Emerson NGA2000 Reference Manual page 100

Reference Manual
748384-C
September 2003
MOD_TEST_TXT
Direction
Binding
Type
Value range
Units
Description
Usage
See also
NO_NOX
Direction
Binding
Type
Value range
Units
Description
Usage
See also
NONNETVARS
Direction
Binding
Type
Value range
Units
Description
Usage
See also
NOSPANGAS
Direction
Binding
Type
Value range
Units
Description
Usage
See also
2-38 Analyzer Variables
Output
None
Enumerated
None
NDIR only; messages and instructions for the modulation test screens.
Used to show the present status of the modulation test, and to give instructions as to
what the user should do next. The MOD_TEST_xxx variables share data, they will
always contain the same value, although the phrases to which this value refers are
different for each variable.
MOD_TEST_INS
MOD_TEST_THN
MCHECKTIME
Bidirectional
NO_NOX
Enumerated
NO; NOx
None
CLD only; controls state of NO/NOx toggle.
When in NOx mode, allows the sample to pass through the converter. When in NO
mode, bypasses this. The variable GAS is set to whichever of setting is appropriate.
GAS
Output
None
String
31 characters
None
Non-volatile storage for various internal parameters.
This variable is used to store various internal parameters in EEPROM. It is not
meaningful to anyone else. Trying to read it will crash the Echelon DDE server, as it
does not contain ASCII characters necessarily.
Bidirectional
None
4-element floating point array
Typically 80% of RNGHI
ppm
CLD only; contains the value of NO span gases, element 1 containing the span gas
for range 1 etc.
During a span function, when in NO mode, 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 NOSPANGAS, 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
NGA2000 Reference
Rosemount Analytical Inc. A Division of Emerson Process Management