The HUALIU HL-LDE series smart electromagnetic flowmeter is a velocity-type flow instrument for measuring the volumetric flow of conductive liquids. It is widely used for measuring various acid, alkali and salt solutions as well as conductive liquids or liquid-solid two-phase media such as pulp and slurry. The meter can be combined with display, recording, totalizing and regulating equipment to achieve flow detection, totalizing, regulation and control, and is widely applied in the chemical, mining and metallurgy, water supply and drainage, sewage treatment, food, papermaking, sugar refining and port dredging industries. The product is not suitable for measuring non-conductive liquids, gases or steam.

Its operating principle is based on Faraday's law of electromagnetic induction: when a conductive fluid flows at an average velocity through an insulated measuring tube placed in a uniform magnetic field, an induced electromotive force proportional to the flow velocity is generated across a pair of electrodes perpendicular to both the magnetic field and the flow direction, from which the volumetric flow is linearly derived. The measuring accuracy is unaffected by variations in fluid density, viscosity, temperature, pressure or conductivity. There are no flow obstructions or moving parts inside the measuring tube, giving low pressure loss, low straight-pipe requirements and long sensor life, with the required upstream straight run being only 5 times the pipe diameter.

The HUALIU electromagnetic flowmeter employs programmable low-frequency square-wave excitation and a 16-bit embedded microprocessor for fully digital signal processing, providing strong anti-interference capability, stable and reliable measurement, and a flow rangeability up to 50:1. The meter features a wide-temperature backlit LCD with a full Chinese-character menu display for intuitive and convenient operation. Its proprietary 4-6 multi-electrode structure ensures measuring accuracy without the need for grounding rings. Nominal bores cover DN6 to DN3000, with a variety of lining and electrode materials, and multiple outputs and communications including 4-20mA, frequency/pulse, MODBUS and HART, meeting the metering needs of diverse operating conditions.