TotalFlow XRC6490, Руководство пользователя

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B-35
TERM DEFINITION
Output Noise The RMS, peak-to-peak (as specified) ac component of a transducer's dc
output in the absence of a measurand variation.
P/I See Pulse Input.
Parameter (1) Characteristic. For example, specifying parameters means defining the
characteristics of something. In general, parameters are used to customize a
program. For example, file names, page lengths, and font specifications could
all be considered parameters. (2) In programming, the term
parameter is
synonymous with argument, a value that is passed to a routine.
Parity A technique for testing transmitting data. Typically, a binary digit is added to the
data to make the sum of all the digits of the binary data either always even
(even parity) or always odd (odd parity).
Parts per Million Acronym PPM.
Passive Analog Output Analog Output to a host that is powered by an outside source.
PCCU Portable Collection and Calibration Unit.
PCCU32 Windows version of PCCU communications software to process, archive and
collect data from the Totalflow equipment. Generally run from a laptop.
Peak Area The retention time the element takes to exit the column. This is used in
calculating the amount of each component in the sample or Mole %.
Pentane (C5H12)
A saturated hydrocarbon (Alkane) with five carbon atoms in it’s molecule
(C5H12). A liquid under normal conditions.
Pentane, Normal See Normal Pentane.
Pentanes Plus A hydrocarbon mixture consisting mostly of normal pentane and heavier
components.
Peripheral The input/output and data storage devices attached to a computer such as disk
drives, printers, keyboards, displays, data acquisition systems, etc.
Persistent Refers to data that remains available after a Warm Start.
PEX A flexible material used for LevelMaster sensors.
PGC Process Gas Chromatograph
Phase A time based relationship between a periodic function and a reference. In
electricity, it is expressed in angular degrees to describe the voltage or current
relationship of two alternating waveforms.
Phenol Hydrocarbon derivative containing an [OH] group bound to an aromatic ring.
Physical Change
A change in which a substance changes from one physical state to another but
no substances with different composition are formed. Example Gas to Liquid -
Solid.
PID Proportional, Integral, Derivative. A three mode control action where the
controller has time proportioning, integral (auto reset) and derivative rate action.
Piezoceramic A ceramic material that has piezoelectric properties similar to those of some
natural crystals.
Pipeline Condensate
Liquid hydrocarbons that have condensed from gas to liquid as a result of
changes in pressure and temperature as gas flows in a pipeline. Pipeline
condensate only remains as a liquid under high-pressure conditions and would
vaporize at atmospheric pressure.
Plant Products All liquid hydrocarbons and other products (including sulfur and excluding
residue gas) recovered in a gas processing plant.
PLC See Programmable logic controller
Plunger Lift A technique used to optimize gas production. A Steel plunger is inserted into
the production tubing in the well. The flow is turned off and this shut-in causes
plunger to fall allowing fluid to collect above plunger. Different techniques are
used to decide how long to shut in and flow the well.