Measuring principle of commonly used flowmeter instruments

Abstract: The information on the measurement principle of the commonly used flowmeter instruments is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Instruments that measure the speed of water flow in water bodies such as rivers, lakes, and channels. There are three types: mechanical, electrical and ultrasonic. The mechanical type is mainly rotor type, and there are propeller type and rotary cup type flow meter. The electrical measuring type has an electromagnetic flowmeter. Ultrasound type time difference and Doppler. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the measurement principle of the commonly used flowmeter instruments. Instruments that measure the speed of water flow in water bodies such as rivers, lakes, and channels. There are three types: mechanical, electrical and ultrasonic. The mechanical type is mainly rotor type, and there are propeller type and rotary cup type flow meter. The electrical measuring type has an electromagnetic flowmeter. Ultrasonic time difference and Doppler flow meter. The flow meter is generally suitable for the average flow velocity during the fixed-point measurement period. The instantaneous flow velocity can be measured by a magnetic flowmeter or a rotor-type flowmeter with multiple signals at one turn, and it can also be used for speed measurement by moving boats. The speed measurement range of the instrument is generally 0.03 to 5.00 m/s, and the applicable water depth is generally 0.2 to 20 meters. In 1790, German R. Walterman made a rotor-type flowmeter for flow measurement. The rotary cup type and propeller type flowmeters manufactured and used in China in the 1950s and 1960s have the characteristics of good waterproof and sandproof performance. The development direction of flow meter is non-rotor electrical measurement technology, optical technology, ultrasonic technology and telemetry technology. (See color picture) The propeller type current meter is mainly composed of three parts: the propeller, the frame and the tail. The propeller is equipped with signal contacts and bearing shafts, etc., China '25-1 type”The rotating shaft system of the propeller flow meter has a tortuous labyrinth structure, which is filled with light oil, which has good waterproof and sand-proof performance, and can be used in high-speed and sandy rivers. The propeller-type flowmeter, the rotary-cup flowmeter and the rotary-vane flowmeter are all rotor-type flowmeters, and the working principle is basically the same. The formula is: whereυis the flow rate; N is the total number of revolutions in the period; t is the duration of the period; c is a constant, reflecting the frictional resistance when the rotor rotates; the K value depends on the blade pitch or cup shape. K and c values ​​are all tested in a special water tank. In the case of low speed, due to the great influence of the c value, the flow velocity formula is a curve function, and the above formula is no longer used. The number of revolutions is displayed by a counter. The simplest counters are small lamps, bells and transistor speakers. Every time the propeller rotates 20 times, the switch is turned on once, the electric light flashes or the sound is counted manually, and the stop watch is used for timing. The more perfect ones include electric counters, electronic counters, timing counters and direct-reading flow rate displays. These counters can be used for A current meter with many signals per rotation of the propeller can improve the speed measurement accuracy. The principle of the electromagnetic flowmeter is to use the water flow as a conductor to cut the magnetic field lines in a certain magnetic field, that is, to generate an electromotive force, and its voltage is proportional to the flow rate. The instrument has no rotor, smooth appearance, small volume and low power consumption. There is an excitation coil in the body cavity, and a pair of electrodes are embedded in the direction perpendicular to the magnetic field line on the surface to communicate with the water body. When the water flows on its surface, a trace voltage signal is generated on the electrode, which is transmitted to the counter with a wire, and the flow rate can be directly displayed after circuit processing such as amplification and analog-to-digital conversion. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Measuring Principles of Commonly Used Velocity Meters'

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