Electromagnetic flowmeters , with the popularization of computers in the petrochemical instrument automatic control system, have also gradually developed in the direction of digitalization, networking, modeling, and intelligence.
In addition to the development of existing information systems, petrochemical companies also continue to deepen their integrated automation systems, strengthen the application of security control systems, improve their basic automation and advanced control levels, and strengthen their market competitiveness.
The development of instrumentation systems at home and abroad towards digitalization, intelligence, networking, and miniaturization has enabled petrochemical companies to increase the level of application of automatic detection instruments.
In order to meet the requirements of fieldbus control systems, fieldbus transmitters have developed rapidly.
The transmitter is all digital, with simple structure, higher resolution and stability than general intelligent transmitters. As fieldbus digital instrument products become more and more complete, and have the characteristics of high reliability, interoperability (that is, the integration of different brands of products), etc., they will be more applied in the field of petrochemical process control.
The development of commercial trade at home and abroad requires the improvement of measurement accuracy of commodity delivery. The accuracy of mass flowmeters used in petrochemical factory measurement applications is ± 0.1% or higher.
In order to strengthen product quality management, the application of online analytical instruments has also been promoted. It will directly affect the product quality and the level of advanced control applications, so it has been actively promoted, mainly including online oil quality analyzers, online gas or liquid chromatography and other physical property analyzers.
The latest online multi-channel near-infrared (NIR) spectrum analyzer has been applied to the refinery blending system of petrochemical enterprises and achieved good results.
The new-generation laboratory low-cost gasoline quality indicator rapid tester has been successfully used in Sinopec Hangzhou Refinery and other units, and has been well received by users. Soft-sensing technology is also developing rapidly, and it is mainly used to solve some analysis and detection problems of petrochemical enterprises.
Due to the increasing requirements for environmental protection, the application of environmental protection instruments has also increased, such as online flue gas analysis, comprehensive water quality analyzers, online COD analyzers, DO analyzers, and pH analyzers.
At present, there is a great demand for online analytical instruments in petrochemical companies. Compared with foreign products, there is a certain gap between domestic online analytical instruments. Most of the online analytical instruments in use today are imported products.
Petrochemical is paying more and more attention to the maintenance work of the factory, and especially interested in predicting maintenance issues. Some companies require on-line and real-time sensing systems for indicators that monitor the efficiency, vibration, and corrosion of heat exchangers and furnaces, and assess "health" conditions.
The use of instruments and systems with diagnostic and predictive maintenance capabilities can increase the production potential of existing equipment by 1% to 3%, while reducing unplanned maintenance costs by 10% to 30%.
While satisfying the on-site display, the electromagnetic flowmeter can also output 4-20mA current signals for recording, adjustment and control. It has been widely used in chemical industry, environmental protection, metallurgy, medicine, papermaking, water supply and drainage and other industrial technology and management departments .
An electromagnetic flowmeter that uses the principle of electromagnetic induction to measure the flow rate of a medium fluid.
It applies a magnetic field on both sides of the pipe, and the measured medium flows through the pipe to cut the magnetic field lines, which generates induced potentials on the two detection electrodes, the size of which is proportional to the speed of the fluid.
The electromagnetic flowmeter is characterized by no moving parts and parts protruding from the fluid. It has high reliability and can be used to measure acid, alkali, saline solution, coal slurry, mineral slurry, mortar and plaster, paper pulp, resin, The flow rate of various suspended matters, vapors and viscous substances such as rubber latex, synthetic fiber pulp and photosensitive latex.
The electromagnetic flowmeter has good sealing performance and can also be used in tap water and underground water channel systems. And the measurement process is not in contact with the fluid, suitable for the pharmaceutical, biochemical and food industries.
This flow meter also measures blood flow. Its range ratio is about 100: 1, the accuracy is generally 1%, and the high-precision electromagnetic flowmeter can reach 0.1% (mean square error).
Because this sensor must maintain a certain proportional relationship between the resistance in the pipeline and the impedance of the measurement circuit, it is difficult to manufacture. Difficulties begin to occur when the conductivity of the measured medium is about 10 ohm · cm, and principle difficulties arise when the conductivity is lower.
When the electrical conductivity is 10 ohm · cm, the "demarcation line" between the conductive medium and the dielectric is reached, and the thermal noise level increases significantly as the internal resistance increases.
The electromagnetic flowmeter is a high-precision, high-reliability and long-life flow meter. Therefore, we have paid great attention to each link in the process of designing product structure, selecting materials, formulating processes, manufacturing and assembly, and factory testing. China's most advanced production equipment and flow real-time calibration device dedicated to electromagnetic flowmeters can ensure the long-term high quality of the product in terms of software and hardware.
The electromagnetic flowmeter is specially designed with a Chinese LCD display with a wide backlight temperature range. It is complete and practical, intuitive to display, and easy to use, which can reduce the inconvenience caused by the English menus of other electromagnetic flowmeters. In addition, we have designed a multi-electrode structure to further ensure measurement accuracy and no need for a grounding ring at any time, reducing the volume of the meter and the trouble of installation and maintenance.