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Glass Tube Variable Area Flow Meters

Rugged. Economical. Easy to use rotameters for flow measurement technology.

When measuring liquid or gas flow at higher pressures and temperatures than is suitable for plastic, you can achieve accurate flow rates with robust glass tube rotameters (variable area flow meters) from Brooks Instrument. With a broader range of flow rates available, glass tube rotameters are suitable for a variety of liquids and gases.

Resistance to thermal shock, pressure and oxidation is the result of employing borosilicate glass tube bodies that can withstand pressures up to 13.8 bar (200 psi). Plus, corrosion-resistant material options for scales, floats, fittings and valves accommodate a variety of applications, whether in the lab or in industrial processes.

Key Applications

  • Industrial processes
  • Pharmaceutical production
  • Oil and gas pumping and refining processes
  • Fuel cell research
  • Chemical manufacturing
  • Analytical instrumentation
  • Water treatment and distribution systems

Select the glass tube rotameter that best meets your project requirements.


Sho-Rate Series
Sho-Rate Series
GT1600 Series
GT1600 Series
FC Series
FC Series
Product Type

Glass Tube VA Flow Meter


Glass Tube VA Flow Meter

Applications:  Clean liquids and gases

Manual Flow Controller

Ideal for Wide Variety of Gas & Liquid Applications


QuickShip Available

Configurable to retro-fit GT1000, GT130x and Full-View models

Rugged design for indoor or outdoor use

Durable, even in harsh or hazardous environments

Available as Standalone or Integrally Mounted to Flow Meter
Flow Range (Full Scale Capacity)


0.8 - 5 gpm

0.01 - 34 gph

0.041 - 130 lph


3.4 - 15 scfm

0.12 - 140 scfh

3.2 - 3700 nlph


4-900 ml/min

2-100 CCM

0.1-9 LPM

0.1-130 SCFH

Up to 0.41 gpm / 4,900 lph

Up to 150 scfm / 270 m3n/hr

See Capacity Tables in Data Sheet


.024 - 480 gph


.10 -2130 scfh

Accuracy ± 3% - 10% FS

Standard: ±10%, ±5%, ±2% Full Scale, Class 2.5 acc VDI/VDE

Optional: ±1% Full Scale, Class 1.6 acc VDI/VDE

Max Temperature 121oC (250oF) 121oC (250oF) 178oC (350oF)
Max Pressure 200 psig Refer to Maximum Pressure Ratings Table in Data Sheet Refer to Maximum Pressure Ratings Table in Data Sheet
O-Ring Materials

Viton-A® fluoroelastomers










Viton® fluoroelastomers





Process Connections

Horizontal female 3/8" NPT threaded adapters

1/8" - 1/4" NPT

1/8" - 1/4" Compression

6mm Compression

1/4" - 3/8"; RC

1/4" VCR®

1/4" Hose

Swagelok® Converters

316 stainless steel

1/8" - 1/4" F-NPT

1/8" - 1/4" Tube Compression

1/4" ID Hose

3/4" F-NPT

Integral connection


Tube Sizes 2 & 6: Ring Initiator High/Low Alarm

Tube Sizes 7-10: Reed Switch High/Low Alarm

Hazardous Area Approvals:

Zone 1/Zone 2 (CSA/ATEX/IECex) - gas/dust. Protection method Ex-m (no barrier).

Div 1/Div 2 (CSA) - gas/dust. Protection method I.S. / Non-incendive

Certifications/Approvals International Calibration Certificate (ICC)

International Calibration Certificate (ICC)

Material Certification to DIN 3.1

Declaration of Compliance 2.1 Oxygen Service