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A
Accuracy: The closeness of the agreement between the result of the measurement
and the true value of the quantity. Accuracy should not be confused with precision
which relates to agreement between subsequent measurements. The quoted
accuracy depends on the initial characterization, the reproducibility of the standard,
and the stability of the measurement between calibrations. The actual accuracy also
depends on the equipment performing and being operated to specification.
Application and Validation Tool (AVT): The online tool which allows users to input
technical data about a specific process tank and to validate that the correct level
transmitter application is delivered to the site ready to install.
ATEX Directive: Consists of two European Union directives which describe the
acceptable equipment and work environment permitted in an environment with an
explosive atmosphere.
B
Blocking Distance: A zone where measurements are not performed.
Burnout: Transmitter burnout status indicates a critical sensor failure has occurred.
In a HART transmitter, burnout status can be configured to set the analog output to ≤
3.6mA (downscale) or ≥ 21.0mA (upscale).
C
Canadian Standards Association (CSA): A not-for-profit standards organization
which develops standards. The CSA registered mark shows that a product has been
independently tested and certified to meet recognized standards for safety or
performance.
Cyclic Redundancy Check (CRC): An error-detecting code commonly used in digital
networks and storage devices to detect accidental changes to raw data.
D
Damping: Applies digital filtering to suppress noise effects on the PV. The range is
from 0.0 to 60.0 seconds.
Digital to Analog Convertor (DAC): A function that converts digital data (usually
binary) into an analog signal (current, voltage).
Device Description (DD): Files describing the configuration of a transmitter for use
by handheld or PC applications.
Revision 2
Glossary
SLN 700 SmartLine NCR Level Transmitter User's Manual
Page 43
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