Saturday, December 6, 2014

Selecting and Calibrating a Pneumatic Valve Positioner

Most pneumatic valve positioners are designed to work on both rotary control valves and linear control valves. While the linkage and orientation are different, the calibration procedure is the same.

When selecting an industrial valve positioner you should choose one that provides the following features:
  • Easy to install, calibrate and maintain.
  • An auto-calibration feature.
  • Be able to accommodate double acting (DA) or reverse acting (RA) set-up.
  • Error messages for troubleshooting.
  • Allow for fixed input signal testing.
  • Have a programmable characteristic curve with multiple points.
  • Have programming built-in to eliminate overshoot and hunting.
  • Low air consumption.
  • Have NAMUR mounting.
This video demonstrates the typical steps in calibrating a pneumatic valve positioner (in this case, an AT Controls SS2).