The UPC-Marathon Flo-Meter™ is a rugged and cost-efficient flow meter for gases and liquids. Its machined aluminum structure ensures reliable performance and long service life. The patented float rod assembly is the meter’s only moving part. Each Flo-Meter is calibrated to VDE/VDI 3513 of reading in Waukee’s ISO/IEC17025:2005 accredited laboratory.

The accuracy of the Flo-Meter™ is built-in through the individual calibration of each meter for the specific gas, pressure, temperature, and rate of flow required. Every Waukee Flo-Meter is calibrated to within +/- 3.50% of actual flow reading.

CALIBRATION (N.I.S.T. Traceability):
On request, a 3pt, 8pt, or 13pt Calibration Curve can be provided with a Flo-Meter™ that is traceable to the National Industry of Standards and Technology.


  • Meets NFPA requirements for visual flow indication
  • Simple installation (panel or bracket mounting)
  • Easy to maintain
  • Calibrated in our ISO/IEC17025:2005 Calibration Lab and traceable to NIST (National Institute of Standards and Technology)
  • High turndown ratio
  • Gas flow capacities up to 40,000 CFH (1,140 m3/hr)
  • Liquid flow capacities up to 25 GPH (94 l/hr)
  • Aluminum body for reliable long service life
  • Available with manual control valve
  • Low pressure drop, less than 2″wc (5 mbar)
  • Can be retrofitted to an electronic flow sensor
  • For applications requiring electronic measurement of flow rate, upgrade to our Valve-Tronic Plus™ control valve which includes a flow sensor.


Scale:             Air (70 °F; 14.7 PSIA / 21 °C; 1 bar)

Model S:         4-100 CFH (0-3 m3/hr)

Model M:       10-1,500 CFH (0-42 m3/hr)

Model L:         150-40,000 CFH (4-1,140m3/hr)


Model SF:       0.2-25 GPH (0.75-95 l/hr)

Turndown ratio:                   

Model S:         10:1

Model M:       12.5:1

Model L:         15:1


Turndown Ratio:                   VDE/VDI 3513 sh.2, qG=50%

Model S/SF:    5%

Model M:       4%

Model L:         3%

Max operating temperature: Media: 200 °F (93 °C)

Max pressure: 100 PSIG (7 bar)

Pressure drop: ≤ 2″ W.C. (5 mbar)

Recommended inlet pressure:                     ≥ 0.5 PSI; 14″ W.C. (35 mbar)


  • Annealing
  • Sintering
  • Neutral hardening
  • Carburizing
  • Additive gas or air for endothermic generators
  • Nitriding and much more

Brochure Flo-Meter