Glass Rotameter Installation, Principles of Glass Rotameter
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 flowmeter in use, it is recommended to select the LZB / LZJ LZB / LZJ series glass rotor flowmeter for the common flow rate of the measured fluid.
属于瞬时流量测量仪表。 Glass rotor flowmeters are instantaneous flow measuring instruments. Because of its simple use and installation, convenient structure and reading, low price, it is more convenient and intuitive than other meters. Therefore, it is widely used in various industrial departments and scientific research units. The glass rotor flowmeter can be divided into eight types: ordinary type, ribbed vascular type, micro flow and small outline type, corrosion resistance type, laboratory type, thermal insulation type, alarm type and high pressure resistance type. Common glass rotor flowmeters are widely used in chemical, petroleum, light industry, pharmaceutical, environmental protection, food and metrology testing, scientific research and other departments to measure the flow rate of single-phase non-pulsating fluids (liquid or gas). Corrosion-resistant glass rotor flowmeter has strong corrosion resistance, can detect the flow of acids (except hydrofluoric acid), alkali, oxidants and other corrosive gases or liquids, suitable for chemical, pharmaceutical, papermaking, sewage treatment and other industries . 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.
的选型可从以下几个方面考虑。 2. The selection of glass rotor flowmeter can be considered from the following aspects.
1. Select 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. 2. The object of measurement. That is to measure the type of medium, pressure, and chemical properties. High or low temperature and so on. For example, whether liquid medium or gas medium is corrosive. For corrosive medium, anti-corrosive glass rotor flowmeter should be selected. 3. 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, good interchangeability