Flow calibration system and the application of flow meter scale

Abstract: the flow calibration system and the application of flow meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Flow meter calibration system used in the factory before and after a period of time to do all flow calibration, flow calibration ( Or verification) Involves the flow calibration device and method. To calibrate the flow meter in the factory and use of standardized measurement, is the purpose of. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a flow calibration system and the application of flow meter scale article details. Flow meter calibration system used in the factory before and after a period of time to do all flow calibration, flow calibration ( Or verification) Involves the flow calibration device and method. To calibrate the flow meter in the factory and use of standardization is the purpose of measurement, such as flow meter accuracy, repeatability, etc. Check at the time of the flow meter in development, the purpose is to find out the instrument characteristics, the mathematical model to determine the static and dynamic characteristic of the flow meter and measuring method. Flow calibration method is generally divided into device method and standard table method two kinds. The flow calibration device flow calibration device is also called flow standard device. Flow calibration device is to satisfy the flow fluid flow characteristics, fluid properties and working condition characteristics of test equipment. The role of the flow calibration device mainly has: (1) meter performance experiment was carried out. Research instrument under the condition of laboratory and field under the condition of static and dynamic characteristic, precision instrument, measuring range, to adapt to the working condition, instrument stability and reliability of the technical indicators, such as the instrument to finalize the design production. (2) for the instrument in the field use due to dielectric properties and flow characteristics of different characteristics, find out the correct way. (3) as a standard of flow unit value unity and transfer equipment, to keep the quantity of each department in precise and unity. Flow calibration device according to the calibration medium types are divided into water flow standard device and gas flow standard device. 1. Water flow standard device as a calibration medium water flow standard device known as the water flow standard device, zui widely at home and abroad to use the water flow standard device to stabilize the pressure source of static calibration method of the water flow standard device. Figure 4 - Shown in 42 static volumetric method for water flow standard device system diagram. The device with high water tower or voltage stabilizing container to secure a stable source, with switch commutator fluid flow direction, so that in a certain time interval through the pipe cross section segmented from the flow of fluid into the measurement container, the resulting standard volume flow ( Or mass flow) The value of the. System began to work, with the pump to high water tower water, high water tower with overflow tank, when the liquid surface in the water tower to rise to higher than the overflow tank height, higher part of the overflow tank water from overflow tank overflow, and through the overflow pipe flow back to the pool. In this way can keep the test pipe shed the stability of the total pressure, thus the stability of fluid flow. The commutator to adjust to flow into the position of the by-pass pipe, liquid will flow through the by-pass pipe flow to the sink. Started out to adjust the control valve to the desired flow rate, flow to achieve full stabilized, can use the controller make the commutator, will flow standard volume meter, using the controller after a certain time interval, and make the commutator reverse direction, will flow by-pass pipe. Record commutator two movements At the time interval, and read by the commutator import standard volume meter Al fluid volume can be calculated from the type volume flow standard: static volumetric method, the accuracy of the water flow standard device generally can reach & plusmn; 0. 1%~± 0. 0 2 2% or more. Gas flow standard device for gas calibration medium flow standard device called a gas flow standard device. Gas flow in addition to related to the parameters such as volume, time, also related to physical properties, such as temperature, pressure, so the gas flow standard device is generally more complicated than the liquid flow standard device. In order to adapt to different types, different flow range of gas flow meter calibration needs, now has a variety of forms of gas flow standard device: PVTt method of gas flow standard device, using sonic nozzle to produce a constant flow of gas flow standard device and clock bell type gas flow calibration device. Here only introduce bell jar type gas flow calibration device as gas standard containers is the bell jar, the bottom of the bell is a sealed container. Due to the effect of isolation of the lower liquid, make bell jar in standard volume of stored gas. Working gas into or out from the bottom of the pipes. In order to guarantee the pressure inside the bell constant, and eliminate the bell immersion depth change causes the pressure variation in bell, bell after upper pulley hanging in the corresponding balance weight. Bell side after dividing scale, by measuring the volume of gas inside the bell. On flowmeter calibration, the blower send gas system, float the bell, when the amount of gas flow through to the expected requirement, put the three way valve to vent position to stop the air intake. Put ^ make bell, bell inside the gas been flow meter in the school, the bell of the scale value conversion for gas volume change, namely calibrated instruments are accumulated through the volume.

mass flow meter has become a standardized way of dealing with tuning fork liquid density meter.

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