The LDC type intelligent electromagnetic flowmeter is a fully intelligent electromagnetic flowmeter developed by our company using advanced technologies at home and abroad. Its all Chinese electromagnetic converter core adopts a high-speed central processing unit, with very fast calculation speed, high accuracy, and reliable measurement performance. The design of the conversion circuit adopts advanced international technology, with an input impedance of up to 1015 ohms, a common mode rejection ratio better than 100db, and a disturbance rejection ability better than 90db for external interference and 60Hz/50Hz. It can measure fluid medium flow rates with lower conductivity. The sensor adopts non-uniform magnetic field technology and a special magnetic circuit structure, which ensures stable and reliable magnetic field, reduces volume and weight, and is the characteristic of small-sized flow meters.
Product Features
There are no movable parts or flow blocking components inside the pipeline, and there is almost no additional pressure loss during measurement. The measurement results are independent of physical parameters such as flow velocity distribution, liquid pressure, temperature, density, viscosity, etc. ▲ The range can be modified online according to the actual needs of the user on site. ▲ High definition backlit LCD display, fully Chinese menu operation, easy to use, simple to operate, easy to learn and understand. ▲ Adopting SMD devices and surface mount technology (SMT circuits have high reliability). ▲ Adopting a 16 bit embedded microprocessor, it has fast computing speed, high accuracy, and programmable rectangular wave excitation, which improves the stability of flow measurement Sex and low power consumption. ▲ All digital processing, strong anti-interference ability, reliable measurement, high accuracy, and a flow measurement range of up to 150:1. ▲ Ultra low EMI switching power supply, with a wide range of power supply voltage changes and good EMC resistance. ▲ There are three integrators inside that can display the forward cumulative amount and the difference cumulative amount respectively. There is also a non power down clock inside that can record 16 power failures Electricity time. ▲ It has digital communication signal outputs such as RS485, RS232, Hart, and Modbus.
Working principle
The measurement principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. The measuring tube of the flowmeter is a non-magnetic alloy short tube lined with insulating material. Two electrodes are fixed on the measuring tube by passing through the tube wall along the diameter direction. The electrode tip is basically flush with the lining surface. When the excitation coil is excited by square wave pulses, a working magnetic field with a magnetic flux density of B will be generated in the direction perpendicular to the axis of the measuring tube. At this point, if a fluid with a certain conductivity flows through the measuring tube, it will cut the magnetic field lines and induce an electromotive force E. The electromotive force E is proportional to the magnetic flux density B, which is the product of the inner diameter d of the measuring tube and the average flow velocity v. The electromotive force E (flow signal) is detected by the electrode and sent to the converter through a cable. After amplifying and processing the flow signal, the converter can display the fluid flow rate and output signals such as pulses and analog currents for flow control and regulation.
E=KBdV In the formula, E - represents the signal voltage (V) between the electrodes B -- Magnetic flux density (T) D - Measure the inner diameter of the tube (m) V -- Average flow velocity (m/s) In the equation, K and d are constants. Since the excitation current is constant, B is also constant. Therefore, from E=KBdV, it can be seen that the volume flow rate Q is proportional to the signal voltage E, that is, the signal voltage E induced by the flow velocity is linearly related to the volume Q. Therefore, as long as E is measured, Q can be determined, which is the basic working principle of electromagnetic flowmeter. According to E=KBdV, parameters such as temperature, density, pressure, conductivity, and liquid-solid composition ratio of the measured fluid medium will not affect the measurement results. As for the flow state, it is a true volumetric flow rate. Without any need for correction. This is the outstanding advantage of electromagnetic flow meters, which is not found in any other flow meters. There are no moving or blocking components inside the measuring tube, so there is almost no pressure loss and it has extremely high reliability.
Main technical parameters
▲ Nominal Diameter Series DN (mm) Pipeline type PTFE lining: 10,15,20,25,32,40,50,65,80,100,125, 150,200,250,300,350,400,450,500,600 Pipeline type rubber lining: 40,50,65,80,100,125,150,200,250,300,350,400, 500,600,800,1000,1200 Note: Special specifications can be customized ▲ Flow direction: Positive, negative, and net traffic Range ratio: 150:1 Repetitive error: ± 0.1% of the measured value ▲ Accuracy level: Level 0.5, Level 1.0 ▲ Temperature of the tested medium: Ordinary rubber lining: -20~+60 ℃ High temperature rubber lining: -20~+90 ℃ PTFE lining: -30 to+100 ℃ High temperature PTFE lining: -30 to+180 ℃ ▲ Rated working pressure: Pipeline type: DN10... DN80 ≤ 1.6MPa, DN100…DN250:≤1.0MPa, DN300... DN1200: ≤ 0.6MPa High pressure customizable ▲ Flow measurement range: The flow measurement range corresponds to a flow velocity range of 0.1-15m/s	▲ Conductivity range: The conductivity of the tested fluid is ≥ 5 μ s/cm (integrated type) for most The medium composed of water has a conductivity of 200-800 Electromagnetic flow meters can be used to measure the flow rate within the range of μ S/cm. ▲ Current output: Load resistance: 0-1.5K Ω when 0-10mA When 4-20mA, 0-750 Ω ▲ Digital frequency output: The upper limit of the output frequency can be within 1-5000HZ Set the collector open circuit bidirectional output of a transistor with photoelectric isolation When the external power supply is ≤ 35V and conducting, the maximum collector current is 250mA ▲ Power supply: AC85～265V，45～63HZ ▲ Length of straight pipe section: Pipeline type: upstream ≥ 5DN, downstream ≥ 2DN ▲ Connection method: The flowmeter is connected to the piping using flanges The size should comply with the provisions of GB11988. ▲ Environmental temperature: -25 ℃ to+60 ℃ ▲ Relative humidity: 5% to 95% ▲ Total power consumption: less than 20W
Electromagnetic flowmeter selection code
Pipeline type:
Example of selection code:
Measurement medium: sewage pipeline diameter: DN50 electrode selection: Mo2Ti on-site display Lining Material: Rubber Output Signal: 4-20m/A/1-5KHz No Communication Intelligent Type Upper limit flow rate: 30 m3/h Code: LDCE-50S-M1X100-30
Selection of traffic range:
The maximum and minimum flow rates must comply with the numbers in the table below.
Dimensions of the flowmeter:
Flow rate (m3/h) - average flow velocity of circular pipe (m/s) relationship diagram