ABB Totalflow NGC8206 Manuel D'utilisation page 290

Process Gas
Program
Programmable Logic
Controller
Programmable Read
Only Memory
Programmed I/O
PROM
Propane (C3H8)
Proportional, Integral,
Derivative
Propylene (C3H6)
Protocol
PSI
PSIA
PSID
PSIG
PSIS
PTB
PTC
Page B–46
Gas use for which alternate fuels are not technically feasible, such as in
applications requiring precise temperature controls and precise flame
characteristics.
A list of instructions that a computer follows to perform a task.
A highly reliable special-purpose computer used in industrial monitoring
and control applications. PLCs typically have proprietary programming
and networking protocols, and special-purpose digital and analog I/O
ports.
Computer memory in which data can be written to. ROM is used for
storing programs (e.g. operating systems) and characteristic files on a
permanent basis. (non-volatile)
The standard method a CPU uses to access an I/O device-- each byte
of data is read or written by the CPU.
See Programmable Read Only Memory
A saturated hydrocarbon (Alkane) gas, the molecule of which is
composed of three carbon and eight hydrogen atoms. Propane is
present in most natural gas and is the first product refined from crude
petroleum. It has many industrial uses and may be used for heating
and lighting. Contains approximately 2,500 Btu per cubic foot.
PID Controllers are designed to eliminate the need for continuous
operator attention. An example would be the cruise control in a car or a
house thermostat. These controllers are used to automatically adjust
some variable to hold the measurement (or process variable) at the set-
point. The set-point is where you would like the measurement to be.
Error is defined as the difference between set-point and measurement.
A saturated hydrocarbon (Alkane) gas, the molecule of which is
composed of three carbon and six hydrogen atoms. At room
temperature and pressure, propylene is a gas. It is colorless, highly
flammable, and has a odor similar to garlic. It is found in coal gas and
can be synthesized by cracking petroleum. The main use of propylene
is as a monomer, mostly for the production of polypropylene.
A formal set of conventions governing the formatting and relative timing
of message exchange between two communicating systems.
Pounds per Square Inch.
Pounds per Square Inch Absolute. Absolute pressure uses a perfect
vacuum as the zero point. A perfect vacuum is 0 PSIA.
PSIA=PSIG + Atmospheric Pressure.
Pounds per square inch differential. Pressure difference between two
points.
Pounds per Square Inch Gauge. Gauge pressure uses the actual
atmospheric pressure as the zero point.
Pounds per square inch standard. Pressure referenced to a standard
atmosphere.
Physikalisch Technische Bundesanstalt (Federal Physical Technical
Office) or Technical Institute for Certification.
See Positive Temperature Co-efficient Fuse.
2103971-001 – rev. AB