Electromagnetic flowmeter is used to measure the volumetric flow rate of conductive fluid and slurry in a closed pipeline based on Faraday’s law of electromagnetic induction. It can also measure the flow rate of liquid-solid two-phase flow, high viscosity liquid flow, and corrosive liquids such as salts, strong acids, and strong bases. Electromagnetic flow meters are widely used for flow measurement and control in various industries such as water supply and drainage, water treatment, environmental wastewater measurement and control, petrochemicals, steel metallurgy, water conservancy and irrigation, pharmaceuticals, papermaking, food and other production processes. Large caliber instruments are commonly used in water supply and drainage engineering. Small and medium-sized diameters are commonly used for difficult to measure solid-liquid two-phase fluids or in high demand environments. Small caliber and micro caliber are commonly used in places with hygiene requirements such as the pharmaceutical industry, food industry, and biotechnology.
Characteristics of electromagnetic flowmeter
1.2.1 Electromagnetic flowmeter sensors have the following characteristics:
The linear measurement principle can achieve high-precision measurement without being affected by changes in fluid density, viscosity, temperature, pressure, and conductivity;
There are no flow blocking components inside the measuring tube, with low pressure loss and low requirements for straight pipe sections;
The measurable flow range is large, and the range ratio can be better than 1:20;
The nominal diameter of DN10-DN3200 has a wide coverage range, and there are multiple options for lining and electrodes to meet the requirements of measuring various conductive fluids.
1.2.2. The electromagnetic flowmeter converter has the following characteristics:
Adopting a 32-bit embedded microprocessor, fully digital processing, fast computing speed, strong anti-interference ability, reliable measurement, and high accuracy;
Low frequency square wave excitation, excitation frequency: 1/16 power frequency, 1/20 power frequency, 1/25 power frequency;
High frequency square wave excitation, excitation frequency: 1/2 power frequency (suitable for slurry measurement) (optional);
The excitation current can be selected as 125mA, 187.5mA, or 250mA;
● It has conductivity measurement function, no need for additional electrodes for empty tube measurement function, self check and self diagnosis function, continuous measurement, and constant value alarm;
Flow velocity measurement range: 0.1-15 meters/second, flow velocity resolution: 0.5 millimeters/second;
● AC high-frequency switching power supply, applicable voltage range: 85VAC~250VAC; DC 24V switching power supply, applicable voltage range: 20VDC –36VDC;
● Signal output: pulse, frequency output, 4-20mA current output;
Network functions: MODBUS, HART (optional);
High definition backlit LCD display, with Chinese and English display modes (customizable for other languages), easy to use, simple to operate, easy to learn and understand;
There are three internal integrators that can record the total amount: forward total amount, reverse total amount, and difference total amount;
● Power off time recording function, automatically records the interruption time of the instrument system power supply, and calculates the missing flow rate;
● Hourly total recording function, which records the total flow in hours and is suitable for time-sharing measurement system;
Infrared handheld operation keyboard, all functions of remote non-contact operation converter;
Adopting SMD devices and surface mount technology, the circuit reliability is high;
Can be used in corresponding explosion-proof situations.
Execute standard electromagnetic flowmeter JB/T 9248-2015
Verification Regulations for Electromagnetic Flowmeters JJG 1033-2007
Measurement of conductive liquid medium
Accuracy levels of 0.2%, 0.3%, 0.5%
Repeatability 0.16%
Fluid temperature -25 to+180 ℃
Flange standard HG/T 20592-2009
rated pressure
(Special pressure rating to be customized) nominal diameter rated pressure rating
DN10-DN50 4.0MPa
DN65-DN300 1.6MPa
DN350-DN1000 1.0MPa
DN1400-DN2000 0.6MPa
DN2200-DN3200 0.25MPa
Medium flow velocity range: 0.3-12m/s (extended range: 0.1-15m/s)
Conductivity ≥ 5uS/cm
Electrode materials include 316L stainless steel, Hastelloy B, Hastelloy C, tantalum, titanium, platinum, tungsten carbide, scraper electrodes, etc
Lining materials include fluoroprene rubber CR, polytetrafluoroethylene (PTFE), F46, PFA polyurethane rubber PU, alumina ceramics, etc
Body flange material: 20 # carbon steel, 304 stainless steel, 316L stainless steel, other materials (special order)
Standard signal cable length is 10m (split type)
Protection levels IP65, IP67, IP68
Converter power supply options include 220VAC, 24VDC, lithium battery power, etc
Standard signal output: pulse, frequency, 4-20mA current, Modbus communication;
Optional: HART communication protocol, GPRS, PROFIBUS, etc.
Whole machine power consumption 0.65W
Working environment temperature: -25~+60 ℃, humidity: 5%~90%
Explosion proof rating: not explosion-proof, explosion-proof Exd ib mb IIC T6 Gb
