Magnetic flowmeter

Product Overview

The Electromagnetic Flowmeter is primarily used to measure the volumetric flow rate of conductive liquids or liquid-solid two-phase fluids in continuous or intermittent flows through closed pipelines. Its measurement accuracy is not affected by changes in the temperature, density, viscosity, and conductivity (＞5us/cm) of the measured medium. By selecting appropriate electrode and lining materials, it can measure the flow rate of various corrosive liquids and highly abrasive slurries. This product is widely used in the fields of petroleum, chemical engineering, metallurgy, light textile industry, pharmaceuticals, papermaking, power, and environmental protection.

Working Principle

The measurement principle is based on Faraday's Law of Electromagnetic Induction (see figure).

An alternating external magnetic field is set up on the outside of the measuring tube of the sensor, and a pair of electrodes are installed on both sides perpendicular to the direction of the magnetic flux lines. When the conductive medium flows through the measuring tube and cuts across the magnetic flux lines, an induced electromotive force (emf) E is generated in the electrodes. The induced emf E has the following relationship:

E=K⋅B⋅V⋅D

Where:

E is the induced electromotive force (emf),

K is the instrument constant,

B is the magnetic flux density.

Equipment Composition

The electromagnetic flowmeter consists of a flow sensor and a transmitter, equipped with various standard output signal interfaces.

Key Features and Competitive Edges

• No obstructions inside the measuring tube, resulting in almost zero pressure drop.  
• Corrosion-resistant and wear-resistant.  
• High measurement accuracy, stable and reliable operation.  
• Strong interference resistance, wide measurement range.  
• Multiple standard interfaces: 4 to 20mA current output, pulse output, alarm output, RS-485 communication, etc.

Technical Specifications

• Nominal Diameter, mm: DN15 to DN600.  
• Nominal Pressure, MPa: 1.0, 1.6, 2.5, 4.0, 16, 25, 32, 42.  
• Electrode Materials: 304 Stainless Steel, 316L Stainless Steel, Titanium, Tantalum.  
• Lining Materials: Polytetrafluoroethylene (PTFE), Perfluoroalkoxy (PFA), Polyurethane Rubber, Neoprene Rubber.
• Accuracy: Class 0.5, Class 1.0.  
• Output Signal: Standard two-wire 4 to 20mA current output, pulse output.  
• Communication Interface: RS-485, RS-232C, MODBUS, REMOTE (HART).  
• Power Supply: 24VDC, 220VAC.  
• Power Consumption, W: AC < 10, DC < 7.5.  
• Applicable Medium Temperature, °C: -25 to 65, -25 to 140 (optional).  
• Flow Range