With a precision grade and functional market performance general-emf big difference, some high precision, multi-function, low some precision, simple function. High precision instrument fundamental error (± 0.5% ~ ± 1%) r, precision instrument was low (± 1.5% ~ ± 2.5%) fs, the price difference between 1 to 2 times. Therefore, measurement accuracy is not very high places (such as non-trade accounts only for the purpose of control, only requires high reliability and excellent repeatability place) high precision instrument is economically uneconomical. Some models Meter claimed to have higher accuracy, only basic error (± 0.2% ~ ± 0.3%) r, but there are strict installation requirements and reference conditions, high-precision turbine flowmeter, such as ambient temperature 20 ~ 22 ℃, turbine flowmeter price, front and rear straight pipe length requirements are greater than 10d, 3d (usually 5d, 2d) even suggested the flow sensor to the front and rear straight tubes, one for actual flow calibration on the flow standard devices to reduce clamp poor impact. 3. electrochemical polarization potential interference. Electrochemical polarization potential interference induced electromotive force is due to differences in bipolar electrode polarity and lead to electrolyte polarization is generated in the electrode surface. Although the use of positive and negative alternating excitation magnetic field can significantly weaken the polarization potential of magnitude, but can not completely eliminate the fundamental polarization potential interference. Their characteristics in the nature of a fluid medium, the material properties of the electrode, the shape of the electrode dimensions is related to Shenyang turbine flowmeter, with changes slowly, magnitude and other characteristics of small, fluid electrochemical potential interference and its solutions. So choose a suitable electrode material (such as tungsten), to design the best shape of the electrodes is an effective way to reduce the size of the polarization potential; other uses alternating positive and negative poles of the rectangular wave excitation technology with microprocessor synchronous wide pulse sampling technique to use two samples before and after the operation function microprocessor subtracted eliminate traffic signal potential of the polarization potential interference. Shenyang turbine flow meters, measured from the force meter, liquid turbine flow meter measuring the force provided by the Shanghai Automation Instrumentation Co., Ltd. "Industrial thermocouple, RTD, transmitters, flowmeters, intelligent instruments, actuators' preferred measure of the Shanghai Automation Instrumentation Co., Ltd. (www.licesh.com), the company is located: Zhabei District, Shanghai Luochuan Road 638 No, for many years, since the force measuring instrument to provide customers with the best quality service, contact: Hua powder. Welcome to the new and old customers call, letter, visit the guide, business negotiations. Force measurement since the instrument expect to be your long-term partner!