TotalFlow XRC6490, User Manual

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B-16
TERM DEFINITION
DIP Switches A bank of switches typically used in setting the hardware configuration and
base address of an option card.
Direct Current A current that does not change in direction and is substantially constant in
value.
Direct Memory Access A method by which information can be transferred from the computer memory
to a device on the bus without using the processor.
Discharge The conversion of chemical energy of a cell/battery into electrical energy and
withdrawal of the electrical energy into a load.
Discharge Rate
The rate, usually expressed in amperes, at which electrical current is taken
from the cell/battery.
Discrete Manifold Also called Tubing Manifold. Used in instances when the XFC is not mounted
directly on the Orifice, usually pipe mount or wall mount.
Distillates The distillate or middle range of petroleum liquids produced during the
processing of crude oil. Products include diesel fuel, heating oil, kerosene and
turbine fuel for airplanes.
Distillation The first stage in the refining process in which crude oil is heated and
unfinished petroleum products are initially separated.
Distribution The act or process of distributing gas from the city gas or plant that portion of
utility plant used for the purpose of delivering gas from the city gate or plant to
the consumers, or to expenses relating to the operating and maintenance of
distribution plant.
Distribution Company Gas Company which obtains the major portion of its gas operating revenues
from the operation of a retail gas distribution system, and which operates no
transmission system other than incidental connections within its own system or
to the system of another company. For purposes of A.G.A. statistics, a
distribution company obtains at least 90 percent of its gas operating revenues
from sales to ultimate customers, and classifies at least 90 percent of mains
(other than service pipe) as distribution. Compare INTEGRATED COMPANY;
TRANSMISSION COMPANY, GAS.
Dkt Abbreviation for Decatherm, equivalent to one MMBtu.
DMM Digital Multi-Meter.
DN Inside diameter standard.
DOS Disk Operating System.
DOS CCU Refers to the DOS version of the Calibration and Collection Unit. Also known as
FS/2, hand held or Dog Bone.
DOT Matrix A group of dots/pixels forming a character or symbol, usually five dots across
and seven dots down.
DOT/Pixel An active element that forms a character or symbol when combined in a matrix.
Download This refers to a Totalflow procedure in which any file(s) located on a laptop PC
or storage device, may be copied to the on-board memory of a Totalflow Host
device for purposes of restoring, configuration or repair.
Downstream The oil industry term used to refer to all petroleum activities from the processing
of refining crude oil into petroleum products to the distribution, marketing, and
shipping of the products. Also see Upstream.
Downstream Pipeline The pipeline receiving natural gas at a pipeline inter-connect point.
DP See Differential Pressure.
DRAM See Dynamic Random Access memory.
Drift A change of a reading or a set point value over long periods due to several
factors including change in ambient temperature, time, and line voltage.