TotalFlow XRC6490, Руководство пользователя

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B-33
TERM DEFINITION
Nm Abbreviation for Newton Meter. Metric Torque measurement.
NO See Normally Open.
Noise An undesirable electrical signal. Noise comes from external sources such as
the AC power line, motors, generators, transformers, fluorescent lights,
soldering irons, CRT displays, computers, electrical storms, welders, radio
transmitters, and internal sources such as semiconductors, resistors, and
capacitors. Unwanted disturbances superimposed upon a useful signal that
tends to obscure its information content.
Nonane (C9H20) A hydrocarbon (Alkane) flammable colorless liquid with nine carbon atoms.
Non-hazardous area Area in which an explosive gas atmosphere is not expected to be present in
quantities such as to require special precautions.
Non-Persistent Refers to data that is no longer available after a Warm Start.
Normal Butane An aliphatic compound of the paraffin series having the chemical formula of
C4H10 and having all of its carbon atoms joined in a straight chain.
Normal Pentane A hydrocarbon of the paraffin series having a chemical formula of C5H12 and
having all its carbon atoms joined in a straight chain.
Normally Closed Designation which states that the contacts of a switch or relay are closed or
connected when at rest. When activated, the contacts open or separated.
Normally Open
Designation which states that the contacts of a switch or relay are normally
open or not connected. When activated the contacts close or become
connected.
Norsok Norwegian Certification Bureau
NPN Negative-Positive-Negative (Transistor).
NPT National Pipe Thread.
NRTL Nationally Recognized Testing Laboratory.
Null A condition, such as balance, which results in a minimum absolute value of
output.
NX-19 American Gas Association Report referring to a specific method to calculate the
Supercompressibility factor.
O2 A standard abbreviation for oxygen.
Octane (C8H18) A hydrocarbon (Alkane) flammable colorless liquid with eight carbon atoms. Is
the 100 point on the Octane Rating Scale.
OCV See Open Circuit Voltage.
ODBC See Open Database Connectivity.
OEU Optional Equipment Unit.
Offset The difference in temperature between the set point and the actual process
temperature. Also, referred to as droop.
OHM The unit of resistance usually shown as the symbol "R". One thousand ohms is
written "k" and one million ohms is written "M". Resistance is measured with a
multimeter, set to the "ohms range".
Ohmeter An instrument used to measure electrical resistance.
OLE Object Linking and Embedding. A set of system services that provides a means
for applications to interact and interoperate. Based on the underlying
Component Object Model, OLE is object-enabling system software. Through
OLE Automation, an application can dynamically identify and use the services
of other applications, to build powerful solutions using packaged software. OLE
also makes it possible to create compound documents consisting of multiple
sources of information from different applications.