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Aira control valve calibration, particularly for electro-pneumatic positioners, involves setting the 4mA signal to 0% valve opening (zero) and 20mA to 100% (span) using the zero/span wheels or potentiometers. Ensure supply air is 4-6 bar, set 4mA to adjust the zero until the valve is closed, then 20mA to set the span, repeating until accurate.
Aira Electro-Pneumatic Positioner Calibration Steps
Preparation: Isolate the valve, supply air (typically 4-6 bar), and connect a 4-20 mA calibrator to the positioner input.
Zero Adjustment (4mA): Apply 4 mA. If the valve is not at 0% (closed), adjust the zero potentiometer/wheel.
Span Adjustment (20mA): Apply 20 mA. If the valve is not at 100% (open), adjust the span screw/wheel.
Verification: Repeat steps 2 and 3 until the valve moves accurately between 0% and 100%.
Feedback Calibration: If equipped, ensure the feedback loop matches the valve position by checking the positioner display at 4mA and 20mA, adjusting feedback potentiometers as needed
Aira control valve calibration procedure
Aira control valve calibration procedure pdf
Aira control valve calibration pdf
Aira control valve calibration manual pdf
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