Fisher IM Supplement: Safety manual for Fisher FIELDVUE DVC6200 Digital Valve Controller and Position Monitor Manuals & Guides

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Instruction Manual Supplement

D104564X012

DVC6200 Digital Valve Controller

September 2020

Safety manual for Fisher™ FIELDVUE™ DVC6200 Digital Valve Controller and Position Monitor

This supplement applies to

Instrument Level HC, AD, PD, ODV Device Type 1309 Hardware Revision 2 Firmware Revision 7 Device Revision 103 DD Revision 701

1. Purpose

This safety manual provides information necessary to design, install, verify and maintain a Safety Instrumented Function (SIF) utilizing the Fisher DVC6200 digital valve controller. This document must be thoroughly reviewed and implemented as part of the safety lifecycle. This information is necessary for meeting the IEC 61508 or IEC 61511 functional safety standards.

WARNING

This instruction manual supplement is not intended to be used as a stand-alone document. It must be used in conjunction with the following documents: Fisher DVC6200 Series Quick Start Guide (D103556X012 Fisher DVC6200 Instruction Manual (D103605X012

Failure to use this instruction manual supplement in conjunction with the above referenced documents could result in personal injury or property damage. If you have any questions regarding these instructions or need assistance in obtaining any of these documents, contact your Emerson sales office

)

www.Fisher.com

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2. Description of the Device

The Fisher DVC6200 digital valve controller is an instrument which delivers controlled pneumatic pressure to modulate a valve actuator in response to an electrical signal. An optional valve position monitor will either transmit a 420 mA signal in response to the actual valve travel or open and close a discrete limit switch based on a configurable trip point.

This safety manual applies to the DVC6200 instrument with electronics hardware revision 2 (HW2) and firmware revision 4, 5, 6, and 7 with the following product options.

OPTION

MODEL CONSTRUCTION

DVC6200 Integral, Aluminum n n n n n n

DVC6200S

DVC6205 SIS DVC6215

Integral, Stainless Steel

Remote Mount, Aluminum

DETT 0-20 mA 24 VDC Relay A Relay C

n n n n n n

Position Monitor

APPLICATION

DETT n n n n n n 0-20 mA n n n n n 24 VDC n n n n n

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3. Terms, Abbreviations, and Acronyms

Beta factor for common cause effects of failure

DETT Deenergize to Tri

DTM

DVC6200 Digital Valve Controller, product model designation ESD Emergency Shut Down FIT Failure In Time (1x10 FMEDA Failure Mode Effect and Diagnostic Analysis

HART

HFT Hardware Fault Tolerance

Low Demand Mode

Multidrop

PFD

PointtoPoint Operating mode of the DVC6200 whereby the instrument is powered with 420 mA. PVST Partial Valve Stroke Test

Relay A

Relay C

Safet Safety Function SFF Safe Failure Fraction SIF Safety Instrumented Function SIL Safety Integrity Level SIS Safety Instrumented System SOV Solenoid Operated Valve Type A Element Type B Element

Device Description, an electronic data file that describes specific features and functions of a device to be used b

host applications.

Device driver that provides a unified structure for accessing device parameters, configuring and o

erating the devices and diagnosing problems.



failures per hour

Highway Addressable Remote Transducer, open protocol for digital communication su

erimposed over a direct current.

Failure rate. λDD: dangerous detected; λDU: dangerous undetected; λSD: safe detected; λSU: safe undetected. Mode of operation of a safety instrumented function where the demand interval is greater than twice the

roof test interval. Operating mode of the DVC6200 where the instrument controls the current drawn to enable it to be

owered with 24 VDC.

Average Probability of Failure on Demand

Pneumatic booster relay for double- or single-acting applications. Typical construction for double-actin

DETT applications. Pneumatic booster relay for single-acting direct applications. Typical construction for sin

le-acting DETT applications. Freedom from unacceptable risk of harm. Function of a device or combination of devices intended to be used within a Safety Instrumented S

stem to reduce the probability of a specific hazardous event to an acceptable level.

“NonComplex” element (using discrete components); for details see 7.4.4.1.2 of IEC 615082.

“Complex” element (using complex components such as micro controllers or programmable lo

; for details see 7.4.4.1.3 of IEC 615082.

