Sonic nozzle gas flow standard device verification

Abstract: The verification information of the standard device for gas flow of sonic nozzles is provided by the excellent manufacturers of flowmeters and flowmeters. Sonic Nozzle Gas Flow Standard Device Verification of the Tested Meter Temperature Measurement The temperature of the tested meter is generally measured with Pt100. Since the calibration period of the temperature transmitter is 1 year, it is found that the drift is relatively large in actual use. It is recommended to use the graduation every month. The value is 0.05°C or 0. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the verification article for the standard device of sonic nozzle gas flow. Sonic Nozzle Gas Flow Standard Device Verification of the Tested Meter Temperature Measurement The temperature of the tested meter is generally measured with Pt100. Since the calibration period of the temperature transmitter is 1 year, it is found that the drift is relatively large in actual use. It is recommended to use the graduation every month. A thermometer with a value of 0.05°C or 0.1°C is checked for comparison. During calibration, the cylinder valve should be closed, the air inlet should be completely closed, the thermometer should be located in the center of the pipeline, and the temperature sensing part should be as close as possible to the sensor to be calibrated. Pressure measurement of the tested gauge The pressure measurement of the tested gauge has a great influence on the measurement results of the positive displacement flowmeter and the velocity type flowmeter, and the zero drift of the pressure transmitter cannot be ignored. Compare with data from each pressure sensor. The pressure-taking position of the test meter directly affects the measurement results. Generally speaking, when the flow rate is large, the pressure loss of the turbine flowmeter and the precession vortex flowmeter is large. Except for the orifice flowmeter, the pressure in front of the flowmeter cannot be used instead. For the working pressure of the flowmeter, most turbine flowmeters and precession vortex flowmeters have special pressure-taking holes. In addition, the vortex flowmeters produced by some manufacturers require pressure to be taken from the back of the meter, so it is possible to obtain them from the manufacturer during verification. The maintenance of the watch clamp The gas flow device generally adopts a pneumatic clamp, and the standard device for the gas flow of the sonic nozzle produced in the past few years basically adopts a single-cylinder pneumatic clamp, which has two O-rings: one is used to seal the compressed air leaks to atmosphere; another is used to seal compressed air leaks to the detection line. Due to the frequent use of the watch clamp, it is easy to cause the wear of the O-ring, the cylinder and the telescopic rod, resulting in the leakage of compressed air to the detection pipeline, resulting in large errors. Therefore, in the daily inspection work, it is necessary to insist on oiling the watch clamp; it is best to replace the single-cylinder pneumatic watch clamp with a double-cylinder pneumatic watch clamp if conditions permit. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Sonic Nozzle Gas Flow Standard Device Verification'

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