Range Page
The Range page is displayed when entering calibration mode. The Range page allows the user to enter
the low and high range values for the primary input signal, as well as remote setpoint and process vari-
able if the built-in process controller is enabled (see Chapter 16: Controller Calibration) and allows auto-
matic and manual calibration of the valve position sensor.
•
Low Signal (mA):
This is the value (in mA) of the primary analog input that corresponds to
fully close for air-to-open valve or fully open for air-to-close valve for a SVI configured as a
positioner. A typical value is 4.00 mA. However, if a valve is split ranged, for example, 12.00
to 20.00 mA, the Low Signal is 12.00 mA instead of 4.00 mA.
•
High Signal (mA):
This is the value (in mA) of the primary analog input that corresponds to
fully open for air-to-open valve or fully close for air-to-close valve for a SVI configured as a
positioner. A typical value is 20.00 mA. However, if a valve is split ranged, for example, 4.00
to 12.00 mA, the High Signal is 12.00 mA instead of 4.00 mA.
•
Supply Pressure:
Air supply pressure should be entered in this box. This value is used only
for scaling SVI output pressure signal to engineering units and need not be exact.
52
Figure 39. SVI Calibration
Range Window
Note:
The remote setpoint and process variable range boxes are valid only for SVI built-in
controller and are disabled for SVI as positioner only. See Chapter 16 for controller
related calibration.
Note:
Low Signal and High Signal are used to split range the SVI positioner.
