Fisher FIELDVUE DVC6200 Instruction Manual page 107

Seat Load
Force exerted on the valve seat, typically
expressed in pounds force per lineal inch of port
circumference. Seat load is determined by shutoff
requirements.
Set Point Filter Time
The time constant, in seconds, for the first-order
input filter.
Software
Microprocessor or computer programs and
routines that reside in alterable memory (usually
RAM), as opposed to firmware, which consists of
programs and routines that are programmed into
memory (usually ROM) when the instrument is
manufactured. Software can be manipulated
during normal operation, firmware cannot.
Stroking Time
The time, in seconds, required to move the valve
from its fully open position to fully closed, or vice
versa.
Temperature Sensor
A device within the FIELDVUE instrument that
measures the instrument's internal temperature.
Travel
Movement of the valve stem or shaft which
changes the amount the valve is open or closed.
Travel Accumulator
The capability of a FIELDVUE instrument to
record total change in travel. The value of the
Travel Accumulator increments when the
magnitude of the change exceeds the Travel
Accumulator Deadband. To reset the Travel
Accumulator, set it to zero.
Travel Accumulator Alert
Checks the difference between the Travel
Accumulator value and the Travel Accumulator
Alert Point. The Travel Accumulator Alert is active
when the Travel Accumulator value exceeds the
Travel Accumulator Alert Point. It clears after you
reset the Travel Accumulator to a value less than
the alert point.
September 2010
Travel Accumulator Alert Point
An adjustable value which, when exceeded,
activates the Travel Accumulator Alert. Valid
entries are 0% to 4 billion %.
Travel Accumulator Deadband
Region around the travel reference point
established at the last increment of the
accumulator. This region must be exceeded
before a change in travel can be accumulated.
Valid entries are 0% to 100%.
Travel Alert
Checks the ranged travel against the travel high
and low alert points. The travel alert is active if
either the high or low point is exceeded. Once a
high or low point is exceeded, the ranged travel
must clear that point by the Travel Alert
Deadband before the alert clears. Four travel
alerts are available: Travel Alert Hi, Travel Alert
Lo, Travel Alert Hi Hi, and Travel Alert Lo Lo.
Travel Alert Deadband
Travel, in percent of ranged travel, required to
clear a travel alert, once it is active. Valid entries
are −25% to 125%.
Travel Alert High Point
Value of the travel, in percent of ranged travel,
which, when exceeded, sets the Travel Alert Hi
alert. Valid entries are −25% to 125%.
Travel Alert High High Point
Value of the travel, in percent of ranged travel,
which, when exceeded, sets the Travel Alert Hi Hi
alert. Valid entries are −25% to 125%.
Travel Alert Low Point
Value of the travel, in percent of ranged travel,
which, when exceeded, sets the Travel Alert Lo
alert. Valid entries are −25% to 125%.
Travel Alert Low Low Point
Value of the travel, in percent of ranged travel,
which, when exceeded, sets the Travel Alert Lo
Lo alert. Valid entries are −25% to 125%.
Glossary
B
Glossary
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