Commonly used type current meter instrument measuring principle

Abstract: the common type current meter instrument measuring principle of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Measurement of rivers, lakes and channels and so on water flow speed of the instrument. There are three types of mechanical, electrical and ultrasonic measurement. Mechanical type is given priority to with rotor type, a propeller type and cup type current meter. Electrical measuring type electromagnetic flow meter. Have a time difference method and doppler ultrasonic type. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a commonly used type current meter instrument measuring principle, the article details. Measurement of rivers, lakes and channels and so on water flow speed of the instrument. There are three types of mechanical, electrical and ultrasonic measurement. Mechanical type is given priority to with rotor type, a propeller type and cup type current meter. Electrical measuring type electromagnetic flow meter. Type ultrasonic has time difference method and the method of doppler current meter. Current meter is generally applicable to designated time average flow velocity measurement. By the magnetic type current meter or more than one turn signals of rotor type current meter can measure the instantaneous velocity, also can be used as a method of moving ship speed. Instrument speed range is commonly 0. 3 ~ 5. 00 m/s, is generally applied water depth of 0. 2 ~ 20 meters. 1790 R. Walter, made the rotor type current meter, used for velocity measurement. China 50 ~ 60 s of the 20th century made use of rotary cup type and a propeller type current meter, waterproof, prevent the characteristics of good performance. The development direction of current meter is rotor electrical measuring technology, optical technology, ultrasonic technology and remote sensing technology. （ See image) The propeller type current meter is mainly composed of propeller, these characteristic and the tail of three parts. Propeller is equipped with the signal contact and bearing shaft, etc. , China '25 Type 1 & throughout; Propeller shaft system of current meter has a tortuous maze structure, internal full of light oil, and has good waterproof, prevent performance, can be used in high velocity and sand river. Propeller type current meter, cup type current meter and rotary vane rotor type current meter, current meter have the same working principle, is the use of flow dynamics drive the rotor rotation, according to the calculated velocity rotational speed. Formula is: type of & upsilon; For the velocity; N for the period of the revolution; T is time duration; For the constant c, reflect the rotor rotates friction resistance; K value depends on the blade pitch or cup. K, c values are in a special tank test. Under the condition of low speed due to the c value is larger, the influence of velocity curve function relation, no longer use type. Revolutions in counter displays, zui simple counter is little electric light, the sound of the bell and the transistor. Propeller every 20 laps, the switch, the lights flash of light or sound, by artificial count, stop watch time, more perfect electric count table, electronic counter and time counter and direct reading speed display, etc. , these counters can be used in the propeller has many signal current meter each roll 1 circle, can improve the speed measuring precision. Electromagnetic current meter principle is to put the water as a conductor, in certain cutting lines of magnetic force in magnetic field, which produces electromotive force, the voltage is proportional to the velocity. Instrument without rotor, smooth appearance, small size, low power consumption, in the body cavity excitation coil, on the surface in a direction perpendicular to the magnetic field lines with a pair of electrodes and water body are interlinked. When the water on its surface flow, electrode produce trace voltage signal, with a wire transfer to the counter, and modulus conversion circuit, such as enlargement, can directly show the velocity. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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