[ Instrument Network Instrument Development ] At present, China's trade settlement of gas is mainly based on volume flow, and the measuring instruments used are mainly smart gas flow meters. It consists of a flowmeter base meter and a gas volume corrector. The flowmeter base meter is usually a turbine flowmeter, a lumbar flowmeter, etc., which measures the cumulative volumetric flow of the gas under operating conditions (20 ° C, 101.325 kPa) (ie, cumulative flow of operating conditions).
The volume correcting instrument receives the pulse signal output from the base meter of the flow meter and the temperature and pressure sensor signals provided by the meter, and calculates the cumulative volume flow (ie, the cumulative flow of the standard condition) under the gas standard reference condition by the mathematical model to realize the trade metering. And display, store and output. The accuracy of the volume corrector's measurement of the temperature sensor, pressure sensor and flowmeter base meter output is directly related to the accuracy of trade measurement.
At present, most of the industrial gas metering processes in the market use a volume corrector, but at present, the calibration/calibration object of the gas flow meter in China is mainly the flow meter base table. The verification/calibration of the volume corrector is mainly used. The way in which the pressure sensor, temperature sensor, and flow signal are detected separately. Specifically, the detection of the pressure portion of the volume corrector pressure sensor mainly uses a hand-held pressure pump with a digital pressure gauge. The detection process has problems such as cumbersome pressing process, high pressure not easy to reach, and airtightness defects; The detection is mainly carried out by using a dry metering furnace. The time required for the temperature rise and decrease process in the test is long, and the temperature sensor of the partial volume corrector is large in volume, and cannot be deeply placed in the dry metering furnace, which makes it impossible to accurately detect; The reading of pressure, temperature and flow data is done by manual reading, and the human factor is large. Therefore, it is urgent to provide a new type of gas flow volume corrector detection device, which can conveniently and accurately verify the volume corrector.
In response to the above problems, the Flow Measurement Room of the Metrology and Testing Institute of Suzhou City has developed a “Automatic Detection Device for Gas Flow Volume Correctorâ€. The device can realize automatic rapid adjustment of pressure point and constant voltage, temperature constant and automatic data acquisition, which greatly improves the verification efficiency and accuracy.
Recently, the device was awarded a utility model patent certificate issued by the State Intellectual Property Office.
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