Differential pressure transmitter
The differential pressure transmitter is a tool to measure the pressure difference between the two ends of the transmitter. The biggest difference between the differential pressure transmitter and the ordinary pressure transmitter is that the differential pressure transmitter has two pressure interfaces, and the measured data will be accurate only when the positive pressure end of the differential pressure transmitter is greater than the negative pressure end. At the same time, the output standard signal of differential pressure transmitter is generally 4-20mA, 0-5V. Its main working principle is that the result measured by the differential pressure transmitter is the pressure difference, that is, △ P=ρ g △ h. Since the oil tank is usually cylindrical, the area S of its section circle is constant, so the gravity G=△ P · S=ρ g △ h · S, S is constant, and G is proportional to △ P. That is, as long as the △ P value is accurately detected, it is inversely proportional to the height △ h. When the temperature changes, although the oil volume expands or shrinks, the actual liquid level increases or decreases, the detected pressure remains unchanged. If the user needs to display the actual liquid level, the medium temperature compensation can also be introduced to solve the problem.
1. Classification of differential pressure transmitter
Intelligent differential pressure transmitter, high static pressure differential pressure transmitter, micro differential pressure transmitter
2. Common applications of differential pressure transmitter
In Wenzhou New Century Oil Depot Project, the author applies this idea to the actual design. Design condition: 2000m3 oil tank, diameter d=14.5m, height can get the actual oil inventory G, and its density ρ h=14m can also be seen from the formula. Primary meter: flange type flameproof differential pressure transmitter is selected to prevent the pressure pipe from being blocked due to the sediment of dirt at the tank bottom. The transmitter range is 0~140kPa. Secondary meter: use intelligent light column display alarm, universal signal input, can arbitrarily change the range, use light column display liquid level, use digital display oil tonnage. Taking 6 # tank as an example, S=π× r2=3.14 × 7.252=165m2, with a height of 14m. At the top of the oil tank, the differential pressure transmitter is designed with a set of liquid level alarm device as a double fuse. In application, the measured value is directly tonnage, so no matter what kind of oil is stored in the oil tank, the value displayed in the secondary table is the tonnage of oil in the oil tank, avoiding the trouble of measuring density for conversion. In general, the oil products of differential pressure transmitter are delivered by pump and measured by oval gear flowmeter. Due to the limited accuracy of the flowmeter, the highest level is only 0.2. The differential pressure transmitter also needs to measure the density calculation, and the results are often inconsistent, resulting in metering disputes. Because the measurement result of oil tank is tonnage, and the accuracy can reach 0.2 or even 0.1, the measurement result of differential pressure transmitter is more accurate than that of volumetric flowmeter. Although the absolute error of the measurement results is large due to the resolution when a small number of oil products are delivered in and out of the warehouse, the differential pressure transmitter is incomparable with other measurement methods for its high accuracy and small relative error when a large number of oil products are delivered in and out of the warehouse, especially suitable for monthly, quarterly and annual inventory. The practice shows that its main advantages are: ① simple and convenient installation and maintenance; ② The reading is direct and clear, and the inventory of oil products can be read directly; ③ The measurement and conversion of density are exempted.
3. Development history of differential pressure transmitter
The development of differential voltage transformer is closely related to the development of medical, chemical, metallurgical and other industries in the country. Especially in recent years, with the development of science and technology and the increase of national policy investment in these industries, the development of differential pressure gauges has also become very rapid. At the same time, based on the rapid development of our market, the future market of differential voltage transformers will also appear to have more potential. Of course, the production enterprises that need differential transformers here should also improve the performance of differential transformers with the development of science and technology. With the popularization and application of dry-type transformers, their production and manufacturing technology has also made great progress. It can be predicted that future dry-type transformers will be further developed in the following aspects: (1) Energy saving and low noise: With the introduction of new low consumption silicon steel sheets, foil winding structures, stepped iron core joints, environmental protection requirements, noise research, and computer optimization design and other new materials, new processes, new technologies, the future dry-type transformers will be more energy-saving and quiet. (2) High reliability: improving product quality and reliability will be people's unremitting pursuit. ⑶ Environmental protection characteristics certification: based on the European standard HD464, carry out the research and certification of dry type transformer's weather resistance (C0, C1, C2), environment resistance (E0, E1, E2) and fire resistance (F0, F1, F2) characteristics. ⑷ Large capacity: expand from 50~2500kVA dry-type transformer dominated by distribution transformer to 10000~20000kVA/35kV power transformer. With the continuous increase of urban power load, urban power grid regional substation is more and more deep into urban center, residential quarters, large factories and mines and other load centers, and 35kV large capacity residential center power supply transformer will be widely used. (5) Multi function combination: from a single transformer to a multi-functional combined transformer with air cooling, protective casing, temperature computer interface, zero sequence transformer, power metering, enclosed bus and side outgoing line. It can be predicted that the distribution transformers in the 21st century will be resin insulated dry-type transformers with superior performance, low noise and energy saving.
4. Business opportunity of differential pressure transmitter
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5. Brand of differential pressure transmitter
6. News of differential pressure transmitter
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1. Overview Among all kinds of instruments, the transmitter is the most widely used, which is generally divided into pressure transmitter and differential pressure transmitter. Transmitters are commonly used to measure pressure, differential [Detailed]
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1. Overview Among all kinds of instruments, the transmitter is the most widely used, which is generally divided into pressure transmitter and differential pressure transmitter. Transmitters are commonly used to measure pressure, differential pressure [Detailed]
7. Differential pressure transmitter enterprise
8. Quotation of differential pressure transmitter
9. Differential pressure transmitter atlas
