FIELDVUE DLC3000 Series digital level controllers
(figure 1) are used with level sensors to measure
liquid level, the level of the interface between two
liquids, or liquid specific gravity (density). Changes
in level or specific gravity exert a buoyant force on a
displacer, which rotates a torque tube shaft. The
digital level controller converts this rotational motion

to an electronic signal.

DLC3000 Series digital level controllers are
communicating, microprocessor-based instruments
that can be configured to sense the level, interface
level, or density of liquids. In addition to the normal
function of providing a 4 to 20 milliampere current
signal, DLC3000 Series digital level controllers,
using the HART communications protocol, give
easy access to information critical to process
operation. 

You can obtain information about the
process, instrument, or sensor using the Model 375
Field Communicator. Advanced user-interface
capabilities are enabled by AMS Suite: Intelligent
Device Manager. 

The DLC3000 Series can be used
in analog or HART digital signaling mode with the
Emerson Process Management DeltaV system.
The connection for HART communication may be
made at any point in the field wiring that meets the
HART impedance requirements. Configuration,
calibration, diagnostics, parameter review, signal
monitoring and alert monitoring are all available
through the HART protocol. Information from the
field can be integrated into control systems or be
received on a single loop basis.
DLC3000 Series digital level controllers are
designed to directly replace standard pneumatic and
electronic level transmitters. Type DLC3010 digital
level controllers mount on a wide variety of Fisher
249 Series cageless and caged level sensors.

Available Configurations
Type DLC3010 Digital Level Controller:
Mounts on Fisher 249 Series caged and cageless
sensors. See tables 4 and 5 and sensor
description.
Function: Transmitter
Communications Protocol: HART
Input Signal(1)
Level, Interface, or Density: Rotary motion of
torque tube shaft proportional to changes in liquid
level, interface level, or density that change the
buoyancy of a displacer.
Process Temperature: Interface for 2- or 3-wire
100 ohm platinum RTD for sensing process
temperature, or optional user-entered target
temperature to permit compensating for changes
in specific gravity
Output Signal(1)
Analog: 4 to 20 milliamperes dc ( direct
action—increasing level, interface, or density
increases output; or  reverse action—increasing
level, interface, or density decreases output)
High saturation: 20.5 mA
Low saturation: 3.8 mA
High alarm: 22.5 mA
Low Alarm: 3.7 mA
Only one of the above high/low alarm definitions
is available in a given configuration. NAMUR NE
43 compliant when high alarm level is selected.