3-9
3-2-2 Zero Span Adjustment
After auto setup, check the 0% and 100% positions. If adjustment is required, adjust the
zero span.
The following two zero span adjustment methods are available.
• Method using the LUI
• Method using HART communication (This method is further broken down into the
following four methods.)
- Auto Travel Calibration
- Angle Correction
- Manual Setting
- Change Travel Angle
This section describes the method using the LUI. For the method using HART
communication, refer to Chapter 4.
Handling Precautions:
If you adjust the span after auto setup, the forced fully opening value is
automatically changed to the value calculated by subtracting 1% from the
overstroke percentage.
Cautions
Then zero span adjustment is dangerous because of valve action. Take measures in
advance to prevent injury to personnel and effects on the process in case the valve
operates.
(1) Procedure for adjusting the zero span
Step Work LUI display
1
Loosen two hex socket bolts (2.5 mm) to remove
the front cover.
2
Press and hold the
button to enter Settings
mode. Enter the password if prompted to do so.
For how to enter the password, refer to "3-2-5
Password".
3
Press the button to display the screen on the
right (ADJ).
To Next Page
Loading...
