Through the outlet valve to control water switch, open the valve timing, when the timing to close the valve after the measurement of the weight of the water bucket can know the flow of water per unit of time. Also known as the time of the gravimetric method. Before measuring exhaust first, you need professionals to solve electromagnetic flowmeters offer high-quality, takes half an hour to put the pipeline gas drained. If you do not put the drained gas pipeline that would lead to a decline measurement accuracy. There must be a full tube inside the pipe. So this paper the flowmeter placed obliquely upward state, it can guarantee a full pipe flow meter, especially in zero time. The basic principle of emf is Faraday's law of electromagnetic induction, which cut the conductor in a magnetic field induced electromotive force at both ends when the magnetic field lines. 1, the conductive liquid produced is proportional to flow induced electrical potential on the non-perpendicular to the magnetic field of the flow measuring tube, a direction perpendicular to the flow direction, the direction of the electromotive force by "Fleming's right hand rule", the value the following formula wherein e ----- induced electromotive force, i.e., a high-quality electromagnetic flowmeter flow signal image, v; k ----- coefficient; b ----- magnetic induction, t; d ---- Measurement tube diameter, m; --- average flow velocity, m / s. Based liquid volume flow for high quality wholesale electromagnetic flowmeters, where k is the instrument constant, k = 4 kb / πd. emf by two major flow sensor and converter. A typical sensor structure shown in Figure 2, the measuring tube provided with the upper and lower excitation coils electromagnetic flow meter, the exciting current produces a magnetic field after the pass through the measuring tube, a pair of electrodes mounted on the inner wall of the measuring tube in contact with the liquid phase, leads to induced potential, to the conversion device. Magnetizing current provided by the converter. High-quality electromagnetic flowmeters pictures | force measuring instrument at reasonable prices since | Jilin electromagnetic flowmeters measure the force provided by the Shanghai Automation Instrumentation Co., Ltd .. Shanghai Automation Instrumentation Co., force measurement (www.licesh.com) is the Shanghai Zhabei District, flow meters leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Since the force measuring device leadership with the staff warmly welcome all inquiries negotiations to create the force measuring instrument since a better future.