Kofloc FM01 Vortex Flow Meter for Liquids

KOFLOC’s Karman Vortex Flow Meter FM Series provides an ideal tool for measuring and monitoring liquid flows, in-cluding cooling water and cleaning water.

Kofloc FM01 Vortex Flow Meter for Liquids Karman Vortex Flow Meter FM Series provides an ideal tool for measuring and monitoring liquid flows, including cooling water and cleaning water. Since PPS resin is used for the body material, all models of the series offer superior reliability and durability.

When an object is put in a flow of liquid, an oscillating vortex street, called Karman vortex street, takes place in downstream of the object. It was named after the fluid dynamicist who discovered this phenomenon. Our Karman vortex flow meters have been developed based on the measurement principle of a Karman vortex street.

Small and lightweight.
Wide flow range available from 0.5~4L/MIN to 10~150L/MIN.


Technology: vortex
Fluid: for water
Installation: in-line
Communication: 4-20 mA
Supply voltage: 24VDC, 12VDC
Protection level: IP64
Other characteristics: compact
Volumetric flow rate Max. : 150 l/min (39.6 us gal/min) , Min.: 0.5 l/min (0.1 us gal/min)
Process temperature : Max.: 70 °C (158 °F) , Min.: 0 °C (32 °F)
Process pressure: 1,000,000 Pa (145.04 psi)
Precision : 3 %
Repeatability: 0.5 %


  • Simple design that minimizes a dead space
  • Measurements of very small flows available (up to 0.5 L/min)
  • Use of PPS resin has achieved a small, lightweight and rigid.
  • The sensor can be used for pure water or deionyzed water and chemicals (the sensor is acid-/alkali-resistant).
  • These models are in the process of application for CE Marking.


  • FA instruments
  • Semiconductor manufacturing
  • LCD
  • Housing material production
  • Medicine production
  • Chemical industry
  • Biomedical applications
  • Environment systems
  • Food processing
  • Agricultural/Botanical applications


Model FM0101 FM0102 FM0103 FM0105
Dimension (a) 17.8 17.5 17.5 32.5
Dimension (L) 80.6 80 80 110
Connection (X) R3/8 R1/2 R1/2 25A
Flow range 0.5-4 L/min 2-16 L/min 4-40 L/min 10-150 L/min
Fluids for measurement Cooling water, cleaning water, etc.
Measuring accuracy Within ±3.0% F.S
Repeatability Within ±0.5% F.S
Outputs S Type: 4-20mA
P Type: Pulse (Open collector) (For w/o indicator only)
D Type: With indicator
Supply voltage 12-24VDC
Liquid temperature range 0-70℃
Proof pressure 1MPa
Amb. temperature range 0-50℃
Amb. humidity range 5-90%RH
Applicable cleanliness/
waterproofing standards
IP64 (Splashproof construction per JIS C 0920)
Material for wetted part PPS with 30% glass mixture PPS w/o glass mixture
Cable length W/o indicator: 2 meters long; terminated/pretinned (presoldered)
With indicator: 3 meters long; terminated/pretinned (presoldered)
Weight W/o indicator: 85 g (Sensor unit) 165 g (Sensor unit)
With indicator: 100 g (Sensor unit) 205 g (Sensor unit)


Datasheet: Kofloc FM01 Vortex Flow Meter for Liquids

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