Calibration Guide for Fisher 3582 Pneumatic Positioner

Introduction to Fisher 3582 Pneumatic Positioner

Prerequisites

• Beam alignment should be performed prior to the calibration of the Fisher 3582 pneumatic positioner.
• A supplementary pressure control mechanism should be arranged during the calibration. This is required to prevent injuries and accidents due to potential sudden pressure released during the calibration.
• The operator should wear personal protective gear to prevent self-harm during calibration.  

Calibration Procedure of Fisher 3582 Pneumatic Positioner

1. Shut the supply pressure off to the valve positioner.
2. Check the tubing from the valve positioner’s output to the control valve actuator’s input. Connect/reconnect the tubing and set the input signal to a mid-range value.
3. Adjust the flapper assembly to approximately 6^th position in the operating quadrant of the beam. The flapper can be direct or reverse acting.
4. Supply pressure to the valve positioner until the 0 degree marking on the rotary shaft arm matches with the case index mark. This ensures that the actuator is at a mid-travel position.
   • Note
   • If the mid-travel position of the actuator is not set, check if any minor height adjustment for the pressure nozzle is needed.
   • Check for any loose linkages or errors in cam installation.
5. Apply input signal of the lowest value of input signal range for the positioner. In the case of Fisher 3582 pneumatic positioner, the input signal range remains 0.2 to 1 bar (3 to 15psig).
6. Loosen the nozzle locknut until the actuator moves to an accurate location of mid-travel. Once this condition is set, consider this location as a zero reference point.
7. Now apply the input signal of the highest value to the input signal range. Examine the stem travel after application of the highest input signal. If the stem travel is within range, the Fisher 3582 pneumatiac positioner is calibrated. If not, adjust the stem travel by adjusting the flapper assembly.