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Methods and
Procedures
(Offline)
Valve metrics trending (Pos, SetPt, Act,
Sup)
X
X
X
Step Test
X
X
X
Ramp Test
X
X
X
Standard Valve Signature
X
X
Extended Valve Signature
X
X
Signature Storage
X
X
Online Valve
Diagnostics
(Online)
Friction
X
RMS Error
X
Upper Spring Range
X
Lower Spring Range
X
Obstruction - Flag
X
Position of Obstruction
X
Offset Error
X
Stick Slip - Flag
X
Amplitude of Slip in Stick Slip
X
Confidence Indicator of Stick Slip
X
Cycle Rate of Position Cycling
X
Amplitude of Position Cycling
X
Cycle Rate of Setpoint Cycling
X
Amplitude of Setpoint Cycling
X
Tight Shutoff Count
X
Tight Shutoff Rate
X
Calibration Error
X
Table 19: Model and feature comparison
Diagnostic
Type
Description
Device Diagnostic Level
Standard Advanced Online Valve