3 smart positioner
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April 11, 2023 PMI Revision 00 1
SMART POSITIONER
SYSTEM
April 11, 2023 PMI Revision 00 2
Pressure Sensor Position Sensor
Microprocessor
Current Generator
EPC
0 to1.4 mA
COMMON SUPPLY
OUTPUT
EXHAUST
EXHAUST
4.5 to 7.5 psi
Temperature Sensor
Push Buttons LCD
Operating Logic Block of Digital Positioner
April 11, 2023 PMI Revision 00 3
• Hart Protocol transmit waveform• Two Way Digital Communication
How Digital Positioners Communicate
April 11, 2023 PMI Revision 00 4
History Lesson
Smart - HARTSmart - HARTSVI PositionerSVI Positioner
ValVueValVue
Smart - FieldBus FVP Positioner
ValVue FFSmart - HARTSmart - HART
SVI II PositionerSVI II PositionerValVue ™ 2.0ValVue ™ 2.0
Conventional Conventional PositionerPositioner
Value & Value & PerformancePerformance
Smart - HARTSmart - HARTDLT LevelDLT Level
Smart - HARTSmart - HARTAMSAMS
- Compliance- Compliance- SNAP ON® - SNAP ON®
April 11, 2023 PMI Revision 00 5
• Diagnostics Online or On Demand:
– Advance Valve Signatures– Step Response & Stroking Speed– Friction– Valve Travel Odometer– Calibration & Configuration History– Valve Signatures stored @ the Valve
Available Diagnostics
April 11, 2023 PMI Revision 00 6
Flow Curves
0
20
40
60
80
100
0 20 40 60 80 100Input
Out
put
Quick Opening
LinearEqual % 50Equal % 30
Traditional Characterization
April 11, 2023 PMI Revision 00 7
Positioner Custom characterizationSolves Many Issues
April 11, 2023 PMI Revision 00 8
Ease of set-up & Calibration Self Tuning- Special Settings Improved Accuracy Custom Characterization Curves Diagnostics – Lower Maintenance Costs Severe Applications – Remote Mounting Basic Digital Positioner Closes Price Gap Lower Total Cost of Ownership
Digital PositionerBenefits- New Installations
April 11, 2023 PMI Revision 00 9
Pro’s Improved Performance New Diagnostics Capabilities Longer Valve Life & Less Trim Repairs Lower Maintenance Time & Costs Plant Standardization
Con’s Somebody has to do the leg work and training Initial Investment takes few years to see
return
Digital PositionerRetrofits – Pro’s & Con’s
April 11, 2023 10
PC Solutions
Control Evolution
Past Present Future
DCS Solutions
Analog
Proprietary Bus
Field Based Application Solutions
Open Field Bus
April 11, 2023 PMI Revision 00 11
Diagnostics TestingBasic vs. Advanced
Online vs. Offline
April 11, 2023 PMI Revision 00 12
• Position Signature
Dynamic Statistical Analysis
2” 78200 0.375” Stroke
April 11, 2023 PMI Revision 00 13
• Position Signature
• Zoom Scale @ 11 %
Dynamic Statistical Analysis
2” 78200 0.375” Stroke
April 11, 2023 PMI Revision 00 14
• Position Signature
• Zoom Scale @ 11 %
• Blue Trace Signal to Retract
Dynamic Statistical Analysis
2” 78200 0.375” Stroke
April 11, 2023 PMI Revision 00 15
• Position Signature
• Zoom Scale @ 11 %
• Blue Trace Signal to Retract
• Red Trace Signal to Extend
Dynamic Statistical Analysis
2” 78200 0.375” Stroke
April 11, 2023 PMI Revision 00 16
• Position Signature
• Zoom Scale @ 11 %
• Blue Trace Signal to Retract
• Red Trace Signal to Extend
• Note Galling indications for the 6 % of initial stroke
Dynamic Statistical Analysis
2” 78200 0.375” Stroke
April 11, 2023 PMI Revision 00 17
• Position Signature
• Zoom Scale @ 11 %
• Blue Trace Signal to Retract
• Red Trace Signal to Extend
• Note Galling indications for the 6 % of initial stroke
• Also note that 6% of 0.375 is 0.022 “ of stroke
Dynamic Statistical Analysis
2” 78200 0.375” Stroke
April 11, 2023 PMI Revision 00 18
• Position Signature
• Zoom Scale @ 11 %
• Blue Trace Signal to Retract
• Red Trace Signal to Extend
• Note Galling indications for the 6 % of initial stroke
• Also note that 6% of 0.375 is 0.022 “ of stroke
• Notice 0.8 mA dead zone due to Friction from 20 mA to 19.2 mA
Dynamic Statistical Analysis
2” 78200 0.375” Stroke
April 11, 2023 PMI Revision 00 19
As Built Factory Signature for 2 Inch Rising Stem
• #6 Multispring Actuator
• Air to Open
• Spring to Close
• 11 - 23 # Bench Range
• Teflon / Kevlar Packing
• Factory Signature Speed Range 1
Original Findings
April 11, 2023 PMI Revision 00 20
Incorrect Stem Adjustment
• Signature compares current and factory signature
• Note: Dramatic shift to right of curves
• Note: Diagnostic data spring range has shifted
• Indication: Incorrect stem adjustment or overseated plug.
• Recommendation: Readjust stem position & retest
Original Findings Current Findings
April 11, 2023 PMI Revision 00 21
THANK YOU
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