Instruction Manual
D102748X012
DlC3010 Digital Level Controller
Glossary
May 2018
114
Process Variable (PV)
A physical quality or quantity which is monitored
as part of a control strategy. The digital level
controller can measure liquid level, interface level
between two liquids of different specific gravity,
or liquid density.
Protocol
A set of data formats and transmission rules for
communication between electronic devices.
Devices that conform to the same protocol can
communicate accurately.
Random Access Memory (RAM)
A type of semiconductor memory that is normally
used by the microprocessor during normal
operation that permits rapid retrieval and storage
of programs and data. See also Read Only
Memory (ROM) and Non‐Volatile Memory (NVM).
Read‐Only Memory (ROM)
A memory in which information is stored at the
time of instrument manufacture. You can
examine but not change ROM contents.
Reranging
Configuration function that changes the digital
level controller 4 to 20 mA settings.
RTD
The abbreviation for resistance temperature
detector. Temperature is measured by the RTD by
correlating the resistance of the RTD element
with temperature.
Send Data
A Field Communicator command that transfers
configuration data from the Field
Communicator's working register to the digital
level controller memory.
SI Units
The International System of Units. Includes
metric units such as ampere (A), meter (m),
kilogram (kg), Kelvin (K), and second (s).
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.
Span
Algebraic difference between the upper and
lower range values.
Tag
An eight‐character field for identifying the digital
level controller. The HART tag is stored in the
instrument and can be changed using a Field
Communicator under the Device Identification
menu.
Temperature Sensor
A device within the instrument that measures the
instrument's internal temperature.
Universal Revision
Revision number of the HART Universal
Commands which are the communications
protocol for the instrument.
Upper Range Value (URV)
The value of the process variable that the digital
level controller is currently configured to map to
the 20 mA endpoint in the 4 to 20 mA loop.
Upper Sensor Limit (USL)
Highest value of the process variable that the
digital level controller can assign to a range value.
Computation of an actual sensor limit for this
device would require a complex dynamic
algorithm dependent on much of the
configuration data, process temperature, and
other factors not currently available to the
firmware.
Working Register
Memory location in a Field Communicator that
temporarily stores data as it is being entered.
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