FIELDVUE® Digital Level Instruments

 FIELDVUE DLC3000 Series digital level controllers are loop-powered instruments. Inconjunction with a 249 Series sensor, they measure changes in liquid level, the level of an interface between two liquids, or liquid specific gravity (density). A level, density, or interface level change in the measured fluid causes a change in the displacer position.

This change is transferred to the torque tube assembly and to the digital level controller lever assembly. The rotary motion moves a magnet attached to the lever assembly, changing the magnetic field that is sensed by the Hall-effect sensor. The sensor converts the magnetic field signal to a varying electronic signal, which is converted to a 4 to 20 mA output signal.

Standard or Custom Configuration... With the integration of a wafer-style liquid level sensor and transmitter into one product, the Type DL3 (DLC3000 Series digital level controller in combination with a 249W Series sensor) enables users to install digital level transmitters to a variety of industry standard or custom process vessel connections. The sensor consists of a wafer body, torque tube assembly and displacer and is available in Class 150, 300, and 600. The wafer body mounts between 3- or 4-inch raised face flanges. Custom configurations are also available to meet your specific application requirements. Refer to the DLC3000 Series specifications in tables 1, 2, and 10, and the 249 Series specifications in tables 6, 7, 8, 9, and 10 for complete product line capabilities and options.

HART/AMS Compliant... The DLC3000 uses HART protocol to interface with the Model 375 Field Communicator (see figure 2) for field interface operations. Advanced user-interface capabilities are enabled by AMS Suite: Intelligent Device Manager

Simplified Setup and Calibration... With the electronic Setup Wizard, digital level controller startup is straightforward and fast. Level and temperature alarms, specific gravity tables, calibration trim, and trending are readily configurable. DLC3000 Series digital level controllers also support re-ranging without a fluid reference.

Responsive to Small Process Change... Accurate, high-gain analog-to-digital conversion enables measurement of small changes in the process variable. In addition, an input filter and output damping may be adjusted by the user to attenuate noise from mechanical disturbance or liquid turbulence at the displacer.

Easy Maintenance... Field wiring connections are in a compartment separated from the electronics. This helps to protect the electronics from any moisture brought into the housing by the field wiring. This also eases installation and maintenance. The digital level controller does not have to be removed to facilitate troubleshooting or service. However, if it is necessary to remove the digital level controller for in-shop maintenance and calibration, field wiring does not need to be disconnected.