Gas mass flowmeter can realize automatic temperature compensation and zero drift correction

With the rapid development of modern electronic measurement technology, gas mass flowmeters have made great progress in sensor material structure, electronic components and measurement software, etc., which can realize automatic temperature compensation and zero drift correction, flow, density and temperature. The measurement accuracy is constantly improving, the functions are becoming more and more perfect, and the on-site use and maintenance are more convenient. (1) Flow measurement accuracy. At present, the mass flowmeters produced by most manufacturers can be used for the measurement of liquid hydrocarbons, and their measurement accuracy is better than±0.2%, which can meet the technical requirements of flowmeters for domestic custody transfer of liquid hydrocarbons not lower than 0.2. (2) Density and temperature measurement. Density and temperature measurements are important for mass flow meters to achieve accurate measurements. After continuous improvement, the density measurement accuracy of most mass flowmeters can reach ±0.5kgm at present, and the enhanced mass flowmeter can reach ±0.2kgm, which is equivalent to the measurement accuracy of liquid density meters. (3) No zero adjustment function. Zero drift has always been a difficult problem affecting the accuracy of online mass flowmeters. In order to solve this problem, the mass flowmeter has realized the zero-adjustment-free function of automatic correction of zero drift, which not only simplifies the maintenance operation of the flowmeter, but also improves the measurement accuracy of the flowmeter, especially the measurement accuracy of small flow points. The installation and maintenance requirements of the flowmeter are reduced, and the adaptability of the environment (such as temperature and stress) is further improved. (4) Structural characteristics. In order to obtain different measurement characteristics, the gas mass flowmeter has a variety of structural shapes, mainly U-shaped, shallow elbow, single straight pipe and double straight pipe, etc.; special shapes include B-shaped and spiral. (5) Electronic components and measurement software. The improvement of flow, temperature and density measurement accuracy is largely due to the development of electronic technology. From analog transmitters to digital transmitters, various flowmeter manufacturers have made great improvements in electronic components and measurement software, and have introduced many powerful new transmitters. The above-mentioned new transmitters have the following characteristics: ①It can realize wide range and high accuracy measurement, the measurement range can be from liquefied petroleum gas to high viscosity heavy oil and other media, and the measurement accuracy of gas mass flow can reach±0.35%; ②Due to the improvement of density measurement accuracy, the volume measurement accuracy has also been greatly improved; ③Some new flowmeters have the function of concentration detection. It can be used to measure the net oil quantity of water-containing crude oil; ④ It can simultaneously complete the measurement of multiple variables such as mass, volume, temperature and density. Due to the simultaneous and accurate measurement of multiple parameters, the gas mass flowmeter can be used for multiple purposes. While measuring the flow rate, it can replace the online water content analyzer or density meter to complete the measurement of the water content or mixed density of crude oil. This is of great significance to reduce the number of instrument interfaces, simplify the measurement process, and make the measurement system more convenient and reliable.

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