Instruction Manual
D102748X012
DLC3010 Digital Level Controller
Principle of Operation
May 2018
100
Figure A‐2. Typical Multidropped Network
HOST
BELL 202
MODEM
POWER
SUPPLY
LOAD
The Field Communicator can test, configure, and format a multidropped DLC3010 digital level controller in the same
way as in a standard point‐to‐point installation, provided that it has been configured to scan for multiple polling
addresses.
Note
DLC3010 digital level controllers are set to address 0 at the factory, allowing them to operate in the standard point‐to‐point
manner with a 4-20 mA output signal. To activate multidrop communication, the address must be changed to a number between
1 and 15. This change deactivates the 4-20 mA analog output, sending it to 4 mA. The failure mode current also is disabled.
Digital Level Controller Operation
The DLC3010 digital level controller is a loop‐powered instrument that measure changes in liquid level, level of an
interface between two liquids, or density of a liquid. Changes in the buoyancy of a displacer suspended in a vessel vary
the load on a torque tube. The displacer and torque tube assembly constitute the primary mechanical sensor. The
angular deflection of the torque tube is measured by the instrument transducer, which consists of a magnet system
moving over a Hall effect device. A liquid crystal display (LCD) meter can display the analog output; process variable
(level, interface level, or density); the process temperature, if an RTD (resistance temperature detector) is installed;
the degrees of torque tube rotation; and percent range.
The instrument uses a microcontroller and associated electronic circuitry to measure the process variable, provide a
current output, drive the LCD meter, and provide HART communications capability. Figure A‐3 shows the digital level
controller assembly. Figure A‐4 is a block diagram of the main components in the instrument electronics; the LCD
meter, the processor module, the transducer board, and the terminal board. The processor module contains the
microprocessor, the analog‐to‐digital (A/D) converters, loop interface, signal conditioning, the digital‐to‐analog (D/A)
output, power supply and interfaces to other boards.
Содержание FISHER FIELDVUE DLC3010
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