGRESS, ZERO IN
PROGRESS, SPAN IN PROGRESS, ZERO FAILED, SPAN FAILED, RANGE
OVERFLOW. RANGE UNDERFLOW, FLOW TOO LOW, FLOW TOO HIGH, INVALID
SELECTION, RANGE 1, RANGE 2, RANGE 3, RANGE 4
None
Each bit of the first and second element of STCONT shows the state of the
corresponding alarm named in this variable; These are standard alarms supported by
each analyzer. MAINTENANCE REQUEST means that GENERALSTATE is greater
than 0; FAILURE that it is equal to' FAILURE. RANGE OVERFLOW means that the
reading is greater than the CURENTRNGHI value, RANGE UNDERFLOW that it is
less than the RNGHI value of the range below the present one. INVALID SELECTION
is not shown on the display.
Used to allow the 1/0 Module to select which specific alarm to assign to which relay.
These values are shown on the 1/0 module alarm selection menu.
ST2NAME
ST3NAME
ST4NAME
STCONT
Reference Manual
748384-C
September 2003
Analyzer Variables 2-53