Valve Diagnostics

With the DVC7K digital valve controller’s enhanced memory,

it is able to provide a comprehensive library of valve

diagnostic alerts, as shown in Figure 3. These diagnostics

and recommended actions are easily accessed with an

Emerson handheld communicator or from the LUI. When

installed as part of a HART communicating system, the

DVC7K delivers prompt notification of current or potential

equipment issues directly to the asset management system

and supports NAMUR NE107 alert categorization.

Alerts assist in identification and notification of the

following situations:

• Stroke open and/or stroke close degradation

•Valve travel deviation identifies stuck valves that don’t

make full travel

• Cycle count / Travel Accumulator

• Various instrument mechanical and electrical issues

Leverage an Emerson handheld communicator to view the

instrument Event Log which stores alerts in memory on

board the DVC7K, view graphical data, and quickly identify

the stroke open and stroke close times.

Value

• Hardware Savings — When installed in an integrated

control system, significant hardware and installation cost

savings can be achieved. Valve accessories such as limit

switches and position transmitters can be eliminated due

to the integrated position transmitter and switch option.

Solenoid valves can also be eliminated with the On/Off

application mode capabilities

• Increased Uptime — The self‐diagnostic capability

of the DVC7K provides valve performance and health

evaluation without shutting down the process or pulling

the valve assembly from the line.

• Improved Maintenance Decisions — Digital

communication provides easy access to the condition

of the valve. Sound decisions can be made by analysis

of valve information through any HART communicating

asset management software

Ease of Use

• Enhanced Safety — The DVC7K is a HART®

communicating device; information can be accessed

anywhere along the loop. This flexibility can reduce

exposure to hazardous environments and make it easier

to evaluate valves in hard-to-reach locations.

• Local User Interface (LUI) — The full text display in

the local interface is easy to navigate due to the six

button LUI (Figure 2). Each unit can be configured to

display Arabic, Chinese, Czech, English, French, German,

Italian, Japanese, Korean, Polish, Portuguese, Russian or

Spanish. View the Travel vs. Travel Setpoint, Instrument

Mode and Valve Health instantly from the home screen.

• Valve Health — Identify the health status of the valve

assembly at a distance with the NE 107 LED indicator.

Quickly troubleshoot issues and identify recommended

actions with Advice at the Device. Additionally, use the

LUI to view primary variables like supply pressure and

input current.

• Faster Commissioning — HART communications allow

the user to quickly commission loops with a variety

of tools from a remote location or locally at the valve

assembly with the LUI.

• Flexible Connectivity — Emerson’s secure Bluetooth®

wireless technology implementation (future release)

enables ability to see health across multiple valves.

• Easy Maintenance — The DVC7K is modular in design.

Critical working components can be replaced without

removing field wiring or pneumatic tubing.

Features

Reliability

• Linkage‐Less Non‐Contact Position Feedback — The

high performance, linkage-less feedback system, shown

in Figure 1. eliminates physical contact between the valve

stem and the instrument. There is no wearing of parts

so cycle life is maximized. Additionally, the elimination

of levers and linkages reduces the number of mounting

parts and mounting complexity. Instrument replacement

and maintenance is simplified because the feedback

parts stay connected to the actuator stem.

• Built to Survive — The DVC7K’s field-proven conformal

coated electronics resist the effects of vibration,

temperature and corrosive atmospheres per the

ISA.75.13 standard. A weather‐tight housing construction

protects the wiring terminal box and critical components

from harsh environmental conditions.

• Eliminate Solenoids  — DVC7Ks in the On/Off

Application Mode provide a more reliable solution over

traditional solenoid valves. They also provide diagnostic

alerts to support early identification of problems

The FIELDVUE DVC7K digital valve controller is reliable

and intuitive, featuring diagnostics that are targeted for

your On/Off applications. It converts a 4-20 mA or 24 V DC

input signal into a pneumatic output signal that controls

the actuator on the valve. Perform setup and configuration

procedures, check the valve health, and get Advice at the

Device™ using the simple-to-use Local User Interface

(LUI). The interface can be configured to support multiple

languages with a few button pushes.

Performance

• Accurate and Responsive — The two‐stage instrument

design provides quick response. Additionally, the DVC7K

allows users to customize the performance of their valve,

with a configurable ramp open rate and ramp closed rate.