B-19
TERM DEFINITION
Event File
Stored records specifying a notable change. The XFC stores up to 200 records,
containing: Time, Day, Description, Old Value, New Value.
Events
Signals or interrupts generated by a device to notify another device of an
asynchronous event. The contents of events are device-dependent.
Ex Potential
Explosive.
EXIMV
Explosion Proof Integral Multivariable Transducer.
Expansion Board
A plug-in circuit board that adds features or capabilities beyond those basic to a
computer, such as a data acquisition system expansion board.
Expansion Factor
Correction factor for the change in density between two pressure measurement
areas in a constricted flow.
Expansion Slots
The spaces provided in a computer for expansion boards than enhance the
basic operation of the computer.
Explosion-proof Enclosure
Explosion Proof Enclosure for Class 1 Division 1 locations. An enclosure that
can withstand an explosion of gases within it and prevent the explosion of
gases surrounding it due to sparks, flashes or the explosion of the container
itself, and maintain an external temperature which will not ignite the
surrounding gases.
Extended Binary Coded
Decimal Interchange Code
EBCDIC. An eight-bit character code used primarily in IBM equipment. The
code allows for 256 different bit patterns.
External Multivariable
Transducer
Multivariable Transducer located outside of the Flow Computer enclosure.
Used in multi-tube configurations and on systems where the actual Flow
Computer is located at a distance from the flowing tube.
External Transducer
DP/SP Transducer located outside the enclosure. All electronics are located
inside the enclosure and communicate via a ribbon cable.
F.O.B.
Abbreviation of free on board with the cost of delivery to a port and loading onto
a ship included.
Fa
Orifice Thermal Expansion factor.
Fahrenheit
A temperature scale defined by 32° at the ice point and 212° at the boiling point
of water at sea level.
Faux
Full Well Stream Factor.
Fb
Basic Orifice factor.
FBD
Function Block Diagram (IEC supported programming language)
FCC
Federal Communications Commission.
FCU
Flow computer unit
Feed Points
Connections between gas feeder lines and distribution networks.
Feedback
Occurs when some or all of the output of the device (such as an amplifier) is
taken back to the input. This may be accidental (such as the acoustic feedback
from a speaker to microphone) or intentional , to reduce distortion.
Feeder (Main)
A gas main or supply line that delivers gas from a city gate station or other
source of supply to the distribution networks.
Feed-Through Assembly
The Feed-Through Assembly also serves as the connection for sample
streams, carrier gas and calibration streams, and contains the vents for sample
and column gases.
FET
Field-effect transistor. Transistor with electric field controlling output: a
transistor, with three or more electrodes, in which the output current is
controlled by a variable electric field.
Fg
Specific Gravity factor.
Field Pressure
The pressure of natural gas as it is found in the underground formations from
which it is produced.
Summary of Contents for XRC6490
Page 1: ...2100802 001 AB TOTALFLOW XSeries Remote Controller User s Manual ...
Page 6: ...iv B B Bl lla a an n nk k k P P Pa a ag g ge e e ...
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Page 19: ...1 5 Standard Enclosure Cont RC 6790 X Figure 1 2 Model XRC6790 Continued on Next Page ...
Page 41: ...1 27 Totalflow Input Output Modules Cont Figure 1 16 XRC6990 Inside View ...
Page 42: ...1 28 B B Bl lla a an n nk k k P P Pa a ag g ge e e ...
Page 64: ...2 22 B B Bl lla a an n nk k k P P Pa a ag g ge e e ...
Page 86: ...4 12 Replacing XRC 195 Board Cont Figure 4 5 XRC Board Connections ...
Page 88: ...4 14 B B Bl lla a an n nk k k P P Pa a ag g ge e e ...
Page 112: ...5 24 12V Communication Supply Voltage Test Cont Figure 5 9 XRC 195 Communication Wiring ...
Page 292: ...A 176 B B Bl lla a an n nk k k P P Pa a ag g ge e e ...
Page 340: ...B 48 B B Bl lla a an n nk k k P P Pa a ag g ge e e ...
Page 342: ...C 2 B B Bl lla a an n nk k k P P Pa a ag g ge e e ...
