Electromagnetic Flow Meter Structure
It can be seen that the electromagnetic flow meter mainly consists of the following parts:
1-converter; 2-flange; 3-insulating lining. 4-electrode; 5-measuring tube; 6-excitation coil. 7-shell
The two main components of electromagnetic flow meter are sensor and converter. The sensor includes a flange, a lining, an electrode, a measuring tube, an excitation coil and a sensor housing; the converter includes an internal circuit board and a converter housing.
(1) Converter: provides a stable excitation current for the sensor, amplifies the induced electromotive force generated by the sensor and converts it into a standard electrical signal or frequency signal. In this process, the flow and parameters are displayed in real time in order to display, control and adjust the flow.
(2) Flange: connect with the process pipeline.
(3) Lining: apply a complete layer of electrical insulation and anticorrosive material on the inside of the measuring tube and the flange cover.
(4) Electrode: a pair of electrodes are installed on the wall of the measuring tube perpendicular to the magnetic force line to detect the flow signal. The electrode material can be selected according to the corrosion performance of the tested medium. In addition, 1 to 2 grounding electrodes can be installed for grounding and anti-interference of flow signal measurement.
(5) Measuring tube: the tested medium flows through the measuring tube. The parts of the measuring tube are non-magnetic stainless steel and flanges lined with insulating lining.
(6) Excitation coil: a set of coils are installed on the upper and lower sides of the measuring tube to generate the working magnetic field.
(7) Shell: both protect and seal the instrument.
Application
Often be used in project, sewage treatment, water supply, water discharge etc. In these industries, large-caliber (DN400-DN1000) electromagnetic flowmeters are usually selected to measure the flow of water inlet and outlet.
Due to the strong corrosiveness in sewage, 316L electrodes and PTFE linings are often selected to measure the flow rate in wastewater
Flow meters are an essential tool for monitoring and controlling the flow of liquids in sewage treatment plants. They are used to measure the flow rate of sewage through the various stages of treatment and ensure that the plant is operating efficiently and effectively. There are several types of flow meters used in sewage plants, including electromagnetic flow meters, ultrasonic flow meters, and positive displacement flow meters.
Electromagnetic flow meters are commonly used in sewage treatment plants due to their ability to measure the flow of conductive liquids, which is ideal for monitoring the flow of sewage. These meters use Faraday's Law of Electromagnetic Induction to measure the velocity of the liquid and calculate the flow rate. They are highly accurate and reliable and can be used in a wide range of pipe sizes and flow rates.
PARAMETERS
• Diameter Nominal: DN10~DN600
• Ingress protection: IP65
• Electrical conductivity: Water 20μS/cm other medium 5μS/cm
• Ambient Temperature: -10℃~60℃
• Medium Temperature: Integral type: -10℃~120℃
• Electrode material: Stainless steel SUS316, Hastelloy C, Titanium,Tantalum Platinum-iridium
• Liner material: PFA, F46, Neoprene, PTFE, FEP
• Accuracy: ±0.5%, ±2mm/s(flowrate<1m/s)
• Nominal Pressure: 0.6~4.0MPa
FEATURE
1. 304 stainless steel, containing more than 18% chromium, more than 8% nickel content
2. =< DN150, adopt seamless pipe, strong pressure resistance
3. Flange selection GB/ANSI/JIS/DIN optional
4. Spray paint(thickness of the paint surface exceeds 90um)
5. Pure copper coils to ensure a stable magnetic field
6. Each flow meters will be calibrated and tested before shipment, and the test report will be keep for three years.
ADVANTAGE
• They are non-obstruction type of flow meters.
• No pressure loss.
• The pipe is surrounded by electromagnet which produces magnetic field.
• The fluid flowing through pipe is conducting type.
• No obstruction is created to flow.
• It is mainly suitable for hydraulic solid transport.
• It is unaffected by changes in temperature, density, viscosity, concentration and electrical conductivity.
DISADVANTAGE
• It is not suitable for low velocity.
• Gas inclusion cause errors.
