Positioner

 

PositionerDVC2000z

 

 

 

Role of a Positioner                                                        Back_To_Top

 1.roleofapos

 

 

 

 

Conventional vs SMART Positioners                    Back_To_Top

 

 

4.conventional

Mechanical Construction

  • Bellows and Linkages

Requires alignment / adjustment

High Hysterisis & Deadband

Difficult to Calibrate

 

 

 

 

4.1dvc2000

Modular Construction

Universal Compatibility & Mounting

Ease of Calibration & Mounting (Local or Remote)

High Accuracy

Diagnostics & Tuning capabilities

 

 

 

 

 Friction: Deadband & Hysteresis                                     Back_To_Top

 

 

2.deadband

 

 

 

Limit Cycle: Result of Friction                                    Back_To_Top

 

 

 

3.limitcycle

 



Overcoming Friction Effects

 

3.1overcomingfrictioneffects

 

 

 

Improving Process Variability                                 Back_To_Top

 

5.improvingprocessvariability

 

  • Set point often higher than desired/ optimum to cater for errors/ hysterisis/ deadband in pneumatic or analog instrumentation
  • Digital instrumentation allow for better process control and reduced variability
  • Allow opportunities for revised setpoints
  • Savings derived in using lesser process medium to achieve process requirements; eg: lesser steam/ glycol to achieve heating/ cooling setpoints

 

Justification Summary

 

Operational Improvement

  • Better control/ lower variability allows
    • Reduction in wastage from excessive steam/ glycol usage
    • Better product quality & output
  • Lower air consumption with DVC2000 (2.3scfh) as compared to 3661 (8.8scfh) leads to savings in utilities usage/ compressor efficiency
  • Simplified inventory from a common platform
  • Simplified Engineering & Selection

 

Design - Reduces Cost                                                        Back_To_Top

 

 

  • 6.designreducescostLinkage free
  • No contacting parts
  • Hall sensor / magnet array in the channel on the back of the DVC2000 housing
  • Approximately 80% of your positioner problems are linkage related - These problems will be eliminated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6.communicationoptionsDVC2000 Communication Options

 

  • Local User Interrface
    • Pushbuttons/LCD on every unit
  • 375 Field Communicator
    • New Device Descriptions (DD’s)
  • Powers PlantWeb
    • AMS Software
    • AMS ValveLink Software

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