Glossary
June 2017
Instruction Manual
D103176X012
68
Instrument Protection
Determines if commands from a HART device can
calibrate and/or configure certain parameters in
the instrument. There are two types of
instrument protection:
Configuration and Calibration: Prohibits changing
protected setup parameters; prohibits
calibration.
None: Permits both configuration and calibration.
The instrument is ”unprotected.”
Instrument Serial Number
The serial number assigned to the printed wiring
board by the factory but can be changed during
setup. The instrument serial number should
match the serial number on the instrument
nameplate.
Leak Class
Defines the allowable leakage by a valve when it is
closed. Leak class numbers are listed in two
standards: ANSI/FCI 70‐2‐1991 and IEC 534‐4.
Linear
A valve flow characteristic where changes in flow
rate are directly proportional to changes in valve
stem travel. One of the input characteristics
available for a FIELDVUE Instrument. See also,
Equal Percentage and Quick Opening.
Linearity, dynamic
Linearity (independent) is the maximum
deviation from a straight line best fit to the
opening and closing curves and a line
representing the average value of those curves.
Memory
A type of semiconductor used for storing
programs or data. FIELDVUE instruments use
three types of memory: Random Access Memory
(RAM), Read Only Memory (ROM), and
Non‐Volatile Memory (NVM). See also these
listings in this glossary.
Menu
A list of programs, commands, or other activities
that you select by using the arrow keys to
highlight the item then pressing ENTER, or by
entering the numeric value of the menu item.
Minimum Closing Time
Minimum time, in seconds, for the travel to
decrease through the entire ranged travel. This
rate is applied to any travel decrease. Valid entries
are 0 to 400 seconds. Deactivate by entering a
value of 0 seconds.
Minimum Opening Time
Minimum time, in seconds, for the travel to
increase through the entire ranged travel. This
rate is applied to any travel increase. Because of
friction, actual valve travel may not respond in
exactly the same time frame. Valid entries are 0
to 400 seconds. Deactivate by entering a value of
0 seconds.
Non‐Volatile Memory (NVM)
A type of semiconductor memory that retains its
contents even though power is disconnected.
NVM contents can be changed during
configuration unlike ROM which can be changed
only at time of instrument manufacture. NVM
stores configuration restart data.
Parallel
Simultaneous: said of data transmission on two or
more channels at the same time.
Polling Address
Address of the instrument. If the digital valve
controller is used in a point‐to‐point
configuration, set the polling address to 0. If it is
used in a multidrop configuration, or split range
application, set the polling address to a value
from 0 to 15.
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