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Variable Area Flow Meters

Variable Area flow meters measure volumetric flow of liquids and gases. This technology is based on the variable area principle, where flow raises a float in a tube, increasing the area for passage of the fluid through the meter.

Variable Area Flow Meters

High Performance in Demanding Applications. Low Cost of Operation.

Hedland Variable Area flow meters provide a quick, visual flow indication on an easy-to-read linear scale to confirm that flow systems are operating properly.

  • Enhanced Reliability. Feature an impressively readable design that makes these meters a suitable option to monitor a wide range of liquids, fluids and emulsions. 
  • Low Cost of Operation. Designed for easy installation and minimal maintenance over the course of the long life expectancy.
  • Durable Construction. Built to withstand demanding applications in fluid power, oil and gas, automotive, semiconductor, mining and discrete manufacturing. 

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How It Works

  • Measuring Principle
Measuring Principle
Measuring Principle

Variable area meters measure volumetric flow of liquids and gases. An orifice is positioned within the piston assembly and forms an annular opening with the contoured metering cone. The piston assembly carries a cylindrical ceramic magnet that is coupled to an external flow indicator that moves precisely in direct response to the piston movement. A calibrated spring opposes flow in the forward direction, decreasing viscosity sensitivity.

How Hedland Variable Area Flow Meters Work
How Hedland Variable Area Flow Meters Work

Featured Product Lines

Hedland

Hedland®

Our line of Hedland® products features over 18,000 inline variable area flow meters suitable for oil, phosphate esters, water, water-based liquids and compressed gases. Capable of operating in any position in high-temperature and corrosive applications, Hedland® meters are easy to read and built for use in rugged environments.

Products

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EZ-View® Flow Meter
Size Range
12.7...50.8 mm
1/2...3 in.
Temperature Range
0...121 °C
32...250 °F
Flow Range
1...380 lpm
0.5...275 gpm
Accuracy
±5%
±5%
Petroleum Fluid Meter
Size Range
6...80 mm
1/4...3 in.
Temperature Range
-29…116 °C
-20…240 °F
Flow Range
0.1…1100 lpm
0.02...300 gpm
Accuracy
±2% (1/4 in. is +7%)
±2% (1/4 in. is +7%)
Water-Based Fluid Meter
Size Range
6...80 mm
1/4…3 in.
Temperature Range
-29…116 °C
-20...240 °F
Flow Range
0.1…1100 lpm
0.02...300 gpm
Accuracy
±2% (1/4 in. is +7%)
±2% (1/4 in. is +7%)
Water and Other Fluid Meter
Size Range
6...80 mm
1/4…3 in.
Temperature Range
-29…116 °C
-20...240 °F
Flow Range
0.1…1000 lpm
0.02...275 gpm
Accuracy
±2% (1/4 in. is +7%)
±2% (1/4 in. is +7%)
Air and Compressed Gas Meter
Size
6...80 mm
1/4...3 in.
Temperature Range
-29...116 °C
-20...240 °F
Flow Range
0.2...1130 l/sec
0.5...2200 scfm
Pressure Range
Up to 103 bar
Up to 1500 PSI
API Oil/Caustic and Corrosive Liquid Meter
Size Range
6...40 mm
1/4…1 1/2 in.
Temperature Range
-29…116 °C
-20...240 °F
Flow Range
0.5…380 lpm
0.01...100 gpm
Accuracy
±2% (1/4 in. is +7%)
±2% (1/4 in. is +7%)
Caustic and Corrosive Air/Gas Meter
Size Range
6...40 mm
1/4…1 1/2 in.
Temperature Range
-29…116 °C
-20...240 °F
Flow Range
1…350 lpm
2...800 scfm
Accuracy
±2% (1/4 in. is +7%)
±2% (1/4 in. is +7%)
Phosphate Ester Fluid Meter
Size Range
6...40 mm
1/4…1 1/2 in.
Temperature Range
-29…116 °C
-20...240 °F
Flow Range
0.1…560 lpm
0.02...150 gpm
Accuracy
±2% (1/4 in. is +7%)
±2% (1/4 in. is +7%)

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