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GT1000 Series Glass Tube Variable Area Flow Meters

Simple design. Rugged performance for high flow rates.
Models 1020N / 1024N / 1026N / 1027N

The GT1000 Series glass tube VA flow meter from Brooks Instrument is easy to read and uses simplicity of design with rugged, long-lasting flow measurement performance for a wide range of high-flow gas and liquid applications where viewing the process is important.

Featuring a clear and easy-to-read scale, the GT1000 Series O-ring seal design minimizes process downtime by allowing for convenient in-line removal of the glass tube for cleaning and maintenance. Reliable, with only one moving part, it is globally approved for use in hazardous environments.

Questions?

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Call: 1-888-554-3569

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Features

  • Wide range of flow ratings
  • Operating temperature range 33 to 125°F (1°C to 52°C)
  • Pressure ratings up to 500 psig / 34 bar
  • Two accuracy levels to choose from: 2% or 1% Full Scale
  • Optional high and low-flow reed switch or inductive alarm, also for safe use in explosive hazardous areas
  • Calibrated to process conditions with 127mm or high resolution 250mm direct reading scales
  • Brass or 316L stainless steel end fittings
  • Flanged or threaded connections
  • Horizontal or vertical connections
  • Horizontal end fittings 360° rotatable
  • 180° viewing window
  • Rugged, vented polycarbonate enclosure available on most models

Benefits

  • Tube and float can be re-ranged in line, minimizing process downtime
  • Rotatable connections for easy installation at any angle
  • Packing gland or O-ring sealing to meet piping requirements or customer preference
  • No power required; reduces installation cost and provides flow measurement in hazardous areas
  • Low-pressure drop allows for economical pump selection
  • Optional needle valve mounted to inlet or outlet for setting the desired flow
  • Optional economical brass fittings for delicate applications (e.g. avoidance of hydrogen embrittlement)

Applications

  • Industrial processes
  • Pharmaceutical production
  • Oil and gas pumping and refining processes
  • Chemical manufacturing
  • Burner control
  • Water treatment and distribution systems
Product Type

Glass Tube VA Flow Meter

Applications:  Clean liquids and gases

Differentiator

Removable borosilicate glass metering tube for easy service without removing the meter, minimize downtime

Process connections can be rotated 360°, 180° viewing window, panel mount option

One or two flow alarms are available, alarms are safe use in explosive atmospheres

Reliable o-ring seal design for leak free process connections

Optional needle valves mounted to inlet or outlet for precision flow control

Performance
Flow Range (Full Scale Capacity)

Water
98 gpm / 22,000 lph

Air
270 scfm / 440 m3n/hr

See Capacity Tables in Data Sheet

Pressure Drop
See Capacities & Pressure Drop Tables in Data Sheet
Accuracy

+/- 2% Full Scale  /  Class 2.5 VDI /  VDE

+/- 1% Full Scale  / Class 1.6 VDI  /  VDE

Repeatability

Less than 0.5% Full Scale

Mechanical
Metering Tube Material

Borosilicate Glass

 

Scales
Single or Dual Detachable Aluminum Plate
Scale Length
127mm, 200mm and 250mm
Scale Graduations
Choice of direct reading units, millimeter or percentage of maximum flow with factor tag.
Window Material

Polycarbonate with UV Inhibitor

 

Float Material

Size 2 and 6:  Glass, Sapphire, Carboloy, 316 Stainless Steel

Size 7:  Glass, 316 Stainless Steel

Size 8 to 13:  316 Stainless Steel

Float Stops
Sizes 2 through 13:  Teflon
Housing
Cast Aluminum with Epoxy Paint Coating
End Block Options
Brass or 316 Stainless Steel (1.4404)
O-Ring Materials

Viton® fluoroelastomer

Buna-N

Kalrez® 4079 fluoroelastomer

EPDM

Connection Materials
Brass or 316 Stainless Steel (1.4404)
Process Connections

Brass Construction:  NPT, BSPT / Rc Female connections

316 Stainless Steel Construction:  NPT, BSPT / Rc Female connections or 150# Flanges per ASME B16.5

Optional Equipment
Ratings
Max Pressure
Refer to Maximum Pressure Ratings Table in Data Sheet
Max Temperature
121oC (250oF)
PED Categories

See PED Categories Table in Data Sheet

Sizes 2 through 10 meet PED Category SEP

Sizes 12 & 13  do not conform to PED

Ambient Temperature Range
33 to 125°F  /  1 to 52°C
Fluid Temperature Range

Meter

33 to 250°F  /  1 to 121°C

Alarm Option

Reed Switch: 33 to 250°F  /  1 - 121°C

Inductive Switch: 33 to 167°F  /  1 - 75°C

Diagnostics & Display
Alarms

Reed Switch - Sizes 7 to 13

Inductive Switch - Sizes 2 & 6

Compliance
Certifications/Approvals

International Calibration Certificate (ICC)

Material certification

Pressure Test certificate

Oxygen Cleaning certificate

Certificate of Conformance

1020N

1024N

 

