Emerson Rosemount 700XA Reference Manual page 94

Installation and start-up
June 2022
4. On the Application → Timed Events screen, filter the configured events as per train
4.4.17
Use this feature to configure a single analysis clock or multiple clocks.
One analysis clock can be considered as one virtual gas chromatograph (GC) that has
independent Sample Loop, Analytical Path, and Timed Event tables.
Multiple analysis clocks can run independently to analyze multiple streams at the same
time. Emerson sets the number of analysis clocks at the factory per the mechanical
configurations of the GC.
Mechanical
configurations
Trains (1 - 6)
Default Stream
Sequence (Def
Strm Seq)
Purge Duration
Energy Value
Check
1. Press Insert to add a new analysis.
2. Press Delete to delete an analysis.
94
valve or DO to multiple trains, but you can configure the same detector to multiple
trains.
selection by selecting the Train# check box.
Description
The configured trains that are used by the analysis
Sets the default sequence to be used by the indicated analysis during auto-
sequencing.
The amount of time, in seconds, to purge the stream before starting an
analysis, calibration, or validation run. The default value is 60 SEC. Purging
allows sample gas to flow through the sample loop prior to beginning the
run.
If enabled, the GC analyzes the calibration gas as an unknown stream and
computes its energy value. The GC then compares this value to the Cal Gas
Cert CV and determines if the calibration gas's energy value is within the CV
Check Allowed Deviation. If it isn't, the GC triggers the Energy Value Invalid
alarm. The following conditions must be met before the GC can perform a EV
Check:
• The EV Check flag on the System screen must be enabled.
• At least one stream must be set up in the Streams screen as a calibration
stream, and the Auto flag for this stream must be enabled.
The EV Check is performed under any of the following circumstances:
• During a warm start that follows a power failure during normal operation.
The GC waits for the heater and electronic pressure controller (EPC) to
reach their respective set points and stabilize. It then analyzes the
calibration gas as an unknown stream and identifies the peaks. If all the
component peaks are identified, the GC computes the calibration gas'
energy value and performs the EV Check.
• After a successful calibration, the GC computes the gas's energy value
with the new response factors and performs the EV Check
Reference Manual
2-3-9000-744
Emerson.com/Rosemount