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4. Related Literature

D Fisher DVC6200 Series Quick Start Guide (D103556X012)

Instruction Manual Supplement

D104564X012

D Fisher DVC6200 Instruction Manual (D103605X012

D 62.1:DVC6200, Fisher DVC6200 Product Bulletin (D103415X012

D 62.1:DVC6200 HC, Fisher DVC6200 Product Bulletin (D103423X012

D HART Field Device Specification for Fisher DVC6200 (D103639X012

)

D IEC 61508: 2010 Functional safety of electrical/electronic/programmable electronic

safetyrelated systems

D ANSI/ISA 84.00.012004 (IEC 61511 Mod.) Functional Safety – Safety Instrumented Systems for

the Process Industry Sector

D Exida FMEDA Report for Fisher DVC6200, Position Monitor Applications 

Report No. EFC 12/02027 R001

D Exida FMEDA Report for Fisher DVC6200, DETT Applications

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5. General Requirements

WARNING

To ensure safe and proper functioning of equipment, users of this document must carefully read all instructions, warnings, and cautions in this safety manual and the Quick Start Guide.

D Refer to the Fisher DVC6200 Quick Start Guide (D103556X012) for mounting and

configuration.

D Tools needed:

D DVC6200

D Flat Head Screwdriver, 3 mm Thin Blade (wiring terminations)

D Phillips Screwdriver

September 2020

D 3/8” Hex Key (terminal box conduit plug)

D 6 mm Hex Key (module base screws)

D 5 mm Hex Key (terminal box screw)

D 2.5 mm Hex Key (I/P converter screws)

D 1.5 mm Hex Key (terminal box cover screw)

D Personnel performing maintenance and testing on the DVC6200 shall be competent to do so.

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6. Safety Instrumented System Design

When using the DVC6200 digital valve controller in a safety instrumented system, the following items must be reviewed and considered.

6.1 SIL Capability

6.2 Safety Function

6.3 Failure Rates

6.4 Application Limits

6.5 Environmental Limits

6.6 Application of the Switch Output for Diagnostic Annunciation

6.1. SIL Capability

D Systematic Integrity

SIL 3 Capable— the digital valve controller has met manufacturer design process requirements of IEC 61508 Safety Integrity Level 3.

D Random Integrity

D The digital valve controller is classified as a Type A device according to IEC 61508. The

complete final element subsystem will need to be evaluated to determine the SFF. If the SFF of the subsystem is >90%, and the PFD

< 103, the design can meet SIL 3 @ HFT=0.

avg

D The position monitor is classified as a Type B device according to IEC 61508. The

complete final element subsystem will need to be evaluated to determine the SFF. If the SFF of the subsystem is >90%, and the PFD If the SFF of the subsystem is between 60% and 90%, and the PFD

< 102, the design can meet SIL 2 @ HFT=0.

avg

< 101, the design

avg

can meet SIL 1 @ HFT=0.

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6.2. Safety Function

D Deenergize to Trip Application: The application of the digital valve controller is limited to low

demand mode. Table 1 describes the normal and safe states of DVC6200 for a DETT configuration. The digital valve controller may be operated with one of the following control signals:

D 024 VDC: Normal operation is with a 24 VDC signal applied to the digital valve

controller. A shutdown command is issued by interrupting the loop or taking the voltage signal to 1 VDC or less.

D 020 mA: Normal operation is active throttling control with 4-20 mA current loop signal

to the digital valve controller. A shutdown command is issued by taking the current signal to 0 mA (nominal).

Table 1. Normal and Safe States for De-Energize to Trip (DETT) Application

Action Relay

Single C or A

Double A

Input Voltage or

Current

0 VDC or 0 mA Port A < 1 psi

24 VDC or 20 mA

0 VDC or 0 mA

24 VDC or 20 mA

Normal State Safe State

Port A

≥ 95% of Supply

Port A pressure

≤ Port B pressure

Port A ≥ 95% of Supply

Port B < 1 psi

D Position Monitor Application: The safety function of the position transmitter output is to

transmit a 420 mA analog signal that represents valve position. The safety function of the limit switch output is to transmit a discrete signal that represents a user configurable threshold of valve position. Table 2 describes the normal and alarm states of the Position Monitor function of the DVC6200.

Table 2. Normal and Alarm States for the Position Monitor Application

Output Function Normal State Accuracy Alarm State

420 mA

Position Transmitter

0/1A

Limit Switch

1. Configurable high or low. Values are per NAMUR NE43. Fail high when the instrument is powered.

2. On loss of loop circuit power, the limit switch will go to the open state.

Actual Valve Position 5%

CLOSED 5% OPEN

>22.5 mA or

<3.6 mA

(1)

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6.3. Failure Rates

The failure rate data listed in tables 3, 4, and 5 is only valid for the 15year useful lifetime of the DVC6200 digital valve controller. The failure rates will increase after this time period. Reliability calculations based on the data listed in the FMEDA report for mission times beyond the useful lifetime may yield results that are too optimistic, i.e. the calculated Safety Integrity Level will not be achieved.

