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In industries like petrochemical, water treatment, metallurgy, and power generation, flow measurement plays a vital role. Among various flow meters, the metal tube rotameter stands out for its simple design, strong adaptability, clear display, and high resistance to pressure and temperature.
But when facing a wide range of models and parameters, many users feel overwhelmed:
What flow range should I select?
Can it handle my fluid type?
What's the difference between a mechanical and a smart version?
Can it connect to my monitoring system?
Don't worry — this guide will walk you through how to select the right metal tube rotameter for your application.
A metal tube rotameter (also called a metal variable area flow meter) is a flow measurement device that uses a float moving up and down inside a tapered metal tube. The float position is proportional to the flow rate and is indicated through a mechanical pointer or a digital display.
Advantages include:
Simple structure, low maintenance
No external power needed (mechanical type)
Smart version available with output signal
Suitable for high-pressure, high-temperature, and corrosive media
Flexible for different installation conditions
Start by identifying the medium:
Is it a liquid or a gas?
Is it corrosive?
Does it contain particles, solids, or is it viscous?
For standard fluids, stainless steel (304 or 316) is suitable.
For corrosive fluids, consider materials like PTFE lining, Hastelloy, or titanium.
For viscous or particle-filled fluids, add filters or use custom internal structures to avoid float blockage.
Tip: Always provide the fluid name, concentration, temperature, and pressure for accurate selection.
Ensure the instrument works within its optimal measuring range. You'll need to know:
The normal working flow rate
The maximum and minimum flow rates
The flow unit (e.g., m³/h, L/min, Nm³/h, kg/h)
Choosing the wrong range could lead to inaccurate readings or instrument malfunction.
While metal rotameters can handle high-pressure and high-temperature conditions, actual parameters matter.
For high-pressure gases, reinforced body designs are required.
For high-temperature liquids, use heat-resistant seals and materials.
For low-temperature environments, ensure the meter won't freeze or stick.
Standard models typically handle up to 6.3 MPa and 200°C. Custom versions are available for extreme conditions.
The most common installation is vertical upward flow, which suits standard designs.
If you need horizontal or downward installation, special structures may be needed.
Improper orientation can lead to inaccurate readings or float jamming — be sure to confirm the direction during selection.
Your needs will determine whether to choose a basic or advanced model.
If you only need local reading, a mechanical pointer type is simple and doesn't require power.
If you need digital display or remote monitoring, a smart version with LCD and signal output is more suitable.
If you want alarm or control functions, select a model with switch outputs or programmable alarms.
Available signal outputs include:
4–20mA current output (widely used)
HART or Modbus communication protocols
Relay (switch) output for alarm
Pulse output (upon request)
If your environment is wet, dusty, or outdoor, choose models with IP65 or higher protection.
If youre installing in a hazardous zone, select an explosion-proof version.
If your flow fluctuates sharply, add a damping device or stabilizing valve.
If your piping uses non-standard flanges, clarify whether it's DIN, ANSI, or JIS.
If space is limited, go for a compact or offset-mounted model.
Although the metal tube rotameter looks simple, its selection involves many factors—medium type, flow rate, pressure, temperature, output, and installation.
✨ Still unsure which model suits your needs?
Just contact us with your application details — our engineers will help you select the best model and provide a full quote.
Contact Us
Email: Dora.chen@fvluoky.com
Website: https://www.fandvgroup.com/
