Selection and installation of Roots flowmeter

There are many product types of Roots flowmeters. It is very important to choose a flowmeter reasonably according to the characteristics and usage requirements of the measured medium. 1. Selection of Roots Flowmeter The selection of Roots flowmeter should consider the following three aspects: the type of flowmeter, the performance of the flowmeter, and the supporting equipment of the flowmeter. The selection of the type of Roots flowmeter should be carried out according to the actual working conditions and the characteristics of the measured medium. The following five elements should be considered in the performance selection of waist wheel gas flowmeter: 1. Flow range; 2. Measurement accuracy; 3. Pressure resistance (working pressure) 4. Pressure loss; 5. Applicable purpose. Second, the flow range of the Roots flowmeter The flow range of the Roots flowmeter is related to the applicable characteristics (continuous work or intermittent work), measurement accuracy and other factors. The same waist wheel gas flowmeter, when used for intermittent measurement, has a larger flow range (mainly, the upper limit flow rate can be larger than that in continuous operation); for measurement accuracy, when used for low-accuracy measurement, its flow range is larger , while for high-accuracy measurements, the flow range is smaller. In order to maintain the good performance and long service life of the instrument, it is best to choose a working flow that does not exceed 70% to 80% of the maximum flow of the instrument. 3. Measurement accuracy of Roots flowmeter Roots flowmeter is one of the flowmeters with high measurement accuracy at present. The measurement accuracy given by the manufacturer on the product sample refers to the basic error obtained under the laboratory reference conditions, and in actual use due to the deviation of the field conditions, additional errors will inevitably be brought. The actual error is the basic error and Synthesis of additional errors. Therefore, measures should be taken according to the problems that may arise in the field when selecting the instrument. The major influences of site conditions on the measurement accuracy are the influence of the viscosity of the measured medium and the influence of temperature.
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