EMERSON DLC3010 Fisher Fieldvue Digital Level Controller User Guide

EMERSON DLC3010 Fisher Fieldvue Digital Level Controller User Guide

Description

DLC3010 Digital Level Controllers

DLC3010 digital level controllers (figure 1‐1) are used with level sensors to measure liquid level, the level of interface between two liquids, or liquid specific gravity (density). Changes in level or specific gravity exert a buoyant force on a D102748X012 DLC3010 Digital Level Controller Introduction and Specifications August 2020 4 displacer, which rotates the torque tube shaft. This rotary motion is applied to the digital level controller, transformed to an electrical signal and digitized. The digital signal is compensated and processed per user configuration requirements, and converted back to a 4‐20 mA analog electrical signal. The resulting current output signal is sent to an indicating or final control element.

DLC3010 digital level controllers are communicating, microprocessor‐based level, interface, or density sensing instruments. In addition to the normal function of providing a 4‐20 milliampere current signal, DLC3010 digital level controllers, using the HART communications protocol, give easy access to information critical to process operation. You can gain information from the process, the instrument, or the sensor using a Field Communicator with device descriptions (DDs) compatible with DLC3010 digital level controllers. The Field Communicator may be connected at the digital level controller or at a field junction box. Using the Field Communicator, you can perform several operations with the DLC3010 digital level controller. You can interrogate, configure, calibrate, or test the digital level controller. Using the HART protocol, information from the field can be integrated into control systems or be received on a single loop basis. DLC3010 digital level controllers are designed to directly replace standard pneumatic and electro‐pneumatic level transmitters. DLC3010 digital level controllers mount on a wide variety of caged and cageless 249 level sensors. They mount on other manufacturers' displacer type level sensors through the use of mounting adaptors. 249 Caged Sensors (see table 1‐6) 249, 249B, 249BF, 249C, 249K, and 249L sensors side‐mount on the vessel with the displacer mounted inside a cage outside the vessel. (The 249BF caged sensor is available only in Europe, Middle East, and Africa.) 249 Cageless Sensors (see table 1‐7) 249BP, 249CP, and 249P sensors top‐mount on the vessel with the displacer hanging down into the vessel. 249VS sensor side‐mounts on the vessel with the displacer hanging out into the vessel. 249W wafer‐style sensor mounts on top of a vessel or on a customer‐supplied cage.

Specifications

Specifications for the DLC3010 digital level controller are shown in table 1‐1. Specifications for the 249 sensor are shown in table 1‐3.

Specs:

Available

Configurations DLC3010 Digital Level Controller: Mounts on caged and cageless 249 sensors. See tables 1‐6 and 1‐7 and sensor description. Function: Transmitter Communications Protocol: HART

Input Signal 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

Analog: 4‐20 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. Digital: HART 1200 Baud FSK (frequency shift keyed) HART impedance requirements must be met to enable communication. Total shunt impedance across the master device connections (excluding the master and transmitter impedance) must be between 230 and 600 ohms. The transmitter HART receive impedance is defined as:

Rx: 42K ohms and

Cx: 14 nF

Note that in point‐to‐point configuration, analog and digital signalling are available. The instrument may be queried digitally for information, or placed in Burst mode to regularly transmit unsolicited process information digitally. In multi‐drop mode, the output current is fixed at 4 mA, and only digital communication is available

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