TotalFlow XRC6490, User Manual

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B-25
TERM DEFINITION
Heavy Hydrocarbons More susceptible to increases in temperature and decreases in pressure, thus
causing liquids to form.
Heptane (C7H16) A saturated hydrocarbon (Alkane) with 7 carbon atoms in it’s molecule
(C7H16). A liquid under normal conditions.
Hertz Cycles per second. A measure of frequency or bandwidth.
Hexadecimal A numbering system to the base 16, 0 through F.
Hexane (C6H14)
A saturated hydrocarbon (Alkane) with six carbon atoms in it’s molecule
(C6H14). A liquid under normal conditions.
Hexane Plus or Heptane
Plus The portion of a hydrocarbon fluid mixture or the last component of a
hydrocarbon analysis which contains the hexanes (or heptanes) and all
hydrocarbons heavier than the hexanes (or heptanes).
Hierarchical A method of organizing computer programs with a series of levels, each with
further subdivisions, as in a pyramid or tree structure.
Hold Meter HOLD is an external input which is used to stop the A/D process and
freeze the display. BCD HOLD is an external input used to freeze the BCD
output while allowing the A/D process to continue operation.
Host The primary or controlling computer in a multiple part system.
Host Console Host Console via Local Port uses the PCCU cable between the computer and
the device’s Local PCCU port but running Remote Protocol. Host Console via
Remote Port uses the remote protocol
Hub A market or supply area pooling/delivery where gas supply transaction point
occur that serve to facilitate the movement of gas between and among
interstate pipelines. Transactions can include a change in title, a change in
transporter, or other similar items.
HV See Heating Value.
Hydrocarbon A chemical compound composed solely of carbon and hydrogen. The
compounds having a small number of carbon and hydrogen atoms in their
molecules are usually gaseous; those with a larger number of atoms are liquid,
and the compounds with the largest number of atoms are solid.
Hydrogen Sulfide A flammable, very poisonous and corrosive gas with a markedly disagreeable
odor, having the chemical formula of H
2
S that is a contaminant in natural gas
and natural gas liquids.
Hyperterm Terminal emulation program provided with Windows.
Hysteresis The maximum difference between output readings for the same measured
point, one point obtained while increasing from zero and the other while
decreasing from full scale. The points are taken on the same continuous cycle.
The deviation is expressed as a percent of full scale.
I/O See Input/Output.
I/O Address A method that allows the CPU to distinguish between the different boards in a
system. All boards must have different addresses.
I
2
C Inter-Integrated Circuit. Serial communications bus to I/O modules (developed
by Phillips Semiconductor)
IAR
Maker and distributor of the Embedded Workbench, a compiler, assembler,
linker development system for the Z80/64180 microprocessor family.
IC See Integrated Circuit
IC4 A standard abbreviation for Isobutane.
IC5 A standard abbreviation for Isopentane.
Icon A graphic functional symbol display. A graphic representation of a function or
functions to be performed by the computer.