15 XFC G4 2103335 Rev AB
3 System Description
3.1 Overview
This chapter serves as an introduction to the Totalflow Fourth Generation Flow Computers (XFC
G4
). The XSeries are low power,
microprocessor-based units designed to meet a wide range of measurement, automation, monitor, control and alarm
applications for remote oil and gas systems. Six models of the XSeries are available: Models XFC
G4
6410, XFC
G4
6413 and
XFC
G4
6713 are differential (orifice) meters. Models XFC
G4
6411, XFC
G4
6414 and XFC
G4
6714 are pulse (linear) meters.
The letters XFC stand for Expandable Flow Computer. As the name implies, the flow computers are expandable to meet a wide
range of user needs while maintaining backward compatibility with legacy Totalflow systems.
For users that are familiar with the XSeries flow computers, the XFC
G4
offers easily recognizable features while expanding on its
core functionality. This expansion includes a new CPU engine card and the adoption of 32-bit technology to enhance speed and
memory. Additionally, the XFC
G4
is able to run more applications than previous XSeries units with more AGA tube applications
and more Plunger Lift applications.
For connectivity purposes, the XFC
G4
supports the familiar military connector (serial communication) PCCU cable. Additionally,
USB and Ethernet connectivity are also available. The only other visual difference is the addition of an SD Card slot, the SD
card slot is not used.
3.1.1 Hardware
The models XFC
G4
6410 and XFC
G4
6411 are packaged in a small enclosure and are only designed for the XFC
G4
board and a
variety of batteries. When using these flow computers, communication devices can be installed in a separate enclosure such as
the model 6470.
The models XFC
G4
6413 and XFC
G4
6414 are packaged in an enclosure that can accommodate the XFC
G4
board, a variety of
remote communications devices, batteries and up to three additional I/O modules. The I/O modules generally provide eight I/O
points per module.
The models XFC
G4
6713 and XFC
G4
6714 are packaged in an enclosure that can accommodate the XFC
G4
board, a variety of
remote communications options, batteries and up to six additional I/O modules.
3.1.2 Functionality
The XFC
G4
system has built-in, pre-engineered applications for data collection, trending and long term data storage. The XFC
G4
can be used for oil and gas production, transmission and distribution site monitoring and control, water and waste system
monitoring and control, etc.
All of the XSeries feature single or multi-tube capabilities with custody transfer measurement features. These flow computers
are engineered to be flexible and will enable the user to increase productivity and improve asset utilization (see Table 1 for the
XSeries family genealogy).
The XFC
G4
defaults to the retention of daily and log period records over a 40 day period. Additionally, it defaults to the retention
of 200 events. These defaults can be extended and are limited only by the file space on the device.
Models XFC
G4
6410/11 perform these basic functions and include additional I/O, as provided on the main electronic board
(XFC
G4
).
Models XFC
G4
6413/14 perform these same basic functions and have the option for three TFIO modules.ds
Models XFC
G4
6713/14 perform these same basic functions and have the option for six TFIO modules.
IMPORTANT NOTE: The XFC
G4
maintains a history of alarms as well as average differential pressure (DP),
average static pressure (SP), average flowing temperature (Tf), accumulated volume and energy.
For the differential meters, an average extension is maintained. For pulse (linear) meters, an uncorrected
volume accumulator is maintained.
The differential (orifice) flow computer can be programmed to calculate flow rates and volumes in accordance
with either AGA-3-85, AGA-3-92 or additional flow calculations methods that are available on request. These
include ISO-5167, Liquid, Vcone, FloNozzle, etc.
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