TotalFlow XRC6490, Руководство пользователя

Страница: 320 / 342

B-28
TERM DEFINITION
kilowatt-hour A unit of energy when one kilowatt of power is expended for one hour. Example
A radiator bar is usually rated at 1,000 watts and this switched on for one hour
consumes one kilowatt-hour of electricity.
KPa Kilopascal-Measure of Pressure
kw See Kilowatt.
kwh See Kilowatt-hour.
LACT Lease Automatic Custody Transfer.
Lag 1) A time delay between the output of a signal and the response of the
instrument to which the signal is sent. 2) A time relationship between two
waveforms where a fixed reference point on one wave occurs after the same
point of the reference wave.
Latent Heat of Vaporization Represents the amount of heat required to vaporize a liquid. In the instance of
natural gas, the equation appears: 1 Btu = heat to change. This is the most
likely scenario for causing gas to liquefy.
LCD Liquid Crystal Display.
LD Ladder Diagram (IEC supported programming language)
LED Light Emitting Diodes.
LevelMaster Intelligent Digital Level Sensor and is designed for custody transfer accuracy in
demanding level measurement applications in tanks. LevelMaster is the name
of the Totalflow’s Tank Gauging System.
Life For rechargeable batteries, the duration of satisfactory performance, measured
in years (float life) or in the number of charge/discharge cycles (cycle life).
Life Cycle The minimum number of pressure cycles the transducer can endure and still
remain within a specified tolerance.
Light Crude Crude oil with a high API gravity due to the presence of a high proportion of
light hydrocarbon fractions.
Light Ends The portion of a liquid hydrocarbon mixture having the lowest boiling points
which are easily evaporated.
Light Hydrocarbons The low molecular weight hydrocarbons such as methane, ethane, propane
and butanes. More Volatile.
Linearity The maximum deviation of the calibration curve from a straight line between
zero and full scale, expressed as a percent of full scale output and measured
on increasing measurement only.
Liquefiable Hydrocarbons The components of natural gas that may be recovered as liquid products.
Liquefied Natural Gas Natural gas which has been liquefied by reducing its temperature to minus 260
degrees Fahrenheit at atmospheric pressure. It remains a liquid at -116
degrees Fahrenheit and 673 psig. In volume, it occupies 1/600 of that of the
vapor at standard conditions. Natural gasoline and liquefied petroleum gases
fall in this category.
Liquefied Petroleum Gas A gas containing certain specific hydrocarbons which are gaseous under
normal atmospheric conditions, but can be liquefied under moderate pressure
at normal temperatures. Propane and butane are the principal examples.
Liquid Crystal Display A reflective display that requires very low power for operation.
LNG See Liquefied Natural Gas.
Load (electrical) A load is an energy consuming device. The device can be an actual device
such as a bulb of a flash light, radio, cassette player, motor, etc., a resistor or a
constant current load.