Simultaneous Dual Detectors - ABB PGC2000 Operation And Service Manual

Simultaneous Dual Detectors

Simultaneous dual detectors function in parallel using any two detectors. To accomplish this
simultaneous processing requires one Chroma I/O Board in the analyzer for each detector. Chroma
I/O Board #1 is in GCC Card Cage slot 2 and Chroma I/O Board #2 is in slot 1. Stream assignments
and method tables determine which detector processes each stream and method. Since sample flow
through the detectors is application-specific, refer to the Data Package for this information.
The same Method Table cannot be used for both Chroma I/O Boards. Each
Chroma I/O Board must have its own calibration stream. Normalized analyses do
not normalize across detectors.
There are two modes of running simultaneous dual detectors.
• In the Master/Master mode each Chroma I/O Board controls a separate sample system, which
allows totally independent analyses to be run simultaneously.
•
In the Master/Slave mode there is only one sampling system. The methods assigned to the
Master Chroma I/O (Chroma Bd #1) perform the stream stepping and control the analysis time.
The slave (Chroma Bd #2) starts its cycle simultaneously with the master, but the slave's cycle
time is shorter than that of the master. When the slave completes its analysis it waits until the
beginning of the next master cycle to start another run.
All stream and valve outputs originate in Chroma I/O Board #1 (the total number of streams and
valves for any particular GCC configuration remains the same).
Alarm inputs generic to the GCC (e.g., purge air) connect to both Chroma I/O Boards. Detector
specific alarm inputs connect to the appropriate Chroma I/O Board.
Each Chroma I/O Board can have up to five user-defined sensors. However, you can assign a total
of only five sensor names, so the sensors for the two boards share sensor names (i.e., Sensor #1 for
Chroma I/O Board #2 may differ from Sensor #1 for Chroma I/O Board #1, but they have the same
sensor name).
When the Simultaneous Dual Detector option is installed, many screens and functions change to
support this option. The Background screen shows data for both Chroma I/O Boards all the time (see
2000-OSM, F1
NOTE
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