Application of flow calibration system and flow meter

Abstract: The application information of flow calibration system and flow meter is provided by excellent flow meter and flow meter manufacturers. Flow verification system The flowmeter must be verified before leaving the factory and after a period of use. The flow verification (or verification) involves the flow verification device and verification method. The purpose of calibrating flow meters at the factory and in use is to standardize measurements. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application article details of the flow calibration system and flowmeter. Flow calibration system The flowmeter must be calibrated before leaving the factory and after a period of use. The flow calibration (or calibration) involves the flow calibration device and calibration method. The purpose of calibrating the flow meter at the factory and in use is to standardize the measurement, such as the accuracy and repeatability of the flow meter. The purpose of calibrating the flow meter during development is to find out the mathematical model of the meter's characteristics, and to determine the static and dynamic characteristics and measurement methods of the flow meter. The flow verification method is generally divided into two types: the verification device method and the standard table method. Flow verification device The flow verification device is also called the flow standard device. The flow calibration device is a test equipment that meets the fluid flow characteristics, fluid properties and working state characteristics of the flowmeter. The main functions of the flow calibration device are as follows: (1) Carry out the instrument characteristic test. Research the static and dynamic characteristics of the instrument under laboratory conditions and field conditions, determine the technical indicators such as instrument accuracy, measurement range, adaptable working state, instrument stability and reliability, so that the instrument can be finalized and produced. ②Research the characteristic changes caused by different medium properties and flow characteristics in the field use of the instrument, and find out the correction method. ③As a standard device for the unification and transmission of the unit value of flow, it keeps the value of each department accurate and unified. The flow calibration device is divided into water flow standard device and gas flow standard device according to the type of calibration medium. 1. Water flow standard device The flow standard device that uses water as the calibration medium is called the water flow standard device. The most widely used water flow standard device at home and abroad is the static calibration method water flow standard device of the stable pressure source. Figure 4-42 shows the system diagram of the static volumetric water flow standard device. This device obtains a stable pressure source by means of a high-level water tower or a pressure-stabilizing container, and uses a commutator to switch the flow direction of the fluid, so that the fluid flowing through the cross-section of the pipeline is divided from the flow and flows into the metering container within a certain time interval, thereby obtaining The magnitude of the standard volume flow (or mass flow). When the system starts to work, first use the water pump to feed water to the high-level water tower. The high-level water tower is equipped with an overflow tank. When the liquid level in the water tower rises above the height of the overflow tank, a part of the water above the overflow tank overflows from the overflow tank. , and flow back to the pool through the overflow pipe. In this way, the total pressure of the fluid in the test pipeline can be kept stable, so as to obtain a stable fluid flow. Adjust the commutator to the position where the liquid flow flows into the bypass pipe, and the liquid flow will flow to the pool through the bypass pipe. When starting to work, first adjust the regulating valve to the required flow rate. After the flow is completely stable, the controller can be used to make the commutator act, and the liquid flow will be guided to the standard volume meter. After a certain time interval, the control valve can be used. The commutator moves in the opposite direction, leading the liquid flow to the bypass pipe. Record the time interval At between the two actions of the commutator, and read the fluid volume Al introduced into the standard volume meter by the commutator, then the standard value of the volume flow can be calculated by the following formula: The accuracy of the static volume method water flow standard device is general reachable±0.1%~±0.2% or higher 0 2. Gas flow standard device The flow standard device with gas as the calibration medium is called the gas flow standard device. Gas flow is not only related to parameters such as volume and time, but also physical properties such as temperature and pressure, so gas flow standard devices are generally more complicated than liquid flow standard devices. In order to meet the needs of the calibration of gas flow meters of different types and flow ranges, there are now various forms of gas flow standard devices: the gas flow standard device of the PVTt method, the gas flow standard device that uses a sonic nozzle to generate a constant flow, and Bell jar type gas flow correction device. Here, only the bell-type gas flow correction device is introduced as a gas standard container. Due to the isolation effect of the lower liquid, a standard volume of stored gas is formed in the bell jar. The working gas is fed or discharged from the pipe at the bottom. In order to ensure the constant pressure in the bell jar and eliminate the change of pressure in the bell jar caused by the change of the immersion depth of the bell jar, the upper part of the bell jar is suspended with a corresponding counterweight through a pulley. There are graduated scales on the side of the bell to measure the volume of gas inside the bell

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