Kobold Turbine Wheel Flowmeter, DOT
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DOT Turbine Wheel Flowmeter/Monitor

Brand: KOBOLD Instruments, Inc
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The KOBOLD turbine flow meter Model DOT consists of a helically shaped turbine rotor supported in two tungsten carbide bearings, the rotor being solid ferritic stainless steel of a grade compatible with the metered liquid, all contained within a housing of non-magnetic stainless steel. 

A pick off coil having a permanent magnet core is mounted in the housing adjacent to the rotor blade tips such that a magnetic circuit is set up via the rotor blades.

Rotation of the rotor varies the reluctance of this magnetic circuit and the flux changes induce a small voltage in the coil, the frequency of which is directly proportional to the rotor speed and therefore proportional to the volumetric flow rate. 

The effects of increasing viscosity reduce the linear flow range and shifts the k-factor. Further, the effect of viscosity depends on the frequency (RPM of rotors). Therefore, smaller the meter, higher is the effect of viscosity on the linearity curve.

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Specifications

Brand

Ambient Temperature Range

  • Maximum

Applications

  • Chemical & Allied Products
  • Deionized Water Flow
  • Fuel Additives
  • Hydraulic Applications
  • Other Low Viscous Fluids
  • Petrochemical Plants
  • Pharmaceuticals
  • Plastic Machinery
  • Water Treatment

Approvals & Certifications

  • ASME B16.5

Bearing Material

  • 316 Stainless Steel - Bearing Support
  • 316L Stainless Steel - Bearing Support
  • Tungsten Carbide (Shaft, Bush, Thrust Plate)

BSP Connection

  • G 1” Male
  • G 1/2” Male
  • G 1-1/2” Male
  • G 2” Male
  • G 3/4” Male

Bushing Material

  • Tungsten Carbide

Cable Entry

  • M20 x 1.5

Enclosure, Body Material

  • 316 Stainless Steel

Environmental Protection

  • IP54
  • IP66
  • IP67

Filter

  • 300 microns (0.3 mm or 60 Mesh) - Sