1. Look at it visually.
2. Verify the sealing and preloading of the system.
3. The pressure sensor is equipped on the pressure standard equipment, including the pressurization (or vacuuming) equipment, and the pressure standard equipment with liquid as the pressure transmission medium should sweep the air in the pipeline.
4. Instruments and equipment such as pressure sensors, excitation power supplies, and reading recording equipment should be adjusted according to the regular line connection to make them in normal operating condition.
5. After the verification system is properly connected to the equipment, preheat it for half an hour, and then pressurize the verification system to the upper limit of measurement or evacuate it to the lower limit of measurement). After the pressure is stable, keep the pressure constant for more than 1 minute, and then gradually ventilate the atmosphere for 3 consecutive times. When the pressure is constant, investigate the readings of the device's indication and check the tightness of the piping system, which must not affect the leakage and shaking of the validation.
6 Indicate verification
7 view points. For pressure sensors with an accuracy level lower than 0.1 (including 0.1), at least 6 verification points (including zero) should be uniformly or reasonably selected within the measurement scaleFor pressure sensors with an accuracy level higher than 0.05 (including 0.05), at least 9 verification points (including zero) should be selected evenly or reasonably within the measurement scale. Pressure sensors.
For pressure sensors that include positive and negative pressure, you can check the positive pressure and negative pressure separately.
8. Verification method, verification from the lower limit of measurement to zero point), the Leli or a kind of straight air is steadily raised to the measurement of Leli sensor (observance), and the positive value of each verification point is recorded. The stroke output value, and then, after the hydraulic pressure is set on the upper limit of the input volume (or the lower limit of the measurement), the reverse stroke output value of the pressure sensor on the upper limit of the observation area is recorded, and then the low force (or Shengle) of the new peak is determined to the lower limit or zero of the measurement), and the reverse stroke output value of each verification point is recorded in order.
During the verification process, the voltage should be smoothly boosted or stepped down to avoid overshoot or callback.
9. The reciprocating stroke of the positive and negative stroke verification is a cycle, and the force sensor with an accuracy level of less than 0.1 (including 01) should be used for 3 cycles: the force sensor with an accuracy level higher than .05 (including 0.05) should be used for at least 4 cycles in the entire measurement scale, and the pressure sensor has m calibration points for n cycle calibration.
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