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technical article
There are two situations where glass rotor flowmeters can not be used directly.
2012-4-7 10:57:03

Installation and use instructions: How to choose the glass rotor flowmeter correctly The glass rotor flowmeter is an instantaneous flow measuring instrument that is simple to use, convenient to read, and widely used. In the field of environmental protection equipment and instruments, the amount is more than 30,000 units / year. Therefore, it is extremely important to choose and use this instrument.
的品种及选用:玻璃转子流量计根据它的用途和适应范围可分为:普通型、带筋维管型,微小流量及小外形型、耐腐型、实验室型、保温型、报警型和耐高压型八个系列。 I. Variety and selection of glass-to-flowmeters : Glass rotor flowmeters can be divided into: ordinary type, ribbed vascular type, micro flow and small outline type, corrosion-resistant type, and laboratory type according to its use and scope of application. , Insulation type, alarm type and high pressure resistant eight series. According to the instrument series spectrum developed by the country, no matter which series includes a maximum of 12 calibers from 1mm to 100mm, the measurable flow range is: liquid (water) 0.1ml / min ~ 40m3 / hour, gas (Air) 1 ml / min to 1000 cubic meters / hour. The glass rotor flowmeter used for environmental protection instruments generally has a diameter of no more than 10 mm, and the measured flow belongs to a small flow range. The selection of glass rotor flowmeter can be considered from the following aspects. 1. The object of measurement. That is to measure the type of medium, pressure, and chemical properties. For liquid and gaseous media, for corrosive media, a corrosion-resistant flowmeter should be selected. 2. The performance of the flow meter itself. After the above conditions are determined, generally speaking, if there is no major change in price, the needle valve is preferred to be placed on the upper part of the flowmeter; those with larger flow holes are directly flow-scaled; simple structures; smaller external dimensions, etc . If it is a small flow range, you can use the ball float type, because it is stable during measurement, not easy to accumulate dust, high accuracy, and good interchangeability. 3. Select based on price. Generally speaking, high accuracy and high price. To select the accuracy level of the instrument according to the measurement purpose, if you only need to control the throughput of the measurement medium and adjust it after trial operation, you must always stabilize the throughput in the future, then the accuracy is secondary.

的刻度修正 Calibration of glass rotor flowmeter


The calibration of the glass rotor flowmeter is obtained by the factory under the conditions of the factory using water and dry air close to the ideal fluid as the medium. However, there are two situations where the scale value of the flowmeter cannot be used directly: one is that the measurement medium is not water and air, and the other is that the medium is water and air, but its state (temperature, pressure) and scale The status is different. In this way, when using a flow meter, in order to obtain a correct measurement result, a problem arises that the scale value needs to be corrected. Therefore, solving the calibration of the glass rotor flowmeter is the key to using this instrument. Considering that environmental protection instruments use rotor flowmeters to measure the flow of gaseous media, only the density correction in gaseous media measurement is discussed below. Because the viscosity of the gaseous medium is small, the viscosity effect is omitted in the discussion. Practice has proved that this does not affect the accuracy after the correction.


应用范围:玻璃转子流量计应用及其广泛,流量测量技术与仪表的应用大致有以下几个领域。 Application scope of glass rotor flowmeters: Glass rotor flowmeters are widely used. The application of flow measurement technology and instruments has the following areas.

I. Industrial production process: Flow meter is one of the large-scale meters in process automation meters and devices. It is widely used in metallurgy, electricity, coal, chemical industry, petroleum, transportation, construction, light textile, food, medicine, agriculture, Environmental protection and people's daily life, in various areas of the national economy, are important tools for developing industrial and agricultural production, saving energy, improving product quality, and improving economic efficiency and management. They occupy an important position in the national economy. Among the process automation instruments and devices, the flow meter has two major functions: as a detection instrument for the process automation control system and a total meter for measuring the quantity of materials. Second, energy measurement: energy is divided into primary energy (coal, crude oil, coal bed gas, petroleum gas and natural gas), secondary energy (electricity, coke, artificial gas, refined oil, liquefied petroleum gas, steam) and energy-bearing working fluid ( Compressed air, oxygen, nitrogen, hydrogen, water) and so on. Energy measurement is an important means of scientifically managing energy, realizing energy saving and consumption reduction, and improving economic benefits. Flow meters are an important part of energy measurement instruments. Water, artificial gas, natural gas, steam, and oil products use an extremely large number of flow meters. They are indispensable tools for energy management and economic accounting. Third, environmental protection projects: the discharge of flue gas, waste liquid, sewage, etc. seriously pollutes the atmosphere and water resources, and seriously threatens the human living environment. The state has listed sustainable development as a national policy, and environmental protection will be the biggest issue in the 21st century. To control air and water pollution, management must be strengthened, and management is based on quantitative control of pollution. China is a country with coal as its main energy source. There are millions of chimneys in the country that continuously emit smoke to the atmosphere. Flue gas emission control is an important project to eliminate pollution. Each chimney must be equipped with flue gas analysis instruments and flow meters to form a flail emission monitoring system. The flow rate and volume of the flue gas are very difficult. The difficulty is that the chimney is large in size and irregular in shape, the gas composition varies, the flow rate range is large, dirt, dust, corrosion, high temperature, no straight pipe sections, etc. 4. Transportation: There are five ways: railway, air, water, and pipeline transportation. Although pipeline transportation has already existed for a long time, its application is not universal. With the prominence of environmental protection issues, the characteristics of pipeline transportation have attracted people's attention. Pipeline transportation must be equipped with a flow meter, which is the eye for control, distribution and dispatch, and an essential tool for safety oversight and economic accounting. V. Biotechnology: The 21st century will usher in the century of life sciences, and industries featuring biotechnology will develop rapidly. There are many substances to be monitored and measured in biotechnology, such as blood and urine. Instrument development is extremely difficult, with a wide variety.