Emerson NGA2000 Reference Manual page 123

NGA2000 Reference
VOLTS_IS
Direction
Binding
Type
Value range
Units
Description
Usage
See also
ZERO
Direction
Binding
Type
Value range
Units
Description
Usage
See also
ZERO_COMP
Direction
Binding
Type
Value range
Units
Description
Usage
See also
Rosemount Analytical Inc. A Division of Emerson Process Management
Output
None
5-element (6-element in FED, CLD) floating point array
Nominal voltage ± about 2V
Volts
Reports internal power supply voltages:
+15 V
-15 V
+ 5 V; +10 V FID
+24 V; polarizing voltage (~95 V) FID
+12 V; not on FID On HFID, 10 V reference.
+10 V CLD only
Reports internal power supply voltages. Note that a significant error in the +5 V supply
will not be reported as it will stop the computer from working.
AMVOLTSWAS
Bidirectional
None
4-element floating point array
Around 500,000 except CLD, 32,000
None
Zero offset. Element 1 refers to the zero offset for range 1, etc.
Contains the zero offsets used in the main PVA calculation. During zero calibration,
these are adjusted such that the value of PVA resulting is within 0.02% of the full scale
range value of the appropriate element of ZEROGAS. If CALCHCKLIMITS is set to
enabled, this will fail if the change required is greater than the percentage of the full
scale value given in CALFAIL. The value of ZERO should be the same as the value of
RAW-SIGNAL while zero gas is flowing, and a zero may be effected by simply copying
the value of RAW-SIGNAL into the appropriate element of ZERO.
SPAN_GOOD
ZEROGAS
ZERO_WAS
Bidirectional
None
Floating point
Around 0
None
NDIR and PMD only; determines the temperature compensation for the offset
coefficient.
Used to set the zero temperature compensation in the NDIR and PMD analyzers.
SPAN_COMP
Reference Manual
748384-C
September 2003
Analyzer Variables 2-61