Table 3. Failure Rates for DVC6200 with 024 VDC or 020 mA Control Signal, DETT

Failure Category

w/Diagnostics Normal

Fail Safe Detected 182 0 Fail Safe Undetected 264 446 Fail Dangerous Detected 77 0 Fail Dangerous Undetected 48 125 No Effect 942 1,520 Annunciation Failure Detected 398 0 Annunciation Failure Undetected 177 0

Failure Rate (in FIT)

Table 4. Failure Rates for DVC6200 Position Monitor

Failure Rate (in FIT)

Failure Category

End Mounted Rotary LinkageLess,

NonContact Feedback

Position Transmitter or Limit Switch

All Other Mountings

Fail Safe Undetected 30 92 Fail Dangerous Detected Fail Detected (detected by internal diagnostics) Fail High (detected by logic solver) Fail Low (detected by logic solver)

160 203

30 30

141 141 Fail Dangerous Undetected 31 96 No Effect 167 258 Annunciation Failure Undetected 5 5

1. If the system is not able to detect any or all of these failure categories, the corresponding Failure Rate(s) must be applied to the Fail Dangerous Undetected category.

Table 5. Failure Rates According to IEC 61508 in FIT

Application Device l

DeEnergize to Trip

With Diagnostics 580 264 77 48 - 62%

Normal 0 446 0 125 - -

End Mounted Rotary

Position Monitor

LinkageLess, NonContact

0 30 331 31 92.2% 91%

Feedback

All Other Mountings 0 92 374 96 82.9% 80%

1. The No Effect failures are no longer included in the Safe Undetected failure category according to IEC 61508, ed2, 2010.

2. Safe Failure Fraction needs to be calculated on (sub)system level.

3. Diagnostic coverage (DC) is λ

/ ( λ

DD + λDU

SFF

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6.4. Application Limits

D Safety Instrumented Function design verification must be done for the entire collection of

equipment used in the Safety Instrumented Function including the DVC6200 digital valve controller. The SIS must fulfill the requirements according to the Safety Integrity Level, especially the limitation of average Probability of Failure on Demand (PFDavg)

D The system’s response time is dependent on the entire final element subsystem. The user

must verify the system response time is less than the process safety time for each final element.

D The DVC6200 needs to be in active throttling control.

D The DVC6200 digital valve controller has a fault reaction time of 30 seconds plus alert

annunciation time plus the mean time to repair.

D The DVC6200 position monitor safety function has a fault reaction time of 30 seconds plus

the mean time to repair.

D The position monitor with the remote mount construction is not safety certified.

D The valve actuation means must be of a type that automatically moves the valve to the safe

state when the digital valve controller achieves the safe state. Valve stroke timing under these conditions may also need to be considered as part of the SIS design.

D When using the DVC6200 in redundant applications, the owneroperator of the facility

should institute common cause training and more detailed maintenance procedures specifically oriented toward common cause defense.

D An estimate for the common cause failure rate (b) as determined for the DVC6200 used in a

redundant configuration is 2% for DETT applications and 5% for Position Monitor applications.

D The digital valve controller safety function is intended for use in an independent SIF loop from

the position transmitter or limit switch application. Common cause failures between the digital valve controller and position monitor were not considered as a part of the FMEDA analysis.

D The supply pressure must not exceed 145 psig. The supply medium may be air or natural gas.

Air: Supply pressure must be clean, dry air that meets the requirements of ISA Standard

7.0.01. Natural Gas: Natural Gas must be clean, dry, oilfree and noncorrosive. A maximum 40 micrometer particle size in the air system is acceptable. Further filtration

down to 5 micrometer particle size is recommended.

D Diagnostic annunciation is dependent on a HART communicating host device being

connected to the DVC6200 and being able to annunciate any problems encountered including the absence of a valid response from the DVC6200.

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6.5. Environmental Limits

D Operating ambient temperature, refer to:

Instruction Manual Supplement

D104564X012

D DVC6200 Instruction Manual (D103605X012

)

D Humidity: tested per IEC 61514-2

D Electromagnetic Compatibility:

D EN 61326‐1:2013 Electrical equipment for measurement, control and laboratory use -

EMC requirements - General requirements

D Immunity ‐ Industrial locations per Table 2 of EN 61326-1

D Emission – Class A, Group 1 per Table 4 of CISPR 11

D To achieve the compatibility, the following installation practices shall be followed

D Metal conduit shall be used to shield the AUX cable between DVC6200. Ensure that

the metal conduit has good contact with the enclosure of each equipment.

