Accuracy of Glass Tube Rotameter

　　The laboratory rotameter can be calibrated to an accuracy of 0.50% AR within the range of 4:1. The accuracy of industrial rotameters is slightly worse; usually 1-2% FS in the 10:1 range. For purge and bypass applications, the error is about 5%.

　　You can manually set the flow rate, adjust the valve opening while observing the scale to calibrate the process flow; when calibrating for a specific process under the same operating conditions, the rotameter can provide repeatable measurement values ​​with an error of 0.25 of the actual flow rate Within %.

　　The Glass Tube Rotameter will not change much with small changes in viscosity, although it depends on the design: very small rotameters that use balls to measure are the most sensitive, while larger rotameters are less sensitive. If the rotameter exceeds its viscosity limit, the viscosity reading needs to be corrected; usually, the viscosity limit is determined by the material and the shape of the float, and the rotameter manufacturer will provide the limit.

　　The Glass Tube Rotameter does depend on the density of the fluid; if this is likely to change, you can use two floats, one depends on the volume and one is used to correct the density. Generally, if the density of the float matches the density of the fluid, the change in density due to buoyancy will be more important, and the position of the float will change more; mass flow rotameters are most suitable for low-viscosity fluids, such as raw sugar juice, gasoline, and air jets. Fuel and light hydrocarbons.

　　The upstream pipeline configuration should not affect the flow accuracy; nor should the flowmeter be installed behind the elbow in the pipeline. Another advantage is that because the fluid is constantly flowing through the rotameter, it should be kept clean and free of debris; however, the clean fluid should be used for this purpose, without particulate matter or may cover the pipe wall, which will cause the rotor to flow The meter became inaccurate and ultimately unusable.

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