1. Sensitivity test: increase and decrease the air pressure at the stroke of signal pressure 0.03, 0.06, 0.09Mpa respectively, test the signal pressure change value required when the piston rod starts to move 0.1mm, the maximum change should be ≤ 0.2%;
2. Airtightness test of piston cylinder: Connect 0.5 Mpa pressure into any air chamber of the cylinder, then cut off the air source, within 10 minutes, the pressure drop in the cylinder should not exceed 0.01 Mpa; ※
3. Position Transmitter electrical zero detection: open the upper cover of the position transmitter and connect the wires; input a 12mA current signal (0.06 Mpa), and adjust the circular eccentric wheel in the transmitter so that the black wire on it is on the circuit board Align the white lines of the
position transmitter; then input 4mA current (0.02 Mpa), at this time, you can adjust the zero potentiometer in the transmitter to make the output current 4mA; the electrical zero error should be ≤1%; 4. The electrical full range of the position transmitter Detection: Input a 20mA current signal (0.1 Mpa), at this time, adjust the range potentiometer in the transmitter to make the output current 20mA; the electrical full-scale error should be ≤1%;
5. Position feedback current full-stroke deviation calibration: input 4mA Current (0%), and then gradually increase the input signal 8mA current (25%), 12mA current (50%), 16mA current (75%), 20mA current ( 100%), taking into account the linear displacement into the nonlinearity of the angle change Error: 0%, 50%, 100% point feedback current error should be ≤1%, 25%, 75% point feedback current error should be ≤2 %;
6. Position feedback current positive and negative stroke variation test: same as cylinder positive and piston negative The stroke variation test method is the same, the actual positive and negative position feedback current-in the stroke relationship, the maximum difference between the positive and negative stroke values of the cylinder piston under the same feedback current value must be ≤ 1%;
7. Make a calibration record and press the calibration The contents on the record form are carefully filled out item by item, and the inspector must sign;
8. After the above tests are passed, the pneumatic actuator should plug in the wiring terminal of the position transmitter, tighten the back cover, and then plug the air source inlet of the valve positioner with a plastic plug.
