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SLN 700 SmartLine NCR Level Transmitter User’s Manual
Revision 1
Glossary
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.
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 stat
us can be configured to set the analog output to ≤ 3.6mA
(downscale) or ≥ 21.0mA (upscale).
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.
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.
Device Type Manager (DTM):
A Device Type Manager is part of the Field Device Tool
(FDT) standard, and is a software component for a device that contains the device-specific
data, functions and logic elements.
Dielectric constant (D
k
):
The ratio of the conductivity of a material to that of a vacuum. In
level measurement, a high Dk indicates a non-conductive or insulating material
