It should be said that the glass rotor flowmeter is widely used in the industry, and it is also the most used type, such as the chemical industry, petroleum industry, pharmaceutical industry, light industry, food industry, environmental protection industry, etc. , Used to measure the flow rate of single-phase non-pulsating fluid, where fluid refers to gas and liquid. The function and characteristics of the glass rotameter are very obvious. It measures the instantaneous flow of the current fluid. During the measurement, the pressure loss is small and the performance is reliable. The glass rotameter has a simple structure and is easy to install and use. Compared with a glass flowmeter, The price of rotameter is very low.For such a flow meter that has a significant effect and is widely accepted, people not only need to know its role, but also how to play its maximum role, and how to choose the most suitable glass rotor flow rate according to the measurement medium. Meter, so that the effect of the use of the measurement effect is better.First of all, when choosing a glass rotameter, there must be a rough measurement value range. The maximum flow rate of the medium that needs to be measured is not to say that the larger the measurable flow range of the glass rotameter, the better, but also consider the fluid. The pressure range, after all, is a glass tube product, which can withstand pressure has a certain limit. Flow range and pressure range are issues that must be considered when choosing.Of course, there is also a problem of measuring the medium. The density of any kind of medium is different, and the characteristics of any kind of medium are also different. The scale of the glass tube on the glass rotameter is calibrated according to the specific measuring medium to ensure the accuracy of the measurement. The specific measuring medium is selected when selecting the type. It also needs to be provided to the flowmeter manufacturer. There are many substances that are corrosive, such as strong acids, strong bases, oxidants, organic solvents, etc. For these corrosive fluids, it is necessary to use corresponding technologies to achieve the effect of anti-corrosion and ensure the normality of measuring instruments. use.1. How to select the anticorrosive glass rotor flowmeter correctly:The glass rotor flowmeter is an instantaneous flow measuring instrument that is simple to use, convenient to read, and has a wide range of uses. In the category of environmental protection equipment and instruments, the amount should be widely used. Therefore, it is extremely important to select and use this instrument glass rotameter well.2. Variety and selection of glass transfer flow meterAccording to its use and scope of application, glass rotameter can be divided into eight types: ordinary type, ribbed vascular type, small flow and small shape type, corrosion-resistant type, laboratory type, insulation type, alarm type and high pressure resistant type. series. According to the national instrument series type spectrum, no matter which series, there are 12 calibers from 1 mm to 100 mm at most, and the measurable flow range is: liquid (water) 0.1 ml/min～40 cubic meters/ Hour, gas (air) 1 ml/min ~ 1000 cubic meters/hour. The glass rotor flowmeter used for environmental protection instruments generally has a caliber of no more than 10 mm, and the measured flow is in the small flow range.3. Scale correction of glass rotameter:The scale of the glass rotor flowmeter is calibrated by the manufacturer using water and dry air that are close to ideal fluids as the medium under the conditions of the factory. However, there are two situations where the scale value of the flowmeter cannot be used directly: one is that the measuring medium is not water and air, and the other is that although the medium is water and air, its state (temperature, pressure) and scale are measured. The status is different. In this way, when using the flowmeter, in order to obtain the correct measurement result, there is a problem that the scale value needs to be corrected. Therefore, it is the key to make good use of this kind of meter to solve the calibration correction of the glass rotameter.4. Summary:Considering that environmental protection instruments use glass rotameters, and anticorrosive glass rotameters are used to measure the flow of gaseous media in a large amount, the following discussion only discusses the density correction when measuring gaseous media. Since the viscosity of the gas medium is very small, the influence of viscosity will be omitted in the discussion. Practice has proved that this does not affect the accuracy after correction.
Post time: 21-09-21