GT130x Series

GT130x Series Glass Tube Variable Area Flow Meters

Efficient and cost-effective for moderate accuracy requirements. Full-View® 1100 Series replacements.

Models 1305 / 1306 / 1307

The GT130x Series glass tube VA flow meters are a family of versatile and economical meters designed for general use in applications with moderate metering accuracy requirements — typical accuracy ranges are 1% to 10% full scale, depending on the model selected. They are ideal for purge type service, seal oil systems, bearing lubrication and cooling water indication, and offer o-ring seal construction with ten-to-one rangeability, as well as a wide range of float types and capacity ranges.

The GT130x Seal Series flow meters provide an excellent and modular drop-in replacement for existing Brooks Instrument Full-View® 1100 Series meters: models 1110, 1114, 1140, 1144.


  • Broad range of flow ratings from 0.8 to 25 gpm; 3 to 50 scfm
  • Pressure ratings up to 500 psig / 34 bar
  • Accuracy ranges from 1% to 10% Full Scale
  • Calibrated to process conditions with 75mm, 127mm or high resolution 250mm direct reading scales
  • Sturdy bolted side-plate construction
  • Standard NPT or flanged connections
  • Vertical inlets and outlets standard
  • Glass containment safety sleeve ensures personal safety
  • Cost-effective accuracy combined with long-lasting repeatable measurement
  • Reliable O-ring seal design for leak-free process connections
  • Rugged side-plate construction protects glass tube from piping stress and/or vibration
  • Vertical and/or horizontal NPT or flanged connections enables easy connection with existing process piping
  • Meter inlet and outlet same size; provides positive seal that is easy to maintain
  • Optional needle valve mounted to inlet or outlet for setting the desired flow
  • Optional economical brass fittings for delicate applications (i.e. avoidance of hydrogen embrittlement)
  • 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



Less than 0.5% Full Scale


Models 1306 / 1307: +/- 1% Full Scale / Class 1.6 VDI / VDE
Models 1306 / 1307: +/- 2% Full Scale / Class 2.5 VDI / VDE
Model 1305: +/- 5% Full Scale
Model 1305: +/- 10% Full Scale

Pressure Drop

Refer to Capacities & Pressure Drop Tables in Data Sheet

Flow Range (Full Scale Capacity)

10 gpm / 2,460 lph

45 scfm / 69 m3n/hr

See Capacities Tables in Data Sheet



Drop-in replacement for the Brooks Instrument Full-View 1100 series
Rugged stainless steel construction for heavy duty applications and corrosive atmospheres
Personal safety first with glass containment safety sleeve
Optional needle valve mounted on inlet or outlet for precision flow control
O-Ring seal construction provides a positive seal and easy maintenance

Metering Tube Material

Borosilicate Glass


1305: On-tube or Engraved Detachable Metal Plate
1306 & 1307: Engraved Detachable Metal Plate

Scale Length

1305: 75mm
1306: 127mm / 150mm
1307: 250mm

Scale Graduations

Choice of direct reading units, millimeter or percentage of maximum flow with factor tag.

Protective Tube Sleeve

UV stabilized polycarbonate

O-Ring Materials

Viton® fluorelastomer
Kalrez® 4079

End Block Options

Brass or 316 Stainless Steel


Aluminum or Stainless Steel side plates (Stainless Steel side plates are standard Full-View Replacement meters)

Float Material

316 Stainless Steel

Window Material

Polycarbonate with UV Inhibitor

Process Connections

Brass Construction: Models 1306 / 1307: Female NPT, BSPT / Rc
316 Stainless Steel: Models 1306 / 1307: Female NPT, BSPT / Rc / 150# Flange per ASME B16.5
Brass Construction: Model 1305: Female NPT
316 Stainless Steel Construction: Model 1305: Female NPT

Optional Equipment


Max Pressure

Refer to Maximum Pressure Ratings Table in Data Sheet

Max Temperature

121°C (250°F)

Ambient Temperature Range

33 to 125°F / 1 to 52°C


International Calibration Certificate (ICC)



Diagnostics & Display

Fluid Temperature Range

33 to 250°F / 1 to 121°C

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