Integrated electromagnetic flowmeter

I. Product description

LD type electromagnetic flowmeter is in accordance with the standard JB/T9248-1999 electromagnetic flowmeter, which is an inductive instrument for measuring the volume flow rate of conductive medium. It can output standard current signal for recording, adjustment and control at the same time of field monitoring and display, so as to realize automatic detection control and long-distance transmission of signals. It can be widely used in water supply, chemical industry, coal, environmental protection, light textile, metallurgy, papermaking and other industries in the flow measurement of conductive liquid. It has obtained the explosion-proof certificate issued by the National Explosion-proof electrical product Quality Inspection Center. The explosion-proof mark is Exd11CT6, which is suitable for liquid measurement in various explosive environments. The mounting form of the instrument has one body type and part body type.

Ii. Product features

★ No moving parts in the measuring tube, easy to maintain and manage; Open flow components, so no pressure loss.

★ The minimum conductivity of the measured liquid ≥5 s/cm, with various lining materials, suitable for measuring the flow of various acid, alkali, salt solutions and mud, pulp, pulp and other media.

★ Flow measurement is not affected by the fluid density, viscosity, temperature, pressure and conductivity changes, sensor induced voltage signal and the average flow rate is linear, high measurement accuracy.

Reasonable selection of lining and electrode materials can achieve good corrosion resistance and wear resistance.

★ Low-frequency rectangular wave excitation, not affected by power frequency and all kinds of field stray interference, stable and reliable work.

★ The range is 1.120 (0.1m/s-12m/s), and the flow velocity range of the full range is wide.

Liquid crystal backlight display, online parameter modification, simple and convenient operation.

★ Air control measurement, alarm function, and can adapt to different fluid media.

★ Power off time recording function, automatic recording instrument system power supply interruption time, compensate for leakage meter flow.

★ Hourly total recording function, record the total flow in hours, applicable to time-sharing measurement system.

Iii. Measurement principle

The electromagnetic flowmeter is based on The principle of Faraday's law of electromagnetic induction, that is, conducting objects in the magnetic field

An induced electromotive force is generated in the conductor during the motion of the cutting magnetic sensing line. Its induced electromotive force E is:

E=KBdV flow Q is: Q=3600×V ×S

Where: K- instrument coefficient

B- Magnetic induction intensity (T)

D - Electrode spacing (m)

V- Average flow rate (m/s)

S-in-duct cross-sectional area (m2)

When measuring the flow rate, the conductive liquid flows through the magnetic field perpendicular to the flow direction at the velocity V. The flow of the conductive liquid induces a voltage proportional to the average flow rate, and the induced voltage signal is detected through the electrode in direct contact with the liquid. For the same flow meter S, B, and D are constants, so the flow rate is proportional to the magnitude of the induced electromotive force E (or flow rate V).

Vi.Product selection