B-24
TERM DEFINITION
GPV
Gauge Port Vent. Refers to the NGC8200 Port designed to equalize the
pressure inside of the explosion-proof enclosure.
GPV
Gauge Port Valve (located on NGC8200 series Feed-Through Assembly).
GRD See
Ground.
Gross Heating Value
The heating value measured in a calorimeter when the water produced during
the combustion process is condensed to a liquid state. The heat of
condensation of the water is included in the total measured heat.
Ground
1) An electronically neutral circuit having the same potential as the surrounding
earth. Normally, a non-current carrying circuit intended for the safety purposes.
A reference point for an electrical system. 2) A large conducting body (as the
earth) used as a common return for an electric circuit and as an arbitrary zero
of potential. 3) Reference point for an electrical system.
Grounding Strap
A grounding strap is a conductive device used to make connection between the
person handling the board, and a high quality ground potential.
H2
The molecular formula for Hydrogen.
H2S
The molecular formula for Hydrogen Sulfide.
Half Duplex
Communication transmission in one direction at a time.
Handshake
An interface procedure that is based on status/data signals that assure orderly
data transfer as opposed to asynchronous exchange.
Handshaking
Exchange of predetermined signals between two devices establishing a
connection. Usually part of a communications protocol.
Hardware
The physical components of a computer system, such as the circuit boards,
plug-in boards, chassis, enclosures, peripherals, cables, and so on. It does not
include data or computer programs.
Harmonic
A sinusoidal component of a waveform that is a whole multiple of the
fundamental frequency. An oscillation that is an integral sub-multiple of the
fundamental is called a sub-harmonic.
HART Communication
Interface.
Hazardous Area
Area in which an explosive gas atmosphere is present or may be expected to
be present.
Heat
Thermal energy. Heat is expressed in units of calories or Btu's
Heat Capacity
The amount of heat required to raise the temperature of a body (of any mass)
one degree Celsius.
Heat of Condensation
The amount of heat that must be removed from one gram of a vapor at it's
condensation point to condense the vapor with no change in temperature.
Heat of Vaporization
The amount of heat required to vaporize one gram of a liquid at its boiling point
with no change in temperature. Usually expressed in J/g. The molar heat of
vaporization is the amount of heat required to vaporize one mole of liquid at its
boiling point with no change in temperature and usually expressed ion kJ/mol.
Heat Transfer
A form of energy that flows between two samples of matter because of their
differences in temperature.
Heating Value
The amount of heat developed by the complete combustion of a unit quantity of
a material. Heating values for natural gas are usually expressed as the Btu per
Cf of gas at designated conditions (temperature and pressure) and either on
the dry or water saturated basis.
Heavy Crude
Crude oil of 20-degree API gravity or less; often very thick and viscous.
Heavy Ends
The portion of a hydrocarbon mixture having the highest boiling point. Hexanes
or heptanes and all heavier hydrocarbons are usually the heavy ends in a
natural gas stream.
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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