Technical Specifications

637
Calibrate Tab
Open Stop Adjustment
In some valves the stem travel exceeds the nominal valve travel. The SVI2 allows you to
compensate for this so that the valve position reads 100% at the nominal travel.
To make this correction:
1. Enter 100 in the Open Stop Adjustment edit box.
2. Select Find Stops from the context menu. This calibrates the position with the full travel
of the valve.
3. Return to Manual mode and adjust the valve to its nominal travel and note the position
reading.
4. Return to Calibrate mode, enter the position that was measured at nominal travel into
the Open Stop Adjustment edit box and select Open Stop Adjustment from the menu.
The valve now reads 100% at the nominal travel of the valve.
Zero Calibration
1. Click the Calib. Pressure button. A dialog appears.
2. Enter 0 in the pressure value field.
3. Turn the air off and click
Set Low Pressure .
Pressure Calibration Procedure
The Calibrate tab allows you to recalibrate the pressure sensor in the SVI2. The sensor is
calibrated at the factory and does not usually require recalibration, but if needed, this dialog
provides a convenient method. The Reset to Factory menu returns the calibrations to those
that were set before delivery of the SVI2.
The currently measured value of pressure is displayed and can be compared to reference
pressures to see if recalibration is necessary. The procedure for recalibration is:
Gain calibration
1. Right-click and from the popup menu select Full Open (on an ATO valve).
2. Click the Calib. Pressure button. A dialog appears.
3. Enter the supply pressure in the pressure value field.
4. Click Set High Pressure.