How do Plastic Rotameters Flow Meters Work?
A plastic rotameter, also known as a variable area flow meter, is a type of flow meter that uses the principle of the variable area to measure the flow rate of liquids and gases. The flow meter consists of a tapered plastic tube (also known as the metering tube) with a float inside. As the liquid or gas flows through the metering tube, it causes the float to rise or fall, depending on the flow rate. The position of the float within the metering tube is directly proportional to the flow rate of the liquid or gas.
The working principle of a plastic rotameters flow meters can be broken down into the following steps:
- Flow through the metering tube: The liquid or gas flows through the metering tube, causing the float to rise or fall depending on the flow rate.
- Movement of the float: As the liquid or gas flows through the metering tube, the float moves up or down within the metering tube. The movement of the float is directly proportional to the flow rate of the liquid or gas.
- Measurement of the float position: The position of the float within the metering tube is measured by a visual indicator, such as a scale or pointer, that is located on the outside of the metering tube. The indicator shows the flow rate of the liquid or gas.
- Calculation of the flow rate: The flow rate of the liquid or gas is calculated by using the position of the float within the metering tube and a calibration factor. The calibration factor is determined by measuring the flow rate of a known quantity of liquid or gas through the metering tube and comparing it to the position of the float.
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