3 smart positioner

April 11, 2023 PMI Revision 00 1

SMART POSITIONER

SYSTEM


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


• Hart Protocol transmit waveform• Two Way Digital Communication

How Digital Positioners Communicate


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®


• 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


Flow Curves

0

20

40

60

80

100

0 20 40 60 80 100Input

Out

put

Quick Opening

LinearEqual % 50Equal % 30

Traditional Characterization


Positioner Custom characterizationSolves Many Issues


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


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


Diagnostics TestingBasic vs. Advanced

Online vs. Offline


• Position Signature

Dynamic Statistical Analysis

2” 78200 0.375” Stroke



• Zoom Scale @ 11 %


2” 78200 0.375” Stroke




• Blue Trace Signal to Retract


2” 78200 0.375” Stroke





• Red Trace Signal to Extend


2” 78200 0.375” Stroke






• Note Galling indications for the 6 % of initial stroke


2” 78200 0.375” Stroke







• Also note that 6% of 0.375 is 0.022 “ of stroke


2” 78200 0.375” 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


2” 78200 0.375” Stroke


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


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


THANK YOU

3 smart positioner

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