Digital Water Flow Meter

     Digital water flow meter is electromagnetic flow meter, which is an automation instrument that uses the principle of electromagnetic induction to measure the flow of conductive fluid based on the electromotive force induced when the conductive fluid passes through an external magnetic field.Electromagnetic flow meter is for liquid flow measuring , among all the liquids , water is the widely measured liquids , such as river water , drinking water , salt water , industrial usage water , sea water , sewage water , wastewater , municipal water etc.

    What is the components of Electromagnetic Flow Meter ? 

• Magnetic circuit system: produce a uniform DC or AC magnetic field. The DC magnetic circuit is realized by permanent magnets, its advantage is that the structure is relatively simple, and the interference from the AC magnetic field is small. However, it is easy to polarize the electrolyte liquid passing through the measuring tube, and the positive electrode is surrounded by negative ions, so the electromagnetic flow meter adopts AC magnetic field and is excited by 50HZ power frequency power supply.
• Measuring tube: Let the measured conductive liquid pass through. The measuring tube must be made of non-magnetic, low electrical conductivity, low thermal conductivity and a certain mechanical strength material. Such as the  Non-magnetic stainless steel, glass steel, high-strength plastic, Aluminum etc.
• Electrode: Its function is to draw out an induced electric potential signal proportional to the measured. Electrodes are generally made of non-magnetic stainless steel and are required to be flush with the lining so that the passage of fluid is not obstructed. Its installation position should be in the vertical direction of the pipeline to prevent sediment from accumulating on it and affecting the measurement accuracy.
• Shell: It is made of ferromagnetic material. It is the outer cover of the excitation coil of the distribution system and isolates the interference of the external magnetic field.
• Lining: There is a complete electrical insulating lining on the inner side of the measuring pipe and the flange sealing surface. It directly contacts the liquid to be measured, and its function is to increase the corrosion resistance of the measuring tube and prevent the induced potential from being short-circuited by the wall of the metal measuring tube. The lining materials are mostly corrosion-resistant, high-temperature and wear-resistant polytetrafluoroethylene plastics, ceramics, etc.
• Converter: The induced potential signal generated by the liquid flow is very weak and is greatly affected by various interference factors. The role of the converter is to amplify and convert the induced potential signal into a unified standard signal and suppress the main interference signal. Its task is to amplify and convert the induced electric potential signal detected by the electrode into a unified standard DC signal.

Flow Range Table :