Variable area Flowmeters | Rotameters

How does a variable area flowmeter work?

Variable area flowmeter, often called Rotameter, work by moving a float in a conical measuring tube that is mounted vertically. This measurement method provides a quick and easy reading of the flow, which is particularly beneficial in applications that require continuous monitoring and high precision. The float adjusts to the flow rate and allows easy reading directly on the scale. This technology provides an accurate and clear picture of the flow, which is critical in many different types of industries - from water treatment to chemical production.

 

Why choose Omniprocess variable area flowmeter?

High Precision

Our variable area flowmeters deliver results with very high accuracy. Whether you're measuring air, water or special liquids, you can rely on getting precise readings.

Customizable

With a wide range of materials such as stainless steel, titanium and various plastics, our flowmeters can be customized for different media and processes.

Wide flow range

We offer flowmeters covering everything from small gas flows of 5 ml/min up to large industrial flows of 1000 m³/h. This allows us to meet the needs of a wide range of customers, regardless of the size of their application.

Our range of variable area flowmeters

RAMC metal

Field of applicationDesigned for high flow rates in demanding environments such as the chemical and process industries, where robustness and high accuracy are essential.

Technical specifications:

• Media-related elements: SS 316 Ti or PTFE

• Flow areas: Water (20°C): 2.5 l/h to 130 m³/h; Air (20°C, 1 bar a): 75 l/h to 1400 m³/h

• Measurement uncertainty: ±1.6 % of the measuring range

• Process connection: Flange, thread or hygienic

• Process temperature: -200°C to +370°C

• Process printing: -1 to +700 bar

• Output signal: 4-20 mA/HART, Pulse, Profibus PA, limits with NAMUR switch

• AuthorizationATEX, IEC, SIL

• Swedish product flyers: RAMC large flows

RAKD metal

Field of applicationIdeal for measuring small flows in applications such as laboratories and research environments, where precision at low flows is essential.

Technical specifications:

• Media-related elementsSS 316 Ti

• Flow areas: Water (20°C): 0.1 to 250 l/h; Air (20°C, 1 bar a): 4 l/h to 8 m³/h

• Measurement uncertainty: ±4 % of the measuring range

• Connectivity: Flange or thread

• Process temperature: -25°C to +250°C

• Process printing: -1 to +160 bar

• Output signal: 4-20 mA, limit values with NAMUR switch

• AuthorizationATEX, IEC, SIL

• Swedish product flyers: RAKD small flows

RAGN glass tubes

Field of application: Suitable for applications that require visual monitoring of the flow, for example in water treatment and food industry.

Technical specifications:

• Media-related elements: PTFE, PVDF, SS316, Titanium

• Flow areas: Water (20°C): 0.002 l/h to 10 m³/h; Air (20°C, 1 bar a): 0.1 l/h to 160 m³/h

• Measurement uncertainty: ±1.6 % to ±2.5 % of the measuring range

• Connectivity: Thread, Flange or Hygienic

• Process temperature: -25°C to +100°C

• Process printing: -1 to +16 bar

• Output signal: Limit values

• AuthorizationATEX, IEC, SIL

RAGK glass tubes

Field of application: Suitable for measuring small to medium flows in applications where compact design and ease of installation are important, such as in laboratories and pilot plants.

Technical specifications:

• Media-related elements: PP, PVDF, SS316, Titanium

• Flow areas: Water (20°C): 0.002 to 630 l/h; Air (20°C, 1 bar a): 0.2 l/h to 6300 l/h

• Measurement uncertainty: ±2.5 % of the measuring range

• Connectivity: Thread

• Process temperature: -25°C to +130°C

• Process printing: -1 to +16 bar

• Output signal: Limit values

• AuthorizationATEX, IEC, SIL

NG series float gauges with glass tube

Field of application: Used for measuring small flows in applications such as gas analysis and laboratory processes, where high precision and compact design are necessary.

Technical specifications:

• Material: Brass or acid-proof stainless steel

• Flow areas: Air: 5-100 ml/min to 10-100 l/min; Water: 2-25 ml/min to 0.4-4.4 l/min

• Maximum pressure: 10 bar

• Maximum temperature: 100°C

• Connections: 1/4" BSP backwards on meters with valve; backwards or vertically on meters without valve

• Flow alarm GIR: Available as an accessory

GU series with safety-designed housing

Field of application: Designed for safe handling in applications requiring robust design.

Technical specifications:

• Material: Brass or acid-proof stainless steel, aluminium housing with Plexiglas window

• Maximum pressure: 16 bar

• Maximum temperature: 100°C

• Connections1/4" BSP vertical

• Flow alarm GIR: Available as an accessory

GMT/Vampire metal float gauge

Field of application: Suitable for applications requiring high strength metal pipes, such as process industries.

Technical specifications:

• Material: Brass or acid-proof stainless steel

• Flow areas: Air: 0.3-3.0 m³/h to 100-1000 m³/h; Water: 10-100 l/h to 2-25 m³/h

• Maximum pressure: 100 bar

• Maximum temperature: 200°C

• Connections: Thread or flange

• Optional: Mechanical or electronic display, 4-20 mA output signal, 1 or 2 alarm outputs

Metal Tube Purge Meter

Field of application: Used in applications that require easy reading and high durability.

Technical specifications:

• Material: Acid-proof stainless steel

• Flow areas: Air: 30-250 l/h to 160-1600 l/h; Water: 1-10 l/h to 6-60 l/h

• Maximum pressure: 100 bar (without valve), 40 bar (with valve)

• temperature: -20°C to 150°C

• Connections: 1/4" NPT female thread

Technology that puts you in control

Whether you're working with low flows in a laboratory environment or larger flows in industry, OmniProcess supplies the right tool for the job. All meters are calibrated to meet your specific requirements, and we offer fast delivery from stock for standard models.

Contact us

If you need a reliable flow measurement solution that delivers high accuracy and long life, OmniProcess is ready to help. Contact us today for a free consultation or quote and discover how our variable area flowmeters can simplify and improve your processes.