Water Rotameter is a simple industrial flow meter that can measure the flow rate of liquid or gas in a closed pipe. Rotameters are popular because they have a linear scale, a relatively large measuring range, low-pressure drop, and are easy to install and maintain. Rotameters are a subset of flow meters called variable area flow meters, which measure flow by allowing fluid to flow through a tapered tube. The cross-sectional area of ​​the tapered tube gradually changes as the fluid flows through the tube. Big. The flow rate in the rotameter is measured using afloat, which floats the fluid according to the buoyancy and velocity of the fluid corresponding to gravity, and pulls the float downward. For gas, the float only responds to speed, and the buoyancy is negligible.

　　The float moves up and down in the tapered tube of the rotameter, proportional to the flow of the fluid. Once the fluid and gravity are equal, it reaches a constant position. The change of flow rate will cause the float of the rotameter to change the position in the tube. Since the position of the float is based on gravity, it is important that all Acrylic Flow Meters are installed vertically and positioned with the widest end of the cone at the top. It is also important to remember that if there is no flow, the float will sink into the bottom of the rotameter due to its own weight.

　　The operator reads the flow rate from the scale on the side of the rotameter, which has been calibrated to a specific fluid with a known specific gravity. The specific gravity or the weight of the fluid has a great influence on the accuracy and reliability of the rotameter. All of Global Water's rotameters have been calibrated using water with a specific gravity of 1.0 as the standard fluid.

　　By understanding the basic operating principles, the rotameter can be calibrated for other fluids. The accuracy of the rotameter depends on the accuracy of the pressure, temperature, and flow control during the initial calibration. Any change in the density and weight of the float will affect the flow reading of the rotameter. In addition, any changes that affect the fluid (such as pressure or temperature) will also affect the accuracy of the rotameter. In view of this, the rotameter should be calibrated annually to correct any changes that may occur in the system.

　　Compared with more complex flow meters, Water Rotameter has several advantages, including:

　　Rotameters can be installed in areas where there is no power source because they only need the properties of fluid and gravity to measure flow. Therefore, when you install the flowmeter in areas with flammable liquids or gases, you don’t have to worry about ensuring that the instrument is explosion-proof Sex.

　　Rotameters can be installed on existing pipes through standard pipe fittings, or they can be mounted on panels. You don't have to worry about the straight section of the pipeline like an electromagnetic flowmeter or a turbine flowmeter.

　　The rotameter is a simple device that can be mass-produced using cheap materials, thereby reducing investment costs.

　　The line of sight of the rotameter is like a sight glass, telling the operator that the filter needs to be cleaned, and there are other problems that can cause the water to change color, or that the fluid is actually flowing. Using a transparent rotameter, they can immediately see if there is any buildup on the float or pipe wall.

　　With properly maintained rotameters, operators can expect continuous high repeatability.

　　Rotameter provides a wide range of flow measurement or measuring range. It can be expected that the ratio of the maximum flow to the minimum flow is usually 10:1. The operator will be able to measure the minimum flow, which is only 1/10 of the maximum flow of the rotameter, without compromising repeatability.

　　The scale of the rotameter is linear because the flow measurement is based on area changes. This means that the flow rate can be read with the same accuracy over the entire range.

　　Since the area of ​​the rotameter increases with the increase in flow rate, the pressure loss caused by the rotameter is extremely small and relatively constant. This leads to reduced pumping costs.

　　When using a rotameter, some disadvantages should also be kept in mind:

　　Since gravity plays a key role in flow measurement, the rotameter must always be installed vertically and make the fluid flow upward.

　　The scale on the side of the rotameter is only valid for the specific fluid and conditions used during calibration. The specific gravity of the fluid is the main attribute to consider, but the viscosity of the fluid and any temperature changes may also be important. Rotor floats are usually designed to be insensitive to viscosity, but the operator should verify that all rotameters installed in the system have been calibrated for their specific settings before providing flow measurements.

　　Although magnetic floats may be used in some cases, rotameters are difficult to be read by machines.

　　Rotameters are usually made of transparent materials, but before complete installation, all operators should check the chemical compatibility of the flowmeter with its fluid.