Yokogawa YVP20S - Manual (Page 97)

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<Toc> <Ind> <9. CONFIGURATION SERVICES>
IM 21B04C50-01E
● Custom Linearization Dialog
Select the Custom Linearization menu item in the Characterization Dialog to display the
Custom Linearization dialog (Figure 9.11).
Figure 9.11 Custom Linearization Dialog
A custom linearization method built into ValveNavi can be used to correct non-linearity. The
method automatically generates a custom characterization that matches the specific
linkage used. Custom characterization must be the selected configuration option to use the
generated curve. This option is selected automatically when the user clicks OK to accept
the displayed curve.
A custom linearization cannot be used in combination with the equal percentage or quick
opening characteristics. If a non-linearity correction and equal percentage or quick opening
characteristics are both required, use the non-linearity correction in Calibration>Travel
Calibration dialog and adjust the 50% point.
To configure custom linearization, click the Custom Linearization button. The Custom
Linearization window will appear.
Two types of linkages are modeled: simple and compound. Most linkages use the com-
pound linkage system.
NOTE
Custom Linearization uses the same data as Custom Characterization. Therefore, only
one of these configuration options may be used at any one time. Any custom
characterization data will be discarded when Custom Linearization is used.
Simple Lever
The simple lever has the pivot point (the position sensor in the YVP) mounted a fixed
distance (L1) from the valve stem pickup point. In order to compute the proper correction
curve, the stroke length, the distance from the pivot to the valve stem pickup point and the
valve position at horizontal must be entered.