D The DVC6200 enclosure shall be grounded locally.

D Vibration: tested per ANSI/ISA S75.13.01 Section 5.3.5. If excessive vibration can be

expected, special precautions shall be taken which may include, but are not limited to:

D Ensuring the integrity of the instrument mounting to the actuator.

D Ensuring the integrity of pneumatic connections.

D Remote mounting the DVC6200 on a pipestand or wall.

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6.6. Application of the Switch Output for Diagnostic Annunciation

When using the Failure Rates “with diagnostics”, the system must be capable of monitoring the DVC6200 for alert conditions. To monitor the diagnostic detection, configure the switch output to report an alert condition.

 Make sure that the electronics hardware is configured for the switch output.

See figure 1.

 Configure the switch to close on detection of an alert.

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7. Installation & Commissioning Guidelines

7.1. DVC6200 DETT Safety Function

 Verify that the DVC6200 is suitable for use in this Safety Instrumented Function.

 Verify that nameplate markings of all the equipment being installed are suitable for the

hazardous location (if required).

 Verify appropriate connections to the logic solver are made by referring to the instruction

and safety manual of the logic solver.

 For maximum availability and benefit of digital valve controller features, the unit must be

properly configured and calibrated, the Instrument Mode set to In Service and the protection set to Config & Calib using the Instrument Setup > Change Protection menu. With protection set, calibration and other protected parameters cannot be changed, including the Instrument Mode. Figure 1 below identifies toggle switches on the main electronics board that are configured as determined by the safety function and system application.

Figure 1. Configuration Toggle Switches on the Main Electronics Board

POSITION TRANSMITTER / LIMIT SWITCH OUTPUT

CONTROL SIGNAL CONFIGURATION

0-24 VDC

0-20 mA

POINT-POINT / MULTIDROP SELECTION

Multi

PT-PT

 The safety function of the DVC6200 within the final control element subsystem along with

the overall SIS safety function must be tested after installation to ensure that it meets safety demand and applicable process safety time requirements.

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7.2. Position Monitor Safety Function

Note

The position monitor (transmitter or switch) with the remote mount construction is not safety certified.

 Verify that the DVC6200 with position monitor is suitable for use in this Safety Instrumented

Function.

 Verify that nameplate markings are suitable for the hazardous location (if required).

 Verify appropriate connections to the logic solver are made by referring to the instruction

and safety manual of the logic solver.

 Ensure that the Output toggle switch (shown in figure 1) is set to the Transmitter position or

Switch position, depending on the application.

 Ensure that the device configuration parameter for the function of the output terminal

matches the Output toggle switch setting.

 For maximum availability and benefit of digital valve controller features, the unit must be

properly configured and calibrated, the Instrument Mode set to In Service, and the protection set to Config & Calib using the Instrument Setup > Change Protection menu. With protection set, calibration and other protected parameters cannot be changed, including the Instrument Mode. Figure 1 identifies toggle switches on the main electronics board that are configured as determined by the safety function and system application.

 The sensor safety function of the position monitor along with the overall SIS safety function

must be tested after installation to ensure that it meets safety demand and applicable process safety time requirements.

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8. Operation, Periodic Inspection, Test, and Repair

Periodic testing, consisting of proof tests and active throttling control, is an effective way to reduce the PFD Results of periodic inspections and tests should be recorded and reviewed periodically.

Note

Any time the SIF needs to be disabled, such as to perform a proof test or to take corrective action, appropriate measures must be taken to ensure the safety of the process.

Note

To ensure corrective action, continuous improvement, and accurate reliability prediction, the user must also work with their local Emerson service representative to see that all failures are reported.

of the DVC6200 instrument as well as the valve and actuator it is connected to.

avg

8.1. Test Steps for the DVC6200 and Position Monitor

Proof tests are fullstroke tests that are manually initiated. As part of the test, the capability of the SIF to achieve the defined safe state must be verified. The proof test interval must be established for the SIF based on the failure rates of all the elements within the function and the risk reduction requirements. The proof test interval has to be at least 2 times more frequent than the demand rate. This determination is a critical part of the design of the SIS. A proof test will detect 79% (DETT) of dangerous undetected failures not detected by the DVC6200 automatic diagnostics. A proof test includes the following steps:

 Read the digital valve controller alert record using a HART communicating device such as an

Emerson Field Communicator, ValveLink software or a DD or DTM based host. Any active alert messages must be investigated and resolved.

