The glass rotor flowmeter is a simple flow measuring instrument with simple use, convenient reading and wide application. It can be divided into: ordinary type, reinforced vascular type, small flow and small shape, and corrosion resistance according to its application and adaptation range. Eight series of type, laboratory type, heat preservation type, alarm type and high pressure type. Therefore, it is extremely important to choose and use this instrument.
The selection of glass rotor flowmeter should pay attention to the following points:
1. Glass rotor flowmeter performance. If there is no big change in price, the needle valve is preferred to be placed on the upper part of the flow meter; for larger flow holes, it is a direct flow scale; the structure is simple; the external size is small. If it is a small flow range, the ball float type can be selected because it is stable during measurement, is not easy to accumulate dust, has high precision, and has good interchangeability.
2. According to the price. Generally speaking, the price with high precision is high. It is necessary to select the accuracy level of the meter according to the purpose of measurement. For example, it is only necessary to control the throughput of the measuring medium. After the trial operation is adjusted, the throughput must be stabilized in the future, and the accuracy is secondary.
3. The object of the measurement. That is, measuring the type of medium, pressure, and chemical properties. For liquid media and gaseous media, corrosion-resistant flowmeters should be selected for corrosive media.
Glass Rotameter Large-diameter flowmeters are heavy, in order to avoid bending of the pipeline, reinforcement measures can be taken when necessary. It is also necessary to avoid excessive pulling, pressing and twisting of the rotor flowmeter during installation. In order to avoid excessive external force and damage the cone. Depending on the operating conditions in use, a filter should be installed upstream of the rotameter to prevent contamination of the impurities and the plugged rotor flowmeter. If the fluid is unstable and has a pulsating flow, a buffer can be installed to ensure good measurement of the rotameter to eliminate pulsating flow. When the rotameter is in use, the control valve on the upstream pipe of the flowmeter should be slowly unscrewed, and then the flow rate should be adjusted by the regulating valve to avoid sudden opening of the float causing the float to rise sharply. In order to ensure the measurement accuracy of the rotameter during use, the common flow rate of the measured fluid is recommended to be 60% of the upper limit of the rotameter's indexing flow.
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