Two-wire electromagnetic flowmeter

With the development of China's automation industry in recent decades, domestic instrument and meter manufacturers have sprung up all over China like bamboo shoots after a rain. Take electromagnetic flowmeters as an example. Because of the many different working conditions on site, there are more and more types of electromagnetic flowmeters. According to the different installation methods, there are pipe flange type, plug-in type, clamp installation and other types of electromagnetic flowmeters on the market. What we are discussing today is divided into two-wire electromagnetic flowmeter according to the wiring method.　　 First of all, before explaining the two-wire electromagnetic flowmeter, first define what an electromagnetic flowmeter is.　　Electromagnetic Flowmeters (EMF) is a new type of flow measuring instrument that developed rapidly with the development of electronic technology in the 1950s and 1960s. Electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the flow of conductive fluid based on the electromotive force induced when the conductive fluid passes through an external magnetic field. Because the measurement accuracy is high and the requirements for the measurement medium are not very high, electromagnetic flowmeters are currently widely used in petroleum, chemical, metallurgy, textile, paper, environmental protection, food and other industrial sectors and municipal management, water conservancy construction, and river dredging. Flow measurement in other fields.　　Because electromagnetic flowmeters are widely used, electromagnetic flowmeters can be seen in many occasions. In various industrial sites, there will be power supply to power the electromagnetic flowmeter. And here, there is the difference between the two-wire system and the four-wire system.　　 Two-wire electromagnetic flowmeter-the current temperature, pressure/differential pressure, flow rate and level and other parameters of field instruments tend to output signal and power supply common wire two-wire instrument development. The two-wire system does not require mains power, and the electromagnetic flowmeter is often installed in remote places without mains supply. The use of two-wire system can save the cost of mains wiring engineering. The design concept of the power supply of the two-wire electromagnetic flowmeter is divided into zero signal output current (ie 4mA) supply, greater than zero signal output supply and battery (or solar cell) supply. Battery-powered electromagnetic flowmeters and electromagnetic water meters are suitable for deployment in places far away from urban distribution pools or discharge points after sewage treatment in the suburbs where it is difficult to introduce city power. The battery life of some models is 1-2 years, and some are as long as 8-10 years. Four-wire electromagnetic flowmeter——The four-wire system is that the output signal line and power line (or the excitation wire between the flow sensor and the sensor) of the traditional electromagnetic flowmeter are respectively composed of two groups of four-wire systems with two wires each, which is the current The main system.　　 In summary, electromagnetic flowmeters are mainly divided into two-wire and four-wire systems. The editor reminds you that before buying an electromagnetic flowmeter, you must first confirm the working conditions on site, to see if you need a two-wire electromagnetic flowmeter or a four-wire electromagnetic flowmeter, otherwise, the follow-up after-sales problems will make you unhappy. Therefore, it can be seen from here how important an experienced selection engineer is to us. It is recommended that when purchasing electromagnetic flowmeters, you must look for companies with a large number of customers and large-scale enterprises. For example, the domestic electromagnetic flowmeter manufacturer-Kaidi Sensing.

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