4.4 Additional functions
The ‘Additional functions’ offer the possibility to execute a complete auto calibration or any
manual calibration. Please note that calibration cannot take place during normal process
conditions. If you use a HART® network, be sure to select the correct device.
‘Low/High Calibration’
Use ‘Low/High Calibration’ to calibrate the open and closed position.
‘Setpoint Capture’
The ‘Setpoint Capture’ function allows you to calibrate the SmartCal to the mA signal for open
and closed position. The values of ‘Setpoint Capture’ in the ‘Parameter’ menu will be changed
accordingly.
‘Position Capture’
With ‘Position Capture’ you can define the operating area of the SmartCal. There are three
different ways to define the ‘Position Capture’: ‘Analog’, ‘Digital’ and ‘Digital tuning’. Each
selection has its own menu. Please follow these instructions in order to carry out the appropriate
calibration.
The ‘Analog’ selection uses the mA signal to set the valve to the correct open/close position. Upon
confirmation, this position is saved in the SmartCal.
The ‘Digital’ selection uses a value field to set the positioner to the correct position. For example:
if you want the valve to be 15% open at 4 mA, enter the value 15.
After selecting ‘Digital tuning’, select one of the pre-defined steps to change the valve position
(-5, -1, -0.1, OK, +0.1, +1, +5) and confirm. You can adjust the position as often as required.
Select OK to complete the procedure.
‘Auto PID Calibration’
The SmartCal positioner has a built-in PID controller to optimize valve control. Use the ‘Auto PID
Calibration’ to recalibrate the control loop.
page 22
AVID SmartCal valve positioner
Installation & operating instructions
