Common several kinds of the working principle and application of meter is introduced

Abstract: the working principles and applications of several common flow meter and information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Differential pressure flowmeter differential pressure flowmeter is a kind of widely used flow measurement instruments, accounts for about 70% of the total number of the flow measurement instrument. It is composed of the throttle device and differential pressure transmitter. When filled with circular tube of fluid flow through the throttle parts ( Such as orifice plate) , the flow in the orifice plate beam forming local contraction. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the working principle and application of several common flowmeter introduction for details. Differential pressure flowmeter differential pressure flowmeter is a kind of widely used flow measurement instruments, accounts for about 70% of the total number of the flow measurement instrument. It is composed of the throttle device and differential pressure transmitter. When filled with circular tube of fluid flow through the throttle parts ( Such as orifice plate) , the flow in the orifice plate beam forming local contraction. Due to the increase of flow velocity and static pressure is reduced, before and after the orifice produces a differential pressure, the pressure differential is directly proportional to the square of the velocity. Orifice meter, also known as differential pressure flowmeter, consists of a main detection ( The throttle) And an auxiliary device ( Differential pressure transmitter and flow totalizer) For measuring gas, steam and liquid flow. It has simple structure, convenient maintenance, the characteristics of stable performance and reliable in use. Throttling orifice throttling device is a kind of standard throttling components, according to the following national standards for production directly, without calibration. (1) the flow measurement in the national standard GB 2622006 throttling device design, installation and use. (2) the IS0 5167 international standard of throttling device. (3) ministry of chemical industry standard GJ - 5187 g HK06。 Fills the throttle device in the fluid flows through the pipe in the pipe, cause the throttling element near the local contraction, increase the flow velocity and from static pressure difference between upstream and downstream side ( See figure 1) 。 Figure 1 when the fluid flows through the throttle device changes in pressure and flow rate under the condition of the known parameters, according to the principle of flow continuity and Bernoulli's equation, can be deduced the relationship between differential pressure and flow rate, flow is obtained. The p is the pressure difference before and after the throttle device, q is the instantaneous flow rate. Due to the nature of the fluid, the throttle device of the relationship between the differential pressure and flow rate is the relationship between the square root and the square root. At present, several kinds of typical flow measurement equipment is widely used, such as electromagnetic flowmeter, vortex flowmeter, ultrasonic flowmeter, etc. Electromagnetic flowmeter electromagnetic flowmeter is the fifties and sixties of the 20th century has been developed rapidly with the development of electronic technology and a new type of flow measurement instrument. Electromagnetic flowmeter is made according to Faraday's law of electromagnetic induction, is used to measure the volume flow of conducting liquid. Electromagnetic flow meter because of its unique advantages, has been widely used in various industrial process of conductive liquid flow measurement, such as acid, alkali, salt and other corrosive medium. Electromagnetic flowmeter of mud flow measurement has formed unique applications. On the structure, electromagnetic flow meter is composed of electromagnetic flow sensor and converter. Sensor installed on the industrial process piping, its function is to flow into the pipe of liquid volume flow value is converted into linear induction electric potential signal, and through the signal is sent to the converter transmission line. Converter is installed in place not far away from the sensor, it enlarged traffic signal from the sensor, and transform it into a standard electrical signal proportional to the traffic signal, is used to display, accumulated and adjusting control. Figure 2, the basic principle of the electromagnetic flowmeter measurement principle of measurement of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. Flowmeter measurement tube is lined with insulating material short non-magnetic alloy pipe. Two electrodes along diameter direction through the wall and fixed on the measuring tube. Basically flush with lining the inner surface of the electrode tip. When the drive coil is two wave pulse excitation, in the direction perpendicular to the axis of the measuring tube will produce magnetic field magnetic flux density of b's work. At this point, if a certain electrical conductivity of the fluid flow through the measuring tube, cutting lines of magnetic force will be induced electromotive force e. Electromotive force and the magnetic flux density b e, measuring pipe diameter d and average flow velocity is directly proportional to the product of the u. 。 Electromotive force e ( Traffic signals) By the electrode, and through the cable sent to the converter. Converter after amplification traffic signal, can display the fluid flow, and the output pulse and analog current signal flow control and regulation, etc. E = signal voltage between electrodes, using E = KBdu formula, said v. K is the coefficient; B is the magnetic flux density, t; D is the inner diameter of the measuring tube, m; U is the average flow velocity, m/s; In this formula, k and d is constant, because the exciting current is constant, b is constant. Can know from E = KBdu, volume flow rate Q and E is proportional to the signal voltage, i. e. , caused by a traffic signal voltage E and a linear relationship with the volume flow rate Q. 。 Therefore, as long as the measurement of e, can determine the flow rate q, this is the basic working principle of electromagnetic flowmeter. By E = KBdu, liquid - Solid two phase fluid temperature, density, pressure, conductivity and fluid Solid composition than does not affect the measurement result. As to the flow state, as long as meet axisymmetric flow ( Such as laminar or turbulent) , will not affect the measurement result. Therefore, the volume of electromagnetic flowmeter is a kind of real flow meter. For manufacturers and users, any other conductive fluid volume flow only after the actual calibration with ordinary water can measure, without any correction. This is a prominent advantages of electromagnetic flowmeter, no any other flowmeter.

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