How to correct the scale of the glass rotor flow meter and calculate the flow meter

Abstract: How to correct the scale of the glass rotor flow meter when it is used and the information on the flow meter calculation are provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Glass rotameter is a kind of instantaneous flow measuring instrument that is easy to use, easy to read and has a wide range of uses. It is extremely important to choose and use this kind of instrument well. In environmental protection analytical instruments, laboratory flow measurement, chemical industry, machinery field. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is how to correct the scale of the glass rotor flowmeter when using it and the details of the flow meter calculation. The glass rotameter is a kind of instantaneous flow measuring instrument that is easy to use, easy to read and has a wide range of uses. It is extremely important to choose and use this kind of instrument well. In the fields of environmental protection analysis instruments, laboratory flow measurement, chemical industry, machinery and other fields, the consumption of glass rotor flowmeters reaches more than 300,000 units per year, and there are nearly 50,000 units from Liangbang. Regarding how the flowmeter reads the float reading, the following is a simple and easy-to-use method introduced by the manufacturer for your reference: eye level, read the scale on the upper plane of the rotor, starting from the 0 scale direction. The data read out on the rotameter is the instantaneous flow, either volume flow or mass flow. If it is mass flow, you first convert it into volume flow (unit m3/s), and then divide the volume flow by the cross-sectional area according to the diameter of the rotameter to estimate it (Note: This is an estimate because the cross-sectional area is not linear ) The selection of glass rotor flowmeter can be considered from the following aspects. 1. object of measurement. That is to measure the type of medium, pressure, chemical properties. Such as liquid medium, gas medium, for the corrosive medium, the corrosion-resistant flowmeter should be selected. 2. The performance of the flowmeter itself. After the above conditions are determined, generally speaking, if there is no major change in the price, the needle valve placed on the upper part of the flowmeter can be preferred; the one with a larger flow hole is a direct flow scale; the structure is simple; the external size is small, etc. . If it is a small flow range, the ball float type can be used, because it is stable during measurement, not easy to accumulate dust, has high precision and good interchangeability. 3. Choose according to the price. Generally speaking, the higher the precision, the higher the price. The accuracy level of the instrument should be selected according to the measurement purpose. If it is only necessary to control the throughput of the measuring medium, and after adjustment by the trial operation, the throughput must always be stabilized in the future, then the accuracy is secondary. 2. Calibration of glass rotameter The calibration of the glass rotameter is obtained by the manufacturer using water and dry air as medium which are close to ideal fluid under the conditions of the factory. However, in the use site of the flowmeter, there are two situations where the scale value cannot be used directly: one is that the measuring medium is not water and air, and the other is that although the measuring medium is water and air, its state (temperature, pressure) and scale Status is different. In this way, when using the flowmeter, in order to obtain correct measurement results, there is a problem that the scale value needs to be corrected. Therefore, solving the calibration correction of the glass rotameter is the key to making good use of this instrument. Considering that environmental protection instruments use a large number of rotameters to measure the flow of gaseous media, only the density correction when measuring gaseous media is discussed below. Since the viscosity of the gas medium is very small, the influence of viscosity is omitted from the discussion. Practice has proved that this does not affect the corrected accuracy. The following is the general expression of the flow rate of the rotor flowmeter. Formula (1) is a calculation formula that does not consider the influence of the viscosity of the medium. From formula (1), it can be clearly concluded that when the height of the float of a flowmeter is determined, the density of the measured mediumρIt is a variable of *. If the density of the measured medium is different, the flow rate of the medium through the flowmeter is also different. Therefore, scale correction is actually flow correction. If two different densitiesρ1,ρWhen the medium in These states are represented by two parameters, pressure and temperature, respectively. It can be seen that for the same gas medium, the density conversion can be completely converted into temperature and pressure conversion in different states. In this way, the scale correction for measuring the flow rate of the same gas medium eventually becomes the state correction of temperature and pressure (essentially density correction). Obviously, this is a correction method that is very easy to implement in general using units.

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