 Bypass the final control element or take appropriate action to avoid a false trip.

 If used, bypass the safety function of the position monitor or take appropriate action to avoid

a false trip.

 If applying “with diagnostics” failure rates, verify that the Instrument Mode is In Service, the

instrument is in active throttling control, and that the instrument Protection is set to Config & Calib.

 Trip the DVC6200 to its safe state by deenergization (for DETT).

 Observe that the actuator and valve move to its safe state within the required safety time

through an instrument independent means (visual or other).

 If used, observe that the position transmitter reports the actual valve position to within 5%

accuracy throughout the range of travel as required by the application through an instrumentindependent means (visual or other).

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 If used, observe that the limit switch is open through an instrumentindependent means

(visual or other).

 Restore the DVC6200 to its normal state by energization (for DETT).

 Observe that the actuator and valve return to its normal state through an

instrumentindependent means (visual or other).

 If applying “with diagnostics” failure rates and the valve is always at the normal end, ensure

that EPPC is operational by noting that output pressure from the instrument goes to the Pressure Set Point after the Pressure Saturation Time has elapsed (default 45 seconds).

 If used, observe that the position transmitter reports the actual valve position to within 5%

accuracy throughout the range of travel as required by the application through an instrumentindependent means (visual or other).

 If used, observe that the limit switch is closed through an instrumentindependent means

(visual or other).

 Check air filters to ensure they are clean and operating properly.

 Inspect the unit for any loose screws or other incorrect mechanical condition.

 Record the test results and any failures in your company’s SIF inspection database.

 Remove the bypass and restore normal operation.

Instrument alerts considered when using the with diagnostics failure rates are evaluated when the instrument is in service and controlling the process. To take credit for the “with diagnostics” failure rates, the user must ensure that corrective action is taken when alerts are annunciated. The alert thresholds can be configured using one of the Emerson interfaces.

Should alarms, alerts, or failures be detected during operation, maintenance or periodic inspection and test, record the alarms, alerts, or failures, and immediately take corrective action. To ensure corrective action, continuous improvement, and accurate reliability prediction, the user must also work with their local Emerson service representative to see that all failures are reported. Table 6 shows the diagnostics that are used to calculate the detected failure rates.

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Table 6. Assumed Diagnostics for Determining Failure Rates Labeled “with diagnostics”

HART Command 48

Alert Name Description

Byte 0, Bit 7 Flash Integrity Failure The flash ROM is corrupted. Alert

Byte 0, Bit 6 Minor Loop Sensor Alert

Byte 0, Bit 5 Reference Voltage Failure

Byte 0, Bit 4 Drive Current Failure

Byte 0, Bit 3 Critical NVM Failure

Byte 0, Bit 2 Temperature Sensor Failure

Byte 0, Bit 1 Pressure Sensor Failure

Byte 0, Bit 0 Travel Sensor Failure

Byte 2, Bit 6 NonCritical NVM Alert

Byte 4, Bit 3 Travel Deviation Alert

Byte 4, Bit 0 Drive Signal Alert

The pneumatic relay position reading is out of the valid range.

The electronics has detected a problem with the internal voltage reading.

The I/P converter should be flowing current but is not.

Data is corrupted in the critical section of configuration memory.

The temperature sensor is reporting a temperature <60C or >100C.

One or more pressure sensors is outside the expected operating range.

The travel sensor signal is outside the expected operating range.

Data is corrupted in the noncritical section of configuration memory.

The valve travel is not tracking the set point within the configured deviation allowance.

The controller servo output is out of the normal operating range.

Byte 5, Bit 2 Output Circuit Error The output circuit is not responding. Alert

Device Status, Bit 2 Analog Input Saturated

1. HART host must be configured to read these alerts and annunciate them.

2. This alert can be independently enabled to force the DVC6200 output to the safe state (shutdown on alert - enabled).

The loop current reading is out of the normal operating range.

Digital Valve

Controller Action

Alert

Within table 6, the diagnostics detection time for the failures that can affect the safety function of the DVC6200 instrument is 15 seconds.

