B-45
TERM DEFINITION
Tuned Radio Frequency
An amplitude modulated (AM) receiver with one or more stages of radio
frequency before the detector.
TXD
Communication abbreviation for Transmit Data.
UDINT
Unsigned Double Integer
UL
Underwriters Laboratories, Inc. An independent laboratory that establishes
standards for commercial and industrial products.
Union
A form of pipe fitting where two extension pipes are joined at a separable
coupling.
Universal Serial Bus
An external peripheral interface standard for communication between a
computer and external peripherals over a cable using biserial transmission. It
supports both isochronous and asynchronous data transfers.
Unsigned Integer
Can represent a number twice the size of a “signed integer”, but cannot
represent a large negative number.
Upload
This refers to a Totalflow procedure in which any file(s) located in the on-board
memory of a Totalflow Host is copied to a file created on a laptop PC.
UPS
Un-interruptible power supply. A power conditioning unit placed between the
commercial power service and the protected device. The UPS uses line power
to charge batteries, which, in the case of a power failure, can drive electronic
circuitry to produce the appropriate AC requirements for some time period.
Upstream
Oil and natural gas exploration and production activities; plus gas gathering,
processing and marketing operations.
Upstream Pipeline
The first pipeline to transport natural gas en route to an inter-connect point for
delivery to another pipeline. See DOWNSTREAM PIPELINE.
USB
Acronym for Universal Serial Bus.
USB Client
Generally refers to the peripheral device (Slave or Client) that is driven by a
computer (Master or Host). Examples are a printer and digital camera.
USB Host
Generally refers to the computer device (Master or Host) that drives a
peripheral piece of equipment (Slave or Client). An example is a Laptop or
Desktop Computer.
USX
Provider of the RTOS used by the XSeries product line
VAC
Volts of alternating current.
Vacuum
A pressure less than atmospheric pressure, measured either from the base of
zero pressure or from the base of atmospheric pressure (PSIA).
Valve
A mechanical device for controlling the flow of fluids and gases; types such as
gate, ball, globe, needle, and plug valves are used.
Valve Control
This feature provides automatic feedback control of Differential Pressure (DP),
Static Pressure (SP), and Flow Rate for the purpose of positioning a flow valve
to maintain a desired value of DP, SP, or Flow Rate.
Vapor Pressure
The pressure exerted by a liquid when confined in a specified tank or test
apparatus.
VAS32
Totalflow’s Voice Alarm System. A software program that receives and
transmits alarm notifications via cell, telephone or pager systems.
VBATT
Battery Voltage. The voltage output from the battery source.
VCI
Valve Control Interface.
VDC
Volts of direct current.
VDE
Verband der Elektrotechnik Elektronik Informationstechnik [Association for
Electrical, Electronic & Information Technologies]
Velocity
The time rate of change of displacement; dx/dt.
Содержание XRC6490
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Страница 19: ...1 5 Standard Enclosure Cont RC 6790 X Figure 1 2 Model XRC6790 Continued on Next Page ...
Страница 20: ...1 6 Standard Enclosure Cont 18 00 15 52 RC 6890 X 28 81 15 52 28 00 20 09 18 70 Figure 1 3 Model XRC6890 ...
Страница 24: ...1 10 XRC 195 Board Specifications Cont Figure 1 5 Complete View XRC 195 Board Continued on Next Page ...
Страница 41: ...1 27 Totalflow Input Output Modules Cont Figure 1 16 XRC6990 Inside View ...
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Страница 56: ...2 14 AC Charging Unit Installation Cont Figure 2 12 DC Wiring Instructions Figure 2 13 AC Wiring Instructions ...
Страница 63: ...2 21 XRC Communication Jumper Settings and Field Wiring Cont Figure 2 19 Other Field Wiring I O Connections ...
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Страница 86: ...4 12 Replacing XRC 195 Board Cont Figure 4 5 XRC Board Connections ...
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Страница 112: ...5 24 12V Communication Supply Voltage Test Cont Figure 5 9 XRC 195 Communication Wiring ...
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