Emerson Rosemount 700XA Reference Manual page 4

RxD, RD, or S Receive data, or signal in.
in
TCD Thermal conductivity detector. A detector that uses the thermal conductivity of the different gas components
to produce an unbalanced signal across the bridge of the preamplifier. The higher the temperature, the lower
the resistance on the detectors.
TxD, TD, or S Transmit data, or signal out.
out
System description
The Rosemount 700XA is a high-speed gas chromatograph (GC) system that is engineered to meet specific field application
requirements based on typical hydrocarbon stream composition and anticipated concentration of selected components. In its
standard configuration, the analyzer can handle up to eight streams: seven sample streams and one calibration stream.
The Rosemount 700XA system consists of two major parts: the analyzer assembly and the electronics assembly. Depending upon
the particular GC, there may also be a third, optional, assembly called the sample conditioning system (SCS).
The electronics and hardware are housed in an explosion-proof enclosure that meets the approval guidelines of various certification
agencies for use in hazardous environments. See the certification tag on the GC for specific details about agency approvals.
Analyzer assembly
The analyzer assembly includes:
■ Columns
■ Thermal conductivity detectors (TCDs)
■ Flame ionization detectors (FIDs)
■ Flame photometric detector (FPD)
■ Preamplifer
■ Preamplifier power supply
■ Stream switching valves
■ Analytical valves
■ Solenoids
Additionally, the Rosemount 700XA can be equipped with a liquid sample injection valve (LSIV) or methanator.
For more information, see Upper
Electronics assembly
The electronics assembly includes the electronics and ports necessary for signal processing, instrument control, data storage,
personal computer (PC) interface, and telecommunications.
The operator uses the electronics assembly and MON2020 to control the gas chromatograph (GC). Refer to
for more details.
The GC-to-PC interface provides you with the greatest capability, ease-of-use, and flexibility. You can use MON2020 to edit
applications, monitor operations, calibrate streams, and display analysis chromatograms and reports, which can then be stored as
files on the PC's hard drive or printed from a printer connected to the PC.
4
compartment.
July 2020
Electronics hardware
Emerson.com/Rosemount