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The Fisher valve positioner needs to be calibrated before use. So what are the specific calibration steps? As a supplier of valve positioners, we have summarized the debugging steps for these positioners in the hope that it will be helpful to everyone. Fisher valve positioner calibration steps: ① Open the front cover of the positioner and the power wiring box. ②Connect a stable gas source to the filter pressure regulator and seal it tightly. ③Distinguish between the positive and negative terminals and connect the signal input device properly. ④Turn on the gas supply switch, adjust the \"0\" knob downward until the pointer on the exhaust pressure gauge is not at 0, then slowly rotate the \"0\" knob in the opposite direction until the gauge pointer is exactly at 0. ⑤Input signals of 25% (8mA), 50% (12mA), and 75% (16mA), and observe the downward or upward movement of the pointer: 1. Determine the degree of adjustment based on actual conditions, making slight adjustments one by one while testing. If a single stroke is less than 1/4 of the dial or too small, it indicates that the range of the locator is too limited; in such cases, the range adjustment knob should be used – first loosen the screw, then adjust the knob below in the “+” direction. 2. If a single stroke exceeds 1/4 of the dial, it indicates that the range of the positioner is too large. In this case, adjust the range control knob by first loosening the screw, then turning the knob below in the “–” direction. ⑥After adjusting the range knob each time, repeat the test. If the actual travel distance is close to the theoretical value, adjust the \"0\" knob to move the pointer to the corresponding scale, then apply a signal to check whether the pointer moves correctly. If the difference between the actual travel and the theoretical travel remains large, adjust the range control knob again. The above outlines the detailed steps for debugging Fisher valve positioners. In the future, when using these positioners and needing to carry out debugging, one can follow these steps, which will help avoid errors and ensure accurate results.