Precision meter scale decline reason and solution

Abstract: precision meter scale down the reason and solution information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. At present, there are many kinds of flowmeter, but there are usually used volumetric flowmeter, electromagnetic flowmeter, turbine flowmeter, vortex flowmeter, etc. About the accuracy of the flow meter is generally established in the factory under the condition of the reference. Reference condition. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a meter scale decline reason and the solution precision article details. At present, there are many kinds of flowmeter, but there are usually used volumetric flowmeter, electromagnetic flowmeter, turbine flowmeter, vortex flowmeter, etc. About the accuracy of the flow meter is generally established in the factory under the condition of the reference. Factors that affect the reference condition are environmental conditions, the electromagnetic flowmeter power supply condition, fluid, etc. Flow meter, however, the actual working conditions are usually different from the reference condition, therefore, in use process will be a drop in accuracy. Moreover, different degree of precision instrument changes are different. Here are aimed at different flow meter and analyze its accuracy to the cause of the solution: 1, the throttling device throttling device such as to the accuracy of the instrument is generally not need calibration, fluid delivery inspection use & more other Dry standard & throughout; Method, basic accuracy can be calculated. The calculation is based on the buyer offer & other Rating & throughout; , the density of the medium can be used, intelligent automatic compensation, according to this situation need to focus on is whether to conform to the requirements of the instrument, instrument installation site straight pipe length, for example, if can not meet the requirements, the additional error calculation to refer to the instructions of the instrument. If the density of the medium using artificial calculation, when the actual state of fluid is different from the design condition, for the general gas to flow display value multiplied by a correction factor, T, Z, P respectively the design temperature of the medium under rated working condition, compressibility, medium pressure; T, z, p respectively, the actual work condition of medium temperature, compression coefficient, medium pressure. Obviously, the actual work is random changes when the temperature of the fluid pressure, ultrasonic flowmeter artificial compensation can only compensate for the average, the error is significant, the better way is to use an intelligent instrument automatic compensation. For an ideal ( Or close to ideal) Gas, the compensation accuracy is high, show or the accuracy of the standard volume flow to mass flow & plusmn; 1%. Throttling device on the straight pipe has certain requirements, when cannot meet, the additional error caused by the standard throttling device has a regulation. 2, volumetric flowmeter for volumetric flowmeter in the actual work condition, usually because of the additional error caused by fluid temperature and pressure on the influence of the measuring chamber volume, in the case of known cavity material, can calculate the volume change, modify it to display instrument readings. The actual fluid viscosity meter reading may also have an impact, according to the instructions of instrument. And length of straight pipe generally does not affect its precision, this is the advantages of this kind of instrument is prominent. Such instrument shows the volume flow of fluid in the working status, the user need is usually standard condition or volume flow to mass flow, fluid density compensation is needed. Now most of new type flowmeter using the intelligent display instrument, and the density of automatic compensation. 3 the principle of electromagnetic flowmeter, electromagnetic flowmeter is based on Faraday electromagnetic induction theorem, sensor pipe diameter ( Circulation area) Has influence to the measured value, the pressure of the fluid medium temperature is different from the reference condition, the circulation area of different causes the change of the meter reading can be calculated, otherwise will produce certain error. The instrument has low requirement to the straight pipe, pressure transmitter users to note that there is no correction formula in straight section is insufficient. The instrument measurement is the working status of the volume flow, if need standard condition or volume flow to mass flow, density compensation is still required. 4, turbine flowmeter, this type of meter is more sensitive to the scene of the conditions, good user zui completely meet the requirements of it, in order to keep the factory precision. When the temperature of the fluid medium pressure with a greater difference between reference condition, according to the material of sensor and temperature and pressure calculated the volume change of the sensor shell, provision of meter reading. When fluid under the working state of the viscosity of the fluid viscosity and calibration is large, shall be provided according to the instrument factory to modify the viscosity of the modified curve. Turbine flowmeter has certain requirements of its upstream and downstream straight pipe length, should try to meet, especially when the user requirements and high precision. Instrument shows the working medium under the condition of traffic volume, if you want to know what a standard or volume flow to mass flow and density compensation is needed. Turbine flowmeter measurement accuracy is higher, is used as a standard to calibrate the instrument table.

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