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8.2. Test Steps for the Position Monitor

Proof tests are fullstroke tests that are manually initiated. As part of the test, the capability of the SIF to achieve the defined safe state must be verified. If the Position Monitor is used, the Safety Function must be verified. The proof test interval must be established for the SIF based on the failure rates of all the elements within the function and the risk reduction requirements. This determination is a critical part of the design of the SIS. A proof test will detect 88% of dangerous undetected failures not detected by the DVC6200 automatic diagnostics. A proof test includes the following steps:

D Proof Test for the Position Transmitter

 Bypass the safety function of the position transmitter or take appropriate action to avoid a

false trip.

 Using an Emerson Field Communicator, ValveLink software or a DD or DTM based host, verify

that the DVC6200 instrument mode is “In Service” and that the instrument protection is set to “Config & Calib.”

 Inspect the feedback elements for any loose screws or other incorrect mechanical condition.

 Change the valve position away from its current state by more than 5% throughout the range

of travel as required by the application.

 Observe that the position transmitter reports the actual valve position to within 5% accuracy

throughout the tested range of travel through an instrumentindependent means (visual or other).

 Restore the valve to its normal state.

 Observe that the position transmitter reports the actual valve position to within 5% accuracy

through an instrumentindependent means (visual or other).

 Record the test results and any failures in your company’s SIF inspection database.

 Remove the bypass and restore normal operation.

D Proof Test for the Limit Switch

 Bypass the safety function of the limit switch or take appropriate action to avoid a false trip.

 Using an Emerson Field Communicator, ValveLink software or a DD or DTM based host, verify

that the DVC6200 instrument mode is “In Service” and that the instrument protection is set to “Config & Calib.”

 Inspect the feedback elements for any loose screws or other incorrect mechanical condition.

 Change the valve position such that the limit switch trip point is exceeded.

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 Observe that the limit switch changed to the open state within 5% of the trip point through

an instrumentindependent means (visual or other).

 Restore the valve to its normal state.

 Observe that the limit switch changed to the closed state within 5% of the trip point through

an instrumentindependent means (visual or other).

 Record the test results and any failures in your company’s SIF inspection database.

 Remove the bypass and restore normal operation.

8.3. Maintenance

D The effective time to repair the DVC6200 is approximately 2 hours. This comprises of

disassembly, repair, reassembly, and recalibration. This value can be used to determine the total mean time to restore (MTTR).

D Digital valve controller preventive maintenance consists, at a minimum, of replacing all

critical elastomeric seals and diaphragms in the device and a visual inspection of moving components to verify satisfactory condition. The SIS Preventive Maintenance Kit includes all elastomeric seals and diaphragms and is available through your local Emerson sales office. Following maintenance, the digital valve controller must be calibrated per the Auto Travel Calibration or Manual Travel Calibration menu. After calibration, the digital valve controller functional safety must be validated.

D A conservative approach is taken in estimating the service interval for the digital valve

controller in Safety Instrumented Systems. For SIS applications, preventive maintenance must be performed on the digital valve controller at eight to ten-year intervals from the date of shipment. If the instrument is exposed to the upper or lower extremes of the environmental limits, the interval for preventative maintenance may need to be reduced.

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9. Decommissioning Guidelines

When decommissioning a DVC6200 instrument, proper procedures must be followed. Decommissioning includes the following steps:

 Bypass the final control element or take appropriate action to avoid a false trip.

 Bypass the safety function of the position monitor or take appropriate action to avoid a false

trip.

 Avoid personal injury or property damage from sudden release of process pressure or

bursting of parts. Before proceeding with any decommissioning procedures:

D Always wear protective clothing, gloves, and eyewear to prevent personal injury or

property damage.

D Do not remove the actuator from the valve while the valve is still pressurized.

D Isolate and disconnect any operating supply lines providing air pressure, electric power,

or a control signal to the DVC6200. Be sure the actuator cannot suddenly open or close the valve.

D Use bypass valves or completely shut off the process to isolate the valve from process

pressure. Relieve process pressure from both sides of the valve.

D Vent the pneumatic actuator loading pressure and relieve any actuator spring

precompression.

D Use lock‐out procedures to be sure that the above measures stay in effect while you

work on the equipment.

D Check with your process or safety engineer for any additional measures that must be

taken to protect against process media.

 Disconnect the electrical wiring to and from the DVC6200 instrument.

 Disconnect the pneumatic tubing between the DVC6200 instrument and actuator.

 Remove the DVC6200 instrument and the respective mounting parts and feedback elements

from the actuator.

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Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.

Fisher, FIELDVUE, and ValveLink are a marks owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co.

FieldComm Group.

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