1. Digital pressure gauge: The absolute value of the maximum allowable error should be no more than 1/4 of the absolute value of the maximum allowable error of the negative gauge.
2. Stopwatch: The division value is not more than 0.1s.
3. Handheld sound level meter: measuring range is (40~120)dB, accuracy is type II or above
4. Manual negative pressure pump: measuring range is (-0.09~0)MP
5. Digital pressure gauge bracket: Place the digital pressure gauge so that the height of the digital pressure gauge is consistent with the height of the negative pressure gauge of the sieve analyzer.
Calibration method
1. Negative pressure gauge calibration (1) Connect the negative pressure gauge to the pressure checker device, and the joint should be sealed and airtight.
(2) Zero error (3) Indication calibration 1 Calibration procedure The index line marked with the magnitude is used as the calibration point. When calibrating, first adjust the zero position, slowly and smoothly increase the negative pressure from the zero position. Take the digital pressure gauge as the standard. After the pressure at each point is stable, tap the negative pressure gauge case to read the indication value (by the division value). 1/10 estimate, recorded to 50Pa). Then hold the pressure for 3min, and return to the zero position in the reverse order of the original calibration point.
2 Error calculation In the forward and reverse strokes, the indication error of each calibration point is calculated by equation (1), and the error values ​​are all in accordance with the requirements of (3).
(4) Steering deflection stability Use the eye force to observe the pointer deflection condition, which should meet the requirements.
2. Time calibration Set the time setting button to the time by the timer on the digital display time controller of the pressure checker (according to the national standard requirement is 120s), press the stopwatch at the same time as the timer is started, and record the running time. The maximum allowable error should not exceed the requirement of 2.4.
3. Noise calibration (1) Start the sieve analyzer to make it in normal working condition, and calibrate the noise of the sieve analyzer when the negative pressure reaches 6000Pa. The sound level meter microphone is placed horizontally at a distance of 1.0 m from the screen and at a height of 1.5 m from the ground. When calibrating, the measurement should be no less than 6 points around the sieve analyzer. The maximum value measured in each calibration point should be used as the noise of the sieve analyzer and should meet the requirements.
(2) When calibrating the noise of the analyzer, the background (environment) noise should be calibrated first, and its value should be at least 10 dB (A) lower than the noise level of the analyzer. If the difference is less than 3dB (A), the calibration result is invalid; if the difference is (3~10) dB(A), the calibration data should be processed according to the normal sound level meter instruction manual.
The study of the calibration method of the pressure calibration table provides a technical basis for calibration of the calibration table, which ensures the scientific and accurate calibration results. After years of practice, it has been proved that the calibration is carried out by this method and fully meets the requirements of quality inspection.
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