ABB Totalflow NGC8206 Manual Del Usuario página 294

TERM
Pressure, Absolute
Pressure, Atmospheric
Pressure, Gas
Pressure, Gauge
Primary Cell (or Battery)
PRM
Probe
Process Gas
Program
Programmable Logic
Controller
Programmable Read
Only Memory
Programmed I/O
PROM
Propane (C3H8)
Proportional, Integral,
Derivative
Propylene (C3H6)
Página B–48
See PSIA.
See Atmospheric Pressure.
In the natural gas industry pressure is measured by the force applied to
a designated area. PSI and OSI refer to how much pressure (pound or
ounce) is applied to one square inch. Inches Water Column (In.W.C.) is
also used to express gas pressure and is measured using a manometer
for lower pressure readings. 1 PSIG=27.21 Inches Water Column.
See PSIG.
A cell or battery which is not intended to be recharged and is discarded
when the cell or battery has delivered all its electrical energy.
Acronym for Pressure Regulator Module.
A generic term that is used to describe many types of temperature
sensors.
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.
DEFINITION
2103650-001 – rev. AB