Emerson Rosemount 700XA, Reference Manual

Page: 27 / 294

For calibration, the controller assembly may average several analyses of the calibration
stream.
1.4.9 Basic analysis computations
Two basic analysis algorithms are included in the controller assembly:
Area analysis Calculates area under component peak.
Peak height analysis Measures height of component peak.
NOTICE
Consult the Rosemount MON2020 Software for Gas Chromatographs Reference Manual
for more information.
Concentration analysis - response factor
Concentration calculations require a unique response factor for each component in an
analysis. These response factors may be manually entered by an operator or determined
automatically by the system through calibration procedures (with a calibration gas
mixture that has known concentrations).
The response factor calculation, using the external standard, is:
where
ARF
n
Area response factor for component n in area per mole percent
Area
n
Area associated with component n in calibration gas
Cal
n
Amount of component n in mole percent in calibration gas
Ht
n
Peak height associated with component n mole percent in calibration gas
HRF
n
Peak height response factor for component n
The controller assembly stores calculated response factors to use in the concentration
calculations; these response factors are printed out in the configuration and calibration
reports.
Average response factor is calculated as follows:
where
RFAVG
n
Area or height average response factor for component n
Reference Manual Overview
2-3-9000-744 June 2022
Rosemount 700XA 27