1026N 1027N
Differentiator

Horizontal inlet & outlet connections

Vertical inlet & outlet connections

Horizontal inlet & vertical outlet connections

Vertical inlet & horizontal outlet connections

Fluid Type

Clean Liquids

Gas

Clean Liquids

Gas

Clean Liquids

Gas

Clean Liquids

Gas

Flow Range (Full Scale Capacity)

Flow Range - Water:  98 gpm / 22,000 l/h

Flow Range - Air:  270 scfm / 440 m3n/hr

Flow Range - Water:  98 gpm / 22,000 l/h

Flow Range - Air:  270 scfm / 440 m3n/hr

Flow Range - Water:  98 gpm / 22,000 l/h

Flow Range - Air:  270 scfm / 440 m3n/hr

Flow Range - Water:  98 gpm / 22,000 l/h

Flow Range - Air:  270 scfm / 440 m3n/hr

Accuracy

+/- 2% Full Scale  /  Class 2.5 VDI /  VDE

+/- 1% Full Scale  / Class 1.6 VDI  /  VDE

+/- 2% Full Scale  /  Class 2.5 VDI /  VDE

+/- 1% Full Scale  / Class 1.6 VDI  /  VDE

+/- 2% Full Scale  /  Class 2.5 VDI /  VDE

+/- 1% Full Scale  / Class 1.6 VDI  /  VDE

+/- 2% Full Scale  /  Class 2.5 VDI /  VDE

+/- 1% Full Scale  / Class 1.6 VDI  /  VDE

 

Temperature Range

Meter

33 to 250°F  /  1 to 121°C

Alarm Option

Reed Switch: 33 to 250°F  /  1 - 121°C

Inductive Switch: 33 to 167°F  /  1 - 75°C

Meter

33 to 250°F  /  1 to 121°C

Alarm Option

Reed Switch: 33 to 250°F  /  1 - 121°C

Inductive Switch: 33 to 167°F  /  1 - 75°C

Meter

33 to 250°F  /  1 to 121°C

Alarm Option

Reed Switch: 33 to 250°F  /  1 - 121°C

Inductive Switch: 33 to 167°F  /  1 - 75°C

Meter

33 to 250°F  /  1 to 121°C

Alarm Option

Reed Switch: 33 to 250°F  /  1 - 121°C

Inductive Switch: 33 to 167°F  /  1 - 75°C

Max Pressure Refer to Maximum Pressure Ratings Table in Data Sheet Refer to Maximum Pressure Ratings Table in Data Sheet Refer to Maximum Pressure Ratings Table in Data Sheet Refer to Maximum Pressure Ratings Table in Data Sheet
Scale Length 127mm, 200mm and 250mm 127mm, 200mm and 250mm 127mm, 200mm and 250mm 127mm, 200mm and 250mm
Wetted Materials Brass or 316 Stainless Steel (1.4404) Brass or 316 Stainless Steel (1.4404) Brass or 316 Stainless Steel (1.4404) Brass or 316 Stainless Steel (1.4404)
Process Connections

Horizontal Inlet & Outlet

Brass Female Connections:  NPT, BSPT / Rc Female

316 Stainless Steel:  NPT, BSPT / Rc Female connections or 150# Flanges per ASME B16.5

Vertical Inlet & Outlet

Brass Female Connections:  NPT, BSPT / Rc Female

316 Stainless Steel:  NPT, BSPT / Rc Female connections or 150# Flanges per ASME B16.5

Horizontal Inlet & Vertical Outlet

Brass Female Connections:  NPT, BSPT / Rc Female

316 Stainless Steel:  NPT, BSPT / Rc Female connections or 150# Flanges per ASME B16.5

Vertical Inlet & Horizontal Outlet

Brass Female Connections:  NPT, BSPT / Rc Female

316 Stainless Steel:  NPT, BSPT / Rc Female connections or 150# Flanges per ASME B16.5

Alarms

Reed Switch - Sizes 7 to 13

Inductive Switch - Sizes 2 & 6

Reed Switch - Sizes 7 to 13

Inductive Switch - Sizes 2 & 6

Reed Switch - Sizes 7 to 13

Inductive Switch - Sizes 2 & 6

Reed Switch - Sizes 7 to 13

Inductive Switch - Sizes 2 & 6

Certifications/Approvals

International Calibration Certificate (ICC)

Material certification

Pressure Test certificate

Oxygen Cleaning certificate

Certificate of Conformance

International Calibration Certificate (ICC)

Material certification

Pressure Test certificate

Oxygen Cleaning certificate

Certificate of Conformance

International Calibration Certificate (ICC)

Material certification

Pressure Test certificate

Oxygen Cleaning certificate

Certificate of Conformance

International Calibration Certificate (ICC)

Material certification

Pressure Test certificate

Oxygen Cleaning certificate

Certificate of Conformance

FilenameFile TypeDocuments By Language
Data Sheet pdf English
Installation & Operation Manual pdf English
Quick Start Guide pdf English