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The Digital Variable Area Meter | MASS-VIEW from Bronkhorst

What Is a Variable Area Meter (Purge Meter)?

traditional Variable Area Flow meter

A variable area meter, also known as a purge meter, is a flow measurement device that typically consists of a tapered tube with a float inside. The float is lifted by the fluid’s drag force and pulled down by gravity, allowing flow rate to be inferred by its position. These meters are commonly made from glass or plastic, with the float made of anodized aluminum or ceramic.

How Does a Variable Area Meter Work?

A Variable Area Meter, or rotameter, measures flow rates using a tapered tube and a float. As fluid flows through the tube, it pushes the float upwards. The float's position, which balances the fluid's upward force and gravity, indicates the flow rate on a scale marked on the tube. 
Despite their simple and cost-effective design, traditional purge meters have limitations. 
Calibration is specific to one substance, temperature, and pressure. Reading the float through the flowing medium can be difficult—especially with opaque fluids or when the meter is integrated into a machine. 

Digital Innovation: MASS-VIEW by Bronkhorst

The MASS-VIEW series by Bronkhorst offers a modern digital alternative to traditional variable area meters. By using direct thermal mass flow measurement, MASS-VIEW eliminates the need for pressure or temperature compensation. This results in more accurate and reliable readings, ideal for industrial and chemical processes.

Key Advantages of the MASS-VIEW Digital Variable Area Meter

  • Digital Variable area flow meterUses direct thermal mass flow measurement (no bypass), ensuring high accuracy without external compensation.
  • Equipped with a bright OLED display for clear, error-free readings.
  • Provides accumulated flow data for process insights and cost tracking.
  • Can be installed in any orientation, unlike traditional meters which require vertical mounting.
  • Durable aluminum construction replaces fragile glass or plastic tubes.
  • Standard outputs: 0-5V, RS-232, and Modbus-RTU, enabling easy integration with control systems.
  • Includes alarm relays for process control and safety.
  • Features 10 pre-installed gases, making it more versatile than single-purpose purge meters.
  • Wide rangeability of 1:100 compared to 1:10 for conventional VA meters.

Conclusion: A Smarter Alternative to Traditional Variable Area Meters

Whether you’re upgrading from a legacy purge meter or designing a new process line, the MASS-VIEW digital variable area meter offers unmatched flexibility, accuracy, and ease of use. Designed and manufactured in the Netherlands, MASS-VIEW supports digital connectivity and intelligent features.