Variable Area Flow Meters (Rotameters)
As one of the pioneering manufacturers in variable area (VA) flow meter (rotameter) technology, Brooks Instrument has created a diverse and proven portfolio of gas flow meters, installed and in use across virtually every industry. From inline flow meters to low volume flow meters, Brooks offers high-performance gas and water variable area flow meter technology for the broadest range of industrial flow meter applications.
This broad portfolio of industrial flow meters includes armored metal and glass tube mechanical flow meters, each engineered to provide years of repeatable, reliable measurement of gas and liquid flow rates. They feature:
- Reliable, easy-to-read displays on all mechanical flow meter types — gas, fluid and flow meters for water
- Fail-safe inline flow indication under any circumstance
- Integral flow controller to compensate for varying pressures
- Materials and designs to suit multiple pressure ranges and chemical compounds for industrial flow meters
- Field-replaceable components and custom scales
- Integration of optional flow switches, automated valves or alarms
Trust the expertise of the Brooks Instrument team for valuable insight on the right fluid flow meter for your needs. Talk to us for more on our range of industrial flow meter types for gas and water, and see why Brooks Instruments leads the world in variable area flow meters.

- Improved accuracy over plastic flow meters
- Suitable for wider flow ranges and and more gas types
Clean Gases & Liquids
Water: 98 gpm - 22,000 l/h
1-2% FS
- For use in high/low pressure and temperature applications
- Ideal for measuring fluids in hazardous, remote areas
- Simple design is easy to install and maintain
Water: 440 gpm - 100,000 l/h
Class 1.6 - 4 VDI/VDE
4 - 20mA Analog w/HART® 7
FOUNDATIONTM Fieldbus
Flow Switches
Key Applications
- Basic liquid (including water) or gas flow measurement
- Rotating equipment flow measurement
- Process analyzers
- High-pressure flow on offshore oil platforms
- Chemical injection
- Purge liquid or gas metering
Why Use a Rotameter (Variable Area Flow Meter) to Measure Gas or Liquid Flow

