Insertion electromagnetic flowmeter

Insertion electromagnetic flowmeter

Overview

Plug in flowmeter is a kind of flowmeter divided according to its structure, which includes various flowmeters with different working principles. Insertion electromagnetic flowmeter has made great progress, and from the development trend of the whole flowmeter, it has strong vitality and occupies an important position in many flowmeters.
Flowmeter is the most popular and extensive classification method according to measurement method and classification. Flowmeter is divided into: volumetric flowmeter, differential pressure flowmeter
There are 11 catagories of rotameter, turbine flowmeter, electromagnetic flowmeter, fluid oscillation flowmeter, mass flowmeter, plug-in flowmeter, open channel flowmeter, probe flowmeter, ultrasonic flowmeter and other flowmeters (including laser flowmeter, target flowmeter, impulse flowmeter and marking flowmeter).
There are many forms of plug-in flowmeter that have been widely used. According to the working principle of the detection head of plug-in flowmeter, it can be divided into plug-in turbine, plug-in vortex street, plug-in electromagnetic, averaging tube and thermal flowmeter; According to the measuring points of plug-in flowmeter, it can be divided into point flow type and radial flow type.

Working principle of Insertion electromagnetic flowmeter
The working principle of plug-in electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. In the electromagnetic flowmeter, the conductive medium in the measuring tube is equivalent to the conductive metal rod in Faraday test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field. When a conductive medium flows through, an induced voltage will be generated. Two electrodes inside the pipe measure the induced voltage generated. The measuring pipe is electromagnetically isolated from the fluid and the measuring electrode through a non-conductive lining (rubber, Teflon, etc.).

Features
● low frequency ternary rectangular wave constant current excitation is not affected by power frequency and various stray interference on site, and the work is very stable and reliable.
● with the new technology of non-uniform magnetic field and special magnetic dance structure, the magnetic field is stable, and the volume and weight are greatly reduced, making the flowmeter small and lightweight
● special electronic circuit is adopted, with the function of automatic zeroing of air traffic control.
● on site, the range can be modified online according to the actual needs of users.
● there are no movable parts and flow blocking parts. There is almost no additional pressure loss in the measurement.
● the measurement results are independent of physical parameters such as flow velocity distribution, liquid pressure, temperature, density and viscosity
● easy to use. After installation, you only need to connect the power supply without any other operation to output standard signals, which is convenient for non professionals

Main tech data
(1) The instrument characteristics are greatly affected by the fluid flow characteristics, especially the point flow plug-in flowmeter, which has high requirements for the length of on-site straight pipe section;
(2) The measurement accuracy of the instrument is generally low, which is only applicable to the flow measurement and control in the modern industrial process detection and control system, but not applicable to the trade accounting, total quantity measurement and product handover of expensive fluids, especially the point flow plug-in flowmeter calibrated by the flow meter method;
(3) Instrument standardization is difficult.