KEYILE科译勒 K-EF Electromagnetic Flowmeter

Instrument Feature

• • Measurements are unaffected by changes in fluid density, viscosity, temperature, pressure, and electrical conductivity;
  • The measuring tube contains no flow-restricting components, resulting in no pressure loss and low straight pipe requirements, making it uniquely suited for slurry measurements；
  • Nominal diameter range from DN6 to DN3000,with multiple Options for linings and electrodes, suitable for various measurement media, and excellent corrosion and water resistance；
  • The converter uses programmable low-frequency rectangular wave excitation, enhancing measurement stability and minimizing power loss;
  • The converter uses a 32-bit embedded microprocessor for fully digital processing, offering fast computation speed, strong anti -interference capability, reliable measurement, high accuracy, and a flow measurement range ratio of up to 1500:1, with the ability to modify the measurement range online according to user requirements;
  • High-resolution backlit LCD display with optional Chinese or English menu operation, easy to use, simple to operate, and intuitive;
  • Supports digital communication signal outputs such as RS485, RS232, Hart, and Profibus (optional);
  • Features conductivity measurement functionality to detect whether the sensor is empty, with self-testing and self-diagnosis capabilities;
  • Utilizes SMD components and surface mount technology (SMT) for high circuit reliability;
  • Infrared handheld controller operation with a communication rate of 115 kHz, enabling remote non-contact operation of all converter functions (optional);
  • Internal three meters display forward cumulative, reverse cumulative, and differential cumulative quantities separately. An internal power-off clock records the power-off time (optional);
  • Suitable for use in corresponding explosion-proof environments.

Application Field

	Iron & Steel Metallurgy Petroleum & Chemical Wastewater Treatment Water Conservancy & Irrigation Water Supply & Drainage Food Processing Paper Industry Pharmaceutical Industry
	Electromagnetic flowmeters can be used to measure the volume flow of conductive fluids in closed pipes, and can also be used to measure the volume flow of corrosive liquids such as strong acids and alkalis, and uniform liquid-solid mixed liquids such as mud, ore pulp, and paper pulp. They are widely used in flow measurement and control in industrial and agricultural production processes such as petrochemicals, steel metallurgy, water supply and drainage, water conservancy irrigation, water treatment, environmental sewage measurement and control, papermaking, medicine, and food.

Working Principle

	The working principle of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction, as shown in Figure 1. When a conductor moves in a magnetic field, an induced electromotive force (E) will be generated at bothn ends of the conductor in a direction perpendicular to the magnetic field and the direction of movement. This induced electromotive force is detected by two measuring electrodes, and its value is proportional to the flow rate and the magnetic induction intensity of the magnetic field. Its value is: E=B.V.D.K In the formula: K-coefficient related to magnetic field distribution and axial length        B-magneticinductionintensity        V-average flow rate of conductiveliquid        D-electrode spacing (diameterinsidethe measuringtube) Fig. 1 Schematic of Pipeline Electromagnetic Flowmeter
	The working principle of the insertion electromagnetic flowmeter is the same as that of the pipe-mounted electromagnetic flowmeter, both based on Faraday's law of electromagnetic induction, as shown in Figure 2. When a conductive liquid flows at an average velocity V perpendicular to the magnetic field lines with a magnetic field strength of B between two electrodes separated by a distance L, an induced electromotive force (E) is generated between the electrodes. The formula is: E = B × L × V In the formula:        B: Magnetic flux density of the excitation coil        V: Average flow velocity        L: Distance between the two electrodes (24 mm for this device)        Q: Volume flow rate of the measured fluid Figure 2 Schematic diagram of pipeline electromagnetic flowmeter
	The electromagnetic flowmeter converter provides a stable excitation current to the electromagnetic flow sensor excitation coil. The preamplifier amplifies the electromotive force induced by the sensor and converts it into a standard current signal or frequency signal, which is convenient for displaying, controlling and adjusting the flow. The following figure 3 shows the converter circuit st ructure.

Product Line
                                                                                                                                                                                                                                  

standard form Stainless steel type split-type Integrated plug-in type

Performance parameters