Fisher® FIELDVUE™ DVC6200 SIS Digital Valve Controller-Emerson Process Management

Fisher® FIELDVUE™ DVC6200 SIS Digital Valve Controller

10356

103

154

与供应商联系

收藏点赞

产品描述

产品目录

产品视频

The operation of many industrial processes involves inherent risk. Instrumented protection systems are specifically designed to reduce the severity of the impact of an emergency event. These systems, such as Safety Instrumented Systems (SIS), are designed to monitor a process for potentially dangerous conditions. During an emergency event, the SIS instrument activates the valve to move the process to a safe state.
What happens if the valve does not move when an emergency event occurs? Personnel safety, equipment damage, and environmental protection could be at serious risk.

Traditionally, a pneumatic test panel located near the valve provides a means to exercise the valve to ensure operation when called upon. However, the procedures to test the valves are labor-intensive, cumbersome, and may require the valve to be locked in a fixed position or bypassed.

FIELDVUE™ digital valve controllers installed on emergency shutdown valves offer state-of-the-art testing methods. Using HART® communication, the 475 Field Communicator or ValveLink™ Software replace the function of the pneumatic test panel to verify operation of the emergency shutdown valve. The results are improved system performance and valve diagnostic capability along with a reduction in testing time and initial investment cost.

Partial stroke testing – This test checks for valve movement without fully stroking the valve. Many applications will allow 10% movements to verify valve response without upsetting the critical process line. Diagnostic data is collected and an alert is given if the valve is stuck.
Step response test – This test analyzes overshoot, hysteresis, dead time, and stroking time.
Valve signature test – This test can be used to benchmark valve performance by identifying friction, spring rate, seating forces and bench set.
Automatic testing – A scheduling and batch running tool within ValveLink Software can be used to automate multiple diagnostic tests.

Features & Benefits
Increased System Availability—The simple and secure method of partial stroke testing allows end-users to perform more frequent valve mechanical movement tests. This reduces the PFD factor. Because the test procedures are flexible, they can be conducted at any time, providing more assurance the system will be available upon demand. In addition, continuous valve monitoring through Fisher AMS™ ValveLink™ Software provides awareness of the valve's status.
Reduced Cost of Ownership—Lower base equipment cost with considerable reduction in testing time and a reduced manpower requirement makes this solution economically feasible. Fisher DVC6200 SIS Series digital valve controllers offer an economic alternative to expensive pneumatic test panels and skilled personnel presently required for testing Safety Instrumented System valves.
Valuable Time Savings—Remote testing capability requires fewer maintenance inspection trips to the field thus saving considerable time. Using ValveLink Software's Batch Runner to establish an automatic test routine can also provide increased time savings.
Predictive Maintenance—DVC6200 SIS Series instruments permit using ValveLink Software to provide Valve Degradation Analysis, which is important for critical valves in shut down systems. This may also reduce the amount of scheduled maintenance.
Valve Stuck Alert—While performing the partial stroke test, if for any reason the valve is stuck, the digital valve controller will not completely exhaust the actuator pressure. This reduces the likelihood that the valve will slam shut should it become unstuck. The digital valve controller will abort the test and set an alert indicating that the valve is stuck. The alert is accessible through either the 475 Field Communicator or ValveLink Software.
System Audit Documentation—Using ValveLink Software provides a time and date stamp on all tests and reports, which is important for documenting compliance with the requirements of statutory authorities.
Verification—ValveLink Software provides the capability for comparing and interpreting diagnostic data.
Device Initiated Partial Stroke Test Available—DVC6200 SIS Series digital valve controllers allow a partial stroke test, which ramps valve travel a small amount, while the valve is in-service and operating. Should a demand arise during the test, the test is overridden immediately and the valve moves to the safe state. The partial stroke test can be automatically scheduled and initiated by the device itself or can be performed manually by the user. Configuring the time interval between tests for a device initiated partial stroke test automates the process.
Built-In Redundancy—When used in conjunction with a solenoid valve DVC6200 SIS Series digital valve controllers provide an inherent redundant pneumatic path. Should an emergency situation arise, the actuator pressure exhausts through either the solenoid valve or through the digital valve controller, allowing the valve to move to the safe position.
Reduced Wiring Cost—DVC6200 SIS Series instruments eliminate the need for position transmitters and separate wiring from the transmitter. Through HART® protocol, the valve position is communicated over the same 4-20 mA analog loop that provides the valve control signal. A HART-to-analog signal converter in the control room can provide a 4-20 mA signal that is proportional to valve position. The HART-to-analog signal converter can also provide discrete contact outputs to the logic solver, which may replace hard-wired limit switches.
Device Integrity Continuously Checked—When "End Point Pressure Control Mode" is enabled, the digital valve controller remains constantly in control while the valve is at its normal position (either fully open or fully closed); it is not allowed to reach a saturated state. The digital valve controller constantly tests its internal components, and if any component fault is detected, it sets an alert which may be accessed through either the 475 Field Communicator or ValveLink Software.
Manual Reset—The DVC6200 SIS can be configured to hold the tripped state until a local reset button is pressed. Manual reset can be initiated by pressing the built-in button on the optional LCP100 local control panel. Alternatively, if the LCP100 is not used, a user-supplied push button can be used to short the AUX terminals.
Trigger Functionality—Data can be collected and stored in the memory of the DVC6200 SIS digital valve controller. Trip event data can be accessed for an audit and presented to a regulatory or insurance authority when the DVC6200 SIS operates with 4-20 mA. The trigger will initiate on-board data collection based on a change in actuator pressure, valve travel, input current, pressure differential, travel deviation, travel cutoff, or auxiliary input/external trigger. The data is stored on board the device for later retrieval, and is retained in the event of a power loss.
Solenoid Testing—When a solenoid valve is installed between the DVC6200 SIS pressure output and the actuator, the control valve assembly can be configured to verify the operation of the solenoid valve. In single acting actuator applications, the "unused" output port of the DVC6200 SIS can be piped such that the pressure downstream of the solenoid valve is measured. When the solenoid valve is pulsed, the DVC6200 SIS can sense the momentary pressure drop across the solenoid valve. If the pulse is short enough, the emergency shutdown valve will not move or disrupt the process. This not only increases the availability of the solenoid valve during a safety demand, but also enhances the reliability of the SIF (Safety Instrumented Function) loop.
Spurious Trip Protection—The DVC6200 SIS Series digital valve controller can be supplied with a reverse acting relay to provide maximum output pressure at minimum input signal. This solution provides trip protection because loss of control signal will not cause the valve to trip (i.e. the relay stays at maximum output pressure).