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T
Tertiary Variable (TV): A tertiary dynamic feature of the process which may change
rapidly and is measured. (HART only)
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.
U
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 (HART
only).
Revision 2
SLN 700 SmartLine NCR Level Transmitter User's Manual
Page 47
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