TotalFlow uFLO, User Manual, Page: 128 / 132

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Term Definition
TF.NET Totalflow network used to access iVision/web data.
Thermocouple A temperature sensor created by joining two dissimilar metals. The
junction produces a small voltage as a function of the temperature.
Thermowell A closed-end tube designed to protect temperature sensors from harsh
environments, high pressure, and flows. They can be installed into a
system by pipe thread or welded flange and are usually made of
corrosion-resistant metal or ceramic material depending upon the
application.
Therms Master Totalflow application for Gas Analyzer.
Tolerance The allowable percentage variation of any component from that stated on
its body.
Transducer A device for converting energy from one form to another, specifically the
measurement of pressure differential in natural gas gate stations. i.e.
Pressure to voltage or current.
Transfer Rate The rate, measured in bytes/s, at which data is moved from source to
destination after software initialization and set up operations; the
maximum rate at which the hardware can operate.
Transient An abrupt change in voltage, of short duration (e.g. a brief pulse caused
by the operation of a switch).
Transistor A three leaded device (Collector, Base, Emitter) used for amplifying or
switching. Also called a bi-polar transistor to distinguish it from Field Effect
Transistor etc.
Transmitter A device that converts audio, video or coded signals into modulated radio
frequency signals which can be propagated by electromagnetic waves
(radio waves).
Tranzorb Transient Voltage Suppression device.
Tube Cylinder for transporting or storing liquids: any long hollow cylinder used to
transport or store liquids.
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.
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 From a reference point, any point located nearer the origin of flow, that is,
before the reference point is reached.
Upstream Pipeline The first pipeline to transport natural gas en route to an inter-connect point
for delivery to another pipeline. See DOWNSTREAM PIPELINE.
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.