Honeywell SLG 700 User Manual page 156

Operating Range: The range of measurement values within which the instrument will
provide a measurement but the error is not well-defined.
PACTWare: A free software application for instruments that are based on FDT technology. It can be
used to load and run a manufacturer's DTM for a specific instrument.
Precision: The closeness of agreement between the results obtained by applying a measurement
procedure several times on identical materials and under prescribed measurement conditions. The
smaller the random part of experimental error, the more precise the measurement procedure.
Printed Wiring Assembly (PWA): Also known as a printed circuit assembly. It is a populated
electronics board.
Process Variable (PV): A dynamic feature of the process which may change rapidly and is
measured. The PV is the only dynamic variable sent via analog signal to the control system.
Quaternary Variable (QV): The fourth dynamic feature of the process which may change rapidly
and is measured.
Random Access Memory (RAM): A type of computer data storage. Data is accessed randomly
where any byte of memory can be accessed without touching the preceding byte.
Reproducibility: The closeness of agreement between independent results obtained in the normal
and correct operation of the same method on identical test material, in a short space of time, and
under the same test conditions (such as the same operator, same apparatus, same laboratory).
Safe Failure Fraction (SFF): The fraction of the overall failure rate of a device that results in either
a safe fault or a diagnosed unsafe fault.
Safety Instrumented Function (SIF): A set of equipment intended to reduce the risk due to a
specific hazard (a safety loop).
Safety Integrity Level (SIL): A discrete level (one out of a possible four) for specifying the safety
integrity requirements of the safety functions to be allocated to the E/E/PE safety-related systems
where Safety Integrity Level 4 has the highest level of safety integrity and Safety Integrity Level 1
has the lowest.
Safety Instrumented System (SIS): The implementation of one or more Safety Instrumented
Functions and is composed of any combination of sensor(s), logic solver(s), and final element(s).
Secondary Variable (SV): A secondary dynamic feature of the process which may change rapidly
and is measured.
Stillwell / Stilling well: A chamber that enables level measurement in turbulent conditions.
Tertiary Variable (TV): A tertiary dynamic feature of the process which may change rapidly and is
measured.
Time-Domain Reflectometry (TDR): For Level measurement, it is a measurement technique used
to determine distance by measuring the time it takes to send electromagnetic measurement pulses
along a probe (for example, a metallic probe), reflect off a surface (liquid or solid) and travel back to
the source.
Upper Product: The lighter liquid when two liquids exist in a vessel (e.g. oil in an oil/water
measurement application)
Upper Range Value (URV): A Basic configuration parameter which allows users to enter the
measuring value for which the analog output will be scaled to 20 mA.
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SLG 700 SmartLine Level Transmitter User's Manual
Revision 7