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Applications and Usage of Metal Tube Variable Area Flowmeters
Time：
2025-05-29
Metal tube variable area flowmeters, commonly known as metal tube rotameters, are widely used in industrial process control due to their durability, reliability, and ability to handle harsh operating conditions. Unlike glass rotameters, which are limited by pressure and temperature, metal tube models are robust and can operate in demanding environments where safety and performance are critical.
How It Works
The metal tube variable area flowmeter operates based on the variable area principle. As fluid flows through a tapered metal tube, it lifts a float. The height of the float corresponds to the flow rate, which is indicated either through a magnetic follower connected to an external scale or via electronic signal output. This design allows for precise, real-time flow measurement of gases, liquids, and even steam.
Key Advantages
High Durability: Made from stainless steel or corrosion-resistant alloys, ideal for aggressive or high-pressure media.
Wide Operating Range: Suitable for flow measurement in systems with pressures up to 40 MPa and temperatures up to 400°C.
Multiple Output Options: Available with analog (4-20 mA), HART, or digital output for easy integration with control systems.
No External Power Required (for Mechanical Types): Useful in remote or hazardous locations.
Typical Applications
Chemical and Petrochemical Plants
Used for measuring corrosive and toxic media where safety and rugged construction are essential.
Water Treatment Facilities
Ideal for measuring process water, dosing chemicals, or monitoring flow in filtration systems.
Oil & Gas Industry
Applied in flow measurement of fuel, lubricants, and compressed gases in both upstream and downstream operations.
Power Plants
Measures the flow of cooling water, steam, and other critical utilities in power generation systems.
Pharmaceutical and Food Processing
In hygienic versions, used for flow monitoring of clean fluids, including process water and additives.
Installation and Maintenance Tips
Mounting: Usually installed vertically with the flow direction from bottom to top.
Calibration: Should be calibrated for the specific fluid and flow range of the application.
Maintenance: Periodic cleaning and inspection of the float and tube are recommended, especially in systems with particulate-laden fluids.
The metal tube variable area flowmeter is a versatile and reliable tool for flow measurement in industrial applications. Its robust design, combined with flexible output and installation options, makes it an ideal choice for industries that demand accuracy, safety, and performance under tough conditions.
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