Emerson Fisher™ FIELDVUE™ DVC2000 Digital Valve Controller

Instrument Description

The DVC2000 digital valve controller is a communicating, microprocessor-based

current-to-pneumatic valve positioner. It is designed to replace standard pneumatic and

electro-pneumatic valve positioners.

In addition to the traditional function of converting an input current signal (4 to 20 mA) to a

pneumatic output pressure, the DVC2000 digital valve controller communicates via a local

display panel and/or via the HART® protocol. An option is available which provides isolated

circuitry for two (2) integrated limit switches (for open/close valve indication) and a valve

position transmitter (for separate valve position feedback).

Terminology

Instrument Level – There are four (4) levels of functionality available: AC, HC, AD and PD.

AC – This level provides the capability to setup and calibrate the positioner through the local

user interface or a handheld communicator.

HC – This level provides additional capability for advanced configuration of the positioner

(such as travel limits/cutoffs, custom characterization and minimum open/closing time).

Also, information is available through the HART protocol for diagnostic alerts such as travel

deviation, cycle count and travel accumulation.

AD – This level provides advanced diagnostic capabilities for performance testing. When used

with ValveLink software, instrument health can be evaluated with tests such as Valve Signature,

step response and dynamic error band. The software program provides detailed analysis

with graphics.

PD – This level provides automated, non-intrusive testing of the operating performance of

the control valve assembly. When used with ValveLink software, tests to isolate component

degradation can be run on the valve assembly without affecting the process.

Local Interface – The DVC2000 comes standard with a Liquid Crystal Display (LCD) and four (4)

pushbuttons. The local interface provides the capability to setup and calibrate the positioner

and view basic diagnostic messages.

Magnet Assembly – This is the feedback component that is mounted directly to the valve stem.

It supplies a magnetic field that is sensed by the digital valve controller.

Options Board – The DVC2000 digital valve controller is available with two (2) limit switches

and a valve position transmitter. The options board includes the additional circuitry and

terminations that are required to support these output signals.

Pole Piece – Inserted into the DVC2000 housing and protruding through the back of the

instrument is a two-pronged fork that houses the magnetic sensor for position feedback.