TotalFlow XRC6490, Руководство пользователя

Страница: 319 / 342

B-27
TERM DEFINITION
Interference A disturbance to the signal in any communications system.
Intrinsically Safe An instrument which will not produce any spark or thermal effects under normal
and specified fault conditions, that is capable of causing ignition of a specified
gas mixture.
Inverter A circuit in both analogue and digital systems that provides an output that is
inverse to the input.
Inverter, DC to AC Converts DC to AC at a high frequency.
ioINT Interrupt signal from the I/O modules.
ioVBB i/o Battery Voltage- Unregulated 13.8 volts. Host supplies 2.5 amps to the I/O
modules.
ioVDD Unregulated 5.6 volts from the host for I/O modules.
ISA Instrument Society of America.
ISO International Standards Organization.
ISO 5167 International Standards Organization Report No. 5167, Measurement of Fluid
Flow by Means of Pressure Differential Devices.
ISO 6976-95 International Standards Organization Report No. 6976-95, Calculation of
Calorific Values, Density, Relative Density and Wobbe Index from Composition.
Isobutane (C4H10) A hydrocarbon of the same chemical formula as butane but different molecular
structure, resulting in different physical properties, notably lower boiling point.
Gross heating value 3261 Btu/cu. ft. gas.
Isokenetic Sampling Laboratory technique where gas sample is tested after removing liquids,
therefore not allowing the atomized liquid to return to the gaseous state,
changing the sample accuracy.
Isolation The reduction of the capacity of a system to respond to an external force by
use of resilient isolating materials.
Isopentane (C5H12) A hydrocarbon of the paraffin series having a chemical formula of C5H12 and
having its carbon atoms branched.
IUPAC Acronym for International Union of Pure and Applied Chemistry. It is an
international non-governmental organization devoted to the advancement of
chemistry. It is most well known as the recognized authority in developing
standards for the naming of the chemical elements and their compounds
IVision SCADA system designed for oil and gas applications
Joule The basic unit of thermal energy.
Joule-Thompson Effect The change in gas temperature which occurs when the gas is expanded at
constant enthalpy from a higher pressure to a lower pressure. The effect for
most gases at normal pressure, except hydrogen and helium, is a cooling of the
gas creating condensation.
K Kilo. 1) In referring to computers, a "kilo" is 1024 or 2 to the 10th power (Note
that it is actually slightly more than an even 1000.). 2) the standard metric prefix
for 1,000, or 10
3
, used with units of measure such as volts, hertz, and meters.
Kbytes/s A unit for data transfer that means 1,000 or 10
3
bytes/s.
Kerosene An oily liquid obtained in the distilling of gasoline in a temperature range from
174-288 degree C. A hydrocarbon of specific gravity of 0.747 to 0.775. Used as
fuel for some internal combustion engines, heating equipment, and illuminating
purposes. A heavy grade known as range oil is used for cooking and heating.
KHz Electronic abbreviation for Kilohertz.
kilobyte 1024 bytes.
Kilowatt Equivalent to 1000 watts.