的主要测量元件为一根垂直安装的下小上大锥形玻璃管和在内可上下移动的浮子。 The main measuring element of the glass rotor flowmeter is a vertically mounted lower and upper conical glass tube and a float that can move up and down inside.
The main reasons for glass rotor flowmeters are as follows:
Generally speaking, in flow measurement instruments, except for volumetric instruments, which do not require too much fluid state, other instruments generally require the fluid to be as stable as possible (preferably laminar flow state) so that the measurement results can be more accurate. And stable. Therefore, try to leave a long enough straight pipe section on the upstream side of the flow meter (straight pipe section refers to a pipe with the same diameter as the flow meter, and cannot contain elbows, tees, valves, etc.). If there is a valve, it is generally installed in the Downstream of the flowmeter, so as not to affect the measurement of the flowmeter (the most direct impact is the large fluctuation of the indication of the instrument). If it must be installed upstream, the valve should be opened as far as possible to eliminate the impact on the measurement of the flowmeter to the greatest extent.
的选用可从以下几个方面考虑。 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. Choose according to 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. The glass rotor flowmeter is a kind of instantaneous flow measuring instrument which is simple to use, convenient to read and very versatile. Anhui Secco environmental flowmeters and meters need to consider the requirements of the measurement medium for the selection of flowmeter products. For example, the selection of electromagnetic flowmeters will be more specific and detailed. More knowledge can be stored in this station, which is convenient for later. Information understanding and price attention.
在使用安装前，应先检查其技术参数如：测量范围，精确度等级，额定工作压力，温度等参数是否符合使用要求。 Before using the glass rotor flowmeter , check its technical parameters such as: measurement range, accuracy level, rated working pressure, temperature and other parameters that meet the requirements for use. Before installation, the top lining for transportation protection should be removed. And check the cone tube for damage, whether the float can move up and down freely, and it can be installed only after it is normal. The newly installed pipeline should be flushed before the glass rotor flowmeter is installed. The minimum graduation value of the rotor flow meter should be below and installed vertically on the pipeline without vibration. The angle between the center line of the rotor flow meter and the plumb line should not exceed 5 degrees. Large-caliber flowmeters are heavy. To avoid pipe bending, measures such as reinforcement and support can be taken if necessary. It is also necessary to prevent the rotor flowmeter from being subjected to excessive tension, pressure, and torque during installation. So as not to generate excessive external force and damage the tapered tube. According to different working conditions in use, if necessary, a filter should be installed upstream of the rotor flowmeter to prevent contamination by impurities and block the rotor flowmeter. If the fluid is unstable and has a pulsating flow, a buffer can be installed to ensure the good measurement of the rotor flow meter to eliminate the pulsating flow. When the rotor flowmeter is in use, first slowly open the control valve on the upstream pipe of the flowmeter, and then use the regulating valve to adjust the flow rate, so as to avoid the sudden rise of the float to cause damage to the cone tube. In order to ensure the measurement accuracy of the rotor flow meter in use, it is recommended that the common flow rate of the measured fluid be selected to be more than 60% of the upper limit value of the flow rate of the rotor flow meter.
This data is provided for free by Jiangsu Jinhu Dongxiang Instrument Factory