1. Find the nozzle control button of the mechanical positioner: find the nozzle control button on the mechanical positioner, usually a round or oval button.
2. Press and hold the nozzle control button: Press the button to activate it.
3. Adjust the nozzle size: adjust the nozzle size through the control panel of mechanical positioner or other control equipment. You can adjust the diameter, length and angle of the nozzle.
4. Confirm the adjustment result: After the adjustment, confirm whether the nozzle size meets the requirements.