Gas flow meter scale category and affect the measuring accuracy analysis

Abstract: the gas flow meter scale category and affect the measuring accuracy analysis information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1 type gas flowmeter based on the current development situation of natural gas measurement instruments, from the perspective of the measuring principle of gas flowmeter can be divided into five types, respectively, turbine flowmeter, ultrasonic flowmeter waist wheel flowmeter, orifice flow meter, and skin membrane. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a gas flow meter scale category and affect the measuring accuracy analysis for details. 1 type gas flowmeter based on the current development situation of natural gas measurement instruments, from the perspective of the measuring principle of gas flowmeter can be divided into five types, respectively, turbine flowmeter, ultrasonic flowmeter waist wheel flowmeter, orifice flow meter and skin membrane table [ 1 - 4] 。 Specific working principle and characteristics of all kinds of flowmeter, etc. As shown in table 1. 2 2 factors affecting measuring accuracy analysis. 1 gas pressure and temperature condition is sensitive to the change of pressure and temperature, the gas volume in the condition of measurement standard, according to the material of medium temperature and pressure, combined with the actual gas operation, reasonable alignment of natural gas standard range, can effectively reduce the measurement deviation. In the north, summer and winter temperature difference is big, gas flow metering error range of 3% ~ 8%, if not make standard of medium pressure and temperature measurement, the gas company will have a certain degree damage [ 1 - 4] 。 2. 2 measurement environment temperature of natural gas measurement accuracy also by environmental temperature change and change, the environment temperature changes, measurement accuracy is reduced. Long time at the temperature instability can lead to problems instruments, metering device is a device for the flow sensor, is a kind of thermal expansion materials, flow sensor perception is very sensitive to the change of working environment temperature. Measuring temperature is very low, gas measurement will be slower, measurement error will be larger, general for normal measurement value of 2. 6 to 3. Nine times, suggesting that the working environment temperature change on the influence on measuring instrument measuring accuracy [ 5] 。 2. 3 skills and training equipment operating personnel awareness of metrological specification and improving skills, to reduce man-made deviation measurement. In view of the personnel engaged in the work of flow metering, must strengthen the skills training and learning, improve the comprehensive level measurement team, first of all, to understand the measurement instrument performance, testing instrument flow under different pressure and temperature, according to working environment choice model, performance, appropriate measuring instruments; Second, installation training to operators, especially to understand the working principle of the meter to avoid measuring instrument installation is wrong, as a result of human improper operation caused larger measurement deviation. Aiming at these problems, to enhance the staff skills training, popularize knowledge of gas flow metering error, master the working principle of the metering device, can effectively guarantee the safe operation of gas fuel gas company. Three different types of flow meter precision influence factor analysis of 3. 1 speed flowmeter metering accuracy analysis flowmeter is zui is widely used in ultrasonic flowmeter, speed meter also includes turbine flowmeter, vortex flowmeter and vortex precession flowmeter. For speed meter measuring accuracy: (were the major influential factors 1) Fluid density, viscosity. The greater the density and viscosity, the greater the resistance measurement, high measuring accuracy, reduces only fluid velocity and flow pattern are relatively stable, and can improve the measurement accuracy. ( 2) The turbine flowmeter installation requirements. Measuring instrument installation deflection can cause measurement error. ( 3) Mechanical parts. Instrument parts size will affect the result of the turbine meter measuring, fluid containing impurities or meter long running, can produce the wear of a bearing pressure, reduce the measurement accuracy. 3. 2 volumetric flowmeter metering accuracy analysis volumetric flowmeter zui for typical is the waist wheel flow meter, computation flow formula is as follows: q =? n· V type: q for volume flow, m3 / s. N for the rotational frequency, week/s; Discharge volume V for a certain time, m3 / time. Leakage of larger influence on measurement accuracy. Leakage is associated with flow meter components clearance, clearance between parts, the greater the measurement error is bigger, the calculation of leakage flow caused by error formula is as follows: in the selection of flow meter, should pay attention to the instrument parts clearance inspection, to ensure that the various parameters in the range of allowable accuracy and can meet the requirements of measurement error. 3. 3 differential pressure flowmeter metering accuracy analysis, differential pressure flowmeter is mainly for the orifice flowmeter in the instrument had a greater influence on the accuracy of measurement of gas flow characteristics, the instrument performance, and installation conditions of use, etc. , concrete analysis is as follows: ( 1) Pressure and temperature. The change of environmental temperature and pressure of the gas will affect the viscosity, density and compression coefficient and measuring the fluid contains impurities may cause parts corner mouth, pipe bend forming corrosion and scouring. ( 2) Instrument performance. Thickness of orifice flow meter instrument and face flatness, parts of shaft, in pressure and pressure pipe position setting and tube length, etc. , will have an effect on the fluid accumulates fluid, to measure results precision is lower.

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