KOBOLD KFF/KFG Rotating Vane Low Volume Flow meter

KOBOLD KFF/KFG Rotating Vane-Low Volume are used for measuring low and smaller, volumetric flow rates of gases (KFG) and liquids (KFF). The media must be transmissive for infrared light.

Series KFF/KFG 1000 flowmeters are available in Ryton®, brass and PTFE materials; therefore suitable for many applications in industry, in laboratories, and so forth. The new PTFE sensor of the 1000 series is delivered as standard with (0 … 5 VDC) analogue output and frequency output. The frequency output is optional on other models. Series KFF/KFG 3000 flowmeters are available in Ryton® and in brass.

Kobold Rotating Vane-Low Volume
Rotating Vane-Low Volume KFF-1, KFG-1

Measuring Range:

  • 15 – 100 ml/min … 1 – 10 l/min water
  • 25 – 100 ml/min … 100 – 500 l/min air

Connection: G ⅛  … G ½
Material: brass, Ryton®, PTFE
pmax: 35 bar
tmax: 50°C
Accuracy: ±3 % of full scale
Viscosity range: low viscosity
Pulse output, 0 – 5 VDC

Kobold Rotating Vane-Low Volume
Rotating Vane-Low Volume KFF-3, KFG-3

Measuring range:

  • 15 – 100 ml/min … 1 – 10 l/min water
  • 25 – 100 ml/min … 100 – 500 l/min air

Connection: G ⅛ … G ½
Material: PPS, brass, PTFE
pmax: 35 bar
tmax: 50°C
Accuracy: ±3 % of full scale
Viscosity range: low viscosity Digital display, 0 – 5 VDC

KOBOLD KFF/KFG Function Principle

The flowmeter is based on the Pelton Principle, that is, the flowing medium causes a vane to rotate. The rotary motion is converted to electrical impulses by means of photodiodes. The flow rate is output as a frequency signal or a linear analogue (0…5 VDC).

KOBOLD KFF/KFG Specifications

Technical Data

  • Accuracy: ± 3 % f. s.
  • Linearity: ± 3 % f. s.
  • Repeatability:
    • KFF: ± 0.2 % f. s.
    • KFG: ± 1% f. s.
  • Installation position: horizontal
  • Temperature range: 0…50°C
  • Temperature drift: 0.2%/ °C
  • Max. pressure:
    • KFF:
    • Ryton®: 7 bar
    • Brass: 35 bar
    • PTFE: 4 bar
    • KFG: 2.5 bar
  • Supply voltage: 12.5 VDC ± 2 VDC
    PTFE version: 12.5 VDC ± 1 VDC
  • Current consumption: 50 mA (typically)
  • Output:
    • KFF-1../KFG-1..:
    • Standard: 0…5 VDC
      Option T
    • (KFF-1.. only): 0…5 VDC and frequency output
    • PTFE version: 0…5 VDC and frequency output
  • Max. frequency: 500 Hz
  • KFF-3../KFG-3..: 0…5 VDC

Material

Version Ryton® Brass PTFE
Housing 60% Ryton®/ 40% glass Brass/grass PTFE
Turbine 60% Ryton®/ 40% glass 60% Ryton®/ 40% glass PTFE
Bearings Sapphire Sapphire Sapphire
Bearing Shell St. steel (316) St.steel (316) PTFE
Gasket FPM FPM Kalrez®
Connection Acetal Brass PFA

Download Datasheet: Kobold Rotating Vane-Low Volume

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