Small diameter electromagnetic flowmeter

The intelligent electromagnetic flowmeter is a fully intelligent electromagnetic flowmeter developed using advanced technology both domestically and internationally. Its all Chinese electromagnetic converter core adopts a high-speed central processing unit. The calculation speed is very fast, the accuracy is high, and the measurement performance is reliable. The converter circuit design adopts international advanced technology, with an input impedance of up to10¹⁵Ohm, with a common mode rejection ratio superior to100db， The ability to suppress external interference and 60Hz/50Hz interference is better than 90db, and it can measure the flow rate of fluid media with lower conductivity. The sensor adopts non-uniform magnetic field technology and a special magnetic circuit structure, which makes the magnetic field stable and reliable, and greatly reduces the volume, reduces repetition, and makes the flowmeter small and flow oriented. Our company's mission is to provide customers with peace of mind when buying, worry free when using, and satisfactory service.

Product Features:

There are no movable parts or flow blocking components inside the pipeline, and there is almost no additional pressure loss during measurement.

The measurement results are independent of physical parameters such as flow velocity distribution, fluid pressure, temperature, density, viscosity, etc.

▲ The range can be modified online according to the actual needs of the user on site.

▲ High definition backlit LCD display, fully Chinese menu operation, easy to use, simple to operate, easy to learn and understand.

▲ Adopting SMD devices and surface mount technology (SMT circuits have high reliability).

Adopting a 16 bit embedded microprocessor, it has fast computing speed, high accuracy, programmable low-frequency rectangular wave excitation, improved stability of flow measurement, and low power consumption.

▲ All digital processing, strong anti-interference ability, reliable measurement, high accuracy, flow measurement range can reach 150:1

▲ Ultra low EMI switching power supply, with a wide range of power supply voltage changes and good EMC resistance

▲ There are three integrators inside that can display the forward cumulative amount and the difference cumulative amount respectively. There is also a non power down clock inside that can record 16 power down times

▲ It has digital communication signal outputs such as RS485, RS232, Hart, and Modbus.

▲ Possess self inspection and self discussion skills

1 Overview

working principle

The measurement principle of an ammeter is based on Faraday's law of electromagnetic induction. The measuring tube of the flowmeter is a non-magnetic alloy short tube lined with insulating material. Two electrodes are fixed on the measuring tube by passing through the tube wall along the diameter direction. The electrode tip is basically flush with the inner surface of the lining. When the excitation coil is excited by two pulse waves, a magnetic flux density of will be generated in the direction perpendicular to the axis of the measuring tubeB's working magnetic field. At this point, if a fluid with a certain conductivity flows through the measuring tube. Induce an electromotive force E by cutting the magnetic field lines. The electromotive force E is proportional to the magnetic flux density B. Measure the product of the inner diameter d of the tube and the average flow velocity v. The electromotive force E (flow signal) is detected by the electrode and sent to the converter through a cable. After amplifying and processing the flow signal, the converter can display the fluid flow rate and output signals such as pulses and analog currents for flow control and regulation.

E=KBdv

In the formula: E---------------Signal voltage between electrodes（v）

B - ----------------- Magnetic flux density (T)

D --------------------------------------------------------------

V ---------------- Average flow velocity (m/s)

in the formulak. D is a constant, and since the excitation current is constant, B is also a constant. Therefore, E= KBdv knows that the volumetric flow rate Q is directly proportional to the signal voltage E -, that is, the signal voltage E induced by flow velocity is linearly related to the volumetric flow rate Q. Therefore, as long as E is measured, the flow rate Q can be determined, which is the basic working principle of electromagnetic flow meters.

fromE=KBdv indicates that parameters such as temperature, density, pressure, conductivity, and liquid-solid composition ratio of the measured flow medium will not affect the measurement results. As for the flow state, as long as it conforms to axisymmetric flow (such as laminar or turbulent flow), it will not affect the measurement results. Therefore, electromagnetic flowmeter is a true volumetric flowmeter. For manufacturers and users, the volumetric flow rate of any other conductive fluid medium can be measured without any correction as long as it is calibrated with ordinary water. This is a prominent advantage of electromagnetic flow meters, which is not found in any other flow meter. There are no active or obstructed components inside the measuring tube, so there is almost no pressure loss and high reliability.

Application field

Due to its unique advantages, electromagnetic flowmeters are widely used in various industrial fields such as chemical fiber, food, papermaking, sugar production, mining and metallurgy, water supply and drainage, environmental protection, water conservancy and hydraulic engineering, steel, petroleum, pharmaceuticals, etc. They are used to measure the volume flow rate of conductive liquid media such as acids, alkalis, salt solutions, mud, slurry, pulp, coal water slurry, corn slurry, fiber slurry, grain slurry, lime milk, sewage, cooling raw water, water supply and drainage, saltwater, hydrogen peroxide, beer, wort, various beverages, black liquor, green liquid, etc

2 Main technical parameters

Common medium conductivity meter