Search This Site

(Search by Product Type i.e. Level or Brand Name i.e. Walchem)

F-451 Polysulfone Flow Meter

USA Toll Free: 1-800-730-0302 Tel: 416-240-1920 -

F-451 Polysulfone Flow Meter

Pipe sizes 1" female NPT (Polysulfone) 1-1/2"  female NPT (PVC)

Flow from Liquid: 0.5 to 40 GPM (2 to 155 LPM) Air: 4 to 80 SCFM (7 to 140 M³/hr)

Panel Mount, Sheild, and Brass Adapters Available


  • Polysulfone meter body resists high temperatures and pressures.

  • 316 SS, PTFE or Hastelloy rod guided float.

  • Direct reading permanent scale.

  • Not recommended for direct sunlight.

  • Available OEM options: Private labeling, custom calibrations and custom materials.

  • In-Line (vertical) mount only.

  • Polycarbonate shield available.

Adapter Options:

  • 1” and 1-1/2” Inline units.

  • 1” M/NPT panel mount units.

  • 1” F/NPT and 1” sweat brass units.


Max. Working Pressure: 150 psig (10.3 bar) @ 70° F (21° C)

Max. Fluid Temperature:

Standard Models, 1” pipe: 212° F (100° C) @ 0 PSI

Standard Models, 1½” pipe: 130° F (54° C) @ 0 PSI

SolarMeter®: 240° F (115° C) @ 0 PSI

Full Scale Accuracy: +/- 3%

Meter Body Material: Polysulfone

Adapter Material:

Standard Models, 1” pipe: Polysulfone

Standard Models, 1½” pipe: PVC

SolarMeter®: Brass

Union Nuts: Glass fiber reinforced Nylon

Guide Rod Material: 316 SS or Hastelloy C-276

O-ring Material: FKM (Optional EP)

Max Pressure Drop: 2 PSI

Approx. Shipping Weight: 3 lb. (1.36 kg)


Liquid (water)

  • 0.5-6 GPM / 2-22 LPM
  • 1-10 GPM / 4-40 LPM
  • 2-20 GPM / 6-76 LPM
  • 3-30 GPM / 10-115 LPM
  • 4-40 GPM / 15-155 LPM

Gas (air)

  • 4-40 SCFM / 7-70 M3/HR
  • 8-80 SCFM / 15-140 M3/HR

Model Numbers

1” F/NPT Polysulfone Adapters

Tech. Data Sheet (PDF) (PN 85000-036

1” Brass Adapters

Tech. Data Sheet (PDF) (PN 85000-036)

1-1/2” F/NPT PVC Adapters

Tech. Data Sheet (PDF) (PN 85000-036)

In-Line Standard Units – AIR

Tech. Data Sheet (PDF) (PN 85000-036)

Instruction Manual (PDF) (PN 80000-247)
Exploded View Diagram (PDF)


About Us

Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


Our Products

Dataloggers, sensors, pumps, recorders, hand held instruments, flow instrumentation, level controls, valves, instrumentation, containers, tanks, transmitters, data loggers, digital indicators, mixers and agitators, pressure intrumentation, analyzers and controllers for a variety of industrial applications such as water quality, pH/ORP and more.

Website Content

Water Analyzers and Controllers, Wireless Products, Corrosion Monitoring Equipment, Cooling Tower and Boiler Controllers, a wide variety of Pumps, Valves, Dataloggers and Recorders, HVAC, Instrumentation, Skids and Systems, Containers and Tanks from world leading manufacturers are products you will find on this site.

Get in Touch