Measurement unitThe core components are the measuring tube, electrode, and lining. The measuring tube is made of stainless steel or carbon steel material, and the inner wall is lined with insulating materials (such as PTFE, natural rubber, ceramics), which not only prevent the interference of liquid and metal tube wall conductivity in measurement, but also resist medium corrosion; The electrodes are installed on both sides of the inner wall of the measuring tube, in direct contact with the fluid, for collecting induced electromotive force. Common materials include 316L stainless steel, Hastelloy C276, titanium alloy, etc., which can be flexibly selected according to the corrosiveness of the medium; The lining material is selected based on the characteristics of the medium and the operating temperature and pressure. For example, PTFE lining is suitable for strong acid and alkali, high temperature (≤ 180 ℃) scenarios, while ceramic lining is suitable for high wear slurry and sediment media.

Excitation unitComposed of an excitation coil and an excitation power supply, it is used to generate a uniform and stable magnetic field inside the measuring tube. The excitation coil is wound with high-strength enameled wire and has a shielding layer between it and the measuring tube, which can reduce the interference of magnetic field leakage on surrounding equipment; The excitation power supply can provide stable excitation current and output DC, AC or low-frequency square wave excitation signals according to the working conditions. DC excitation is suitable for low polarization media, while AC and low-frequency square wave excitation can effectively eliminate electrode polarization and external interference, and are currently the mainstream excitation methods.

signal processing unitIncluding signal amplification circuit, filtering circuit, and A/D conversion circuit. The induced electromotive force collected by electrodes is usually in the range of several millivolts or even microvolts, and the signal amplification circuit can amplify weak signals to a manageable range; The filtering circuit eliminates noise signals such as pipeline vibration and electromagnetic interference through digital filtering algorithms; The A/D conversion circuit converts analog signals into digital signals and transmits them to the intelligent control unit for processing.

Intelligent control unitUsing a microprocessor (MCU) as the core, integrating components such as display screens, buttons, communication interfaces, relay output interfaces, etc., it is the "brain" of the device. The microprocessor is responsible for receiving digital signals, converting flow data through built-in algorithms, and controlling the display screen to display information; At the same time, it can process external instructions (such as remote parameter modification), control relay output alarms or control signals, and achieve automation functions; The communication interface provides a channel for data transmission, ensuring the interconnection between devices and external systems.

Traffic calculation algorithmAccording to Faraday's law of electromagnetic induction, the induced electromotive force collected by the electrode is converted into flow velocity, and then combined with the cross-sectional area of the measuring tube to calculate the volumetric flow rate, ensuring the accuracy of the calculation results.

Digital filtering algorithmBy using algorithms such as Kalman filtering and sliding average filtering, external electromagnetic interference and noise signals generated by pipeline vibration are eliminated to ensure the stability of the original data.

compensation algorithmRegarding the fluid density affected by the thermal expansion and contraction of the measuring tube and pressure changes caused by the temperature changes of the medium, relevant parameters are collected through temperature sensors and pressure sensors, and the compensation formula is used to correct the flow data, further improving the measurement accuracy.

Communication protocol stackIntegrate communication protocols such as Modbus RTU, HART, Profinet, etc. to achieve standardized data exchange between devices and external systems, ensuring communication stability and compatibility.

Fault diagnosis algorithmReal time monitoring of parameters such as electrode impedance, excitation current, and flow signal fluctuations. When abnormalities are detected (such as electrode scaling, excitation coil open circuit, or empty tube operation), a fault alarm is triggered and a fault code is output through a display screen or communication signal to help operation and maintenance personnel quickly troubleshoot the problem.

Pipeline electromagnetic flowmeterThe most common type is directly installed on pipelines, suitable for scenarios with full pipe operation, high measurement accuracy, and adaptable to the vast majority of industrial fluid measurement needs, such as chemical pipelines, water treatment pipelines, metallurgical circulating water systems, etc.

Plug in electromagnetic flowmeterBy inserting a measuring probe through a hole in the pipeline, flow measurement can be achieved without cutting off the pipeline. It is easy to install and suitable for large-diameter pipelines (such as municipal water supply networks with a diameter of DN1000 or more) or scenarios where installation cannot be stopped. Compared to the pipeline type, the insertion type measurement accuracy is slightly lower (usually ± 1.0%~± 1.5% FS), but the installation cost is lower and maintenance is more convenient.

Integrated electromagnetic flowmeterThe measurement unit and intelligent control unit are integrated together, with a compact structure and small installation space, suitable for scenarios with small and medium-sized diameters (≤ DN300) and limited installation space, such as process pipelines in workshops.

Split type electromagnetic flowmeterThe measurement unit and intelligent control unit are separated and connected by cables (up to 100 meters in length), suitable for large-diameter pipelines (≥ DN300), high-temperature environments (such as boiler feedwater pipelines), or highly corrosive scenarios. Installing the intelligent control unit in a safe area away from the measurement point can avoid damage to electronic components caused by high temperature and corrosion.

Ordinary electromagnetic flowmeterNo explosion-proof design, suitable for environments with no explosion risk, such as non explosion-proof areas in ordinary water plants and food processing plants.

Explosion proof electromagnetic flowmeterEquipped with explosion-proof shell and explosion-proof circuit design, it is suitable for scenarios such as chemical, petroleum, pharmaceutical, etc. where flammable and explosive gases or dust exist. According to the explosion-proof level, it can be divided into explosion-proof type (Exd IIB T4) and intrinsic safety type (Exia IIC T6), with intrinsic safety type having a higher explosion-proof level and suitable for areas with more severe explosion risks.

Improve production efficiencyThrough precise flow measurement and automated control, enterprises can optimize production process parameters (such as reactor feed rate and circulating water flow rate), avoid production abnormalities caused by flow fluctuations, and improve product qualification rate and production efficiency.

Reduce energy consumption and costsAccurate flow monitoring can help enterprises adjust the operating parameters of fluid conveying equipment (such as pumps and fans) reasonably, avoid overload operation, and reduce energy consumption; At the same time, the equipment has no mechanical wear and tear, a long service life, and reduces maintenance and replacement costs.

Ensure environmental complianceIn industries such as water treatment and chemical engineering,Intelligent electromagnetic flowmeterReal time monitoring of sewage discharge, medium consumption and other data, with data storage and traceability functions meeting the requirements of environmental protection departments for discharge monitoring, helping enterprises avoid environmental penalty risks.

Promote digital transformationThe communication and interconnection capabilities of devices can integrate traffic data into enterprise digital management systems, providing data support for production optimization, energy consumption analysis, and supply chain management, and helping enterprises achieve digital and intelligent transformation.

regular cleaningFor media containing impurities and prone to scaling, it is necessary to regularly disassemble the electrode and clean the dirt or scaling on the surface of the electrode to avoid affecting the collection of induced electromotive force; When cleaning, use a soft cloth or specialized cleaning agent to avoid scratching the electrodes or lining.

parameter checkRegularly check the display screen data and compare it with actual working conditions to determine whether the flow rate is reasonable; Check if the communication is normal and ensure that the data can be uploaded to the upper computer normally; Regularly calibrate the equipment (recommended once every 1-2 years), which can be done through on-site calibration or factory calibration to ensure that the measurement accuracy meets the requirements.

Installation specificationsDuring installation, it is necessary to ensure that the pipeline runs at full capacity and avoid measuring with empty or half pipes; Sufficient straight pipe sections should be reserved upstream and downstream (usually ≥ 5D upstream and ≥ 3D downstream) to reduce the impact of fluid disturbance on measurement; Stay away from strong magnetic field interference sources (such as large transformers and high-voltage cables), and the grounding resistance of the equipment should be ≤ 10 Ω to ensure signal stability.

Adaptation to working conditionsTo avoid operating under excessive temperature and pressure, the operating temperature and pressure should be within the rated range of the equipment, and a margin of 10% to 20% should be reserved; For media containing bubbles, it is necessary to first process them through a degassing device to avoid measurement errors or signal interruptions caused by bubbles.