Introduction of electromagnetic flowmeter Electromagnetic flowmeter is the finalized product of Huaneng Automation Instrument Co., Ltd. The measuring principle of the electromagnetic flowmeter is programmed according to Faraday's electromagnetic law, digital excitation is realized by embedded technology of single chip microcomputer, and it can also be equipped with 4-20MA current output signal for recording or mediation. The main components of the sensor are: measuring tube, electrode, excitation coil, iron core and shell. HNLD electromagnetic flowmeter is mainly used to measure the volume flow of conductive liquid and liquid in closed pipeline, including acidic liquid, alkaline liquid and salty liquid, and is widely used in chemical industry, petroleum, textile, papermaking, metallurgy, pharmacy and water treatment, environmental protection, municipal management, water conservancy construction and other industrial fields. Orifice flowmeter is the finalized product of Jiangsu Huaneng Automation Instrument Co., Ltd. Orifice flowmeter is a newly developed pressure difference generating device, in which throttling device includes orifice valve core and nozzle. It can measure the flow of various fluids in the pipeline with differential pressure transmitter or pressure transmitter, three-valve resistor and condenser. The measurable media are liquid, gas and steam, which are widely used in petroleum, chemical industry, metallurgy, light industry, coal mine and other industrial sectors.