3. electrochemical polarization potential interference. Electrochemical polarization potential interference is due to differences in bipolar electrode polarity induced electromotive force caused by electrolyte polarization generated on the electrode surface. Although the use of positive-negative alternating excitation magnetic field can significantly weaken the polarization potential of the order of magnitude, but not essentially completely eliminate polarization potential interference. Its properties on the nature of the fluid medium, the nature of the electrode material, dimensions related to the shape of the electrodes, with changes slowly, and other characteristics of magnitude less fluid electrochemical potential interference and their solutions. So choose a suitable electrode material (such as tungsten carbide) KF700 electromagnetic flowmeters offer, to design the best shape of the electrode size is an effective method to reduce the polarization potential; other uses alternating positive and negative poles of the rectangular wave excitation technology with Microprocessor synchronous pulse width sampling technique to use microprocessor computing functions sampled twice before subtracting eliminate traffic signal potential of polarization potential interference. Power supply interference. Electromagnetic flowmeters are generally used frequency AC power supply, changes in its supply voltage amplitude and frequency of the electromagnetic flowmeters will bring power to interference noise. Changes in the amplitude of the supply voltage electromagnetic flowmeters Main KF700, because the use of multi-level integrated voltage regulator, the magnitude of change in general supply voltage electromagnetic flow measurement accuracy is not affected. When the frequency of the power supply voltage fluctuations, although its fluctuation range is limited, but the electromagnetic flowmeter measurement accuracy greater impact. Intelligent use of square wave excitation pulse electromagnetic flow meter wide sampling technology, the pulse width is an integer multiple of the power frequency cycle, with synchronized in frequency cycle, in order to completely eliminate frequency interference, but the prerequisite is a basic no-frequency noise change. When the power supply when the power frequency electromagnetic flowmeter KF700 frequency fluctuations, the flow signal sampling noise can not exactly make the front and rear, although the use of synchronous excitation technique, synchronous sampling techniques are still not completely eliminate frequency interference noise, must use the appropriate frequency compensation techniques , the field current, the sampling pulse, a / d converter simultaneous changes in frequency. KF700 electromagnetic flowmeter _ direct force measurement instrument _KF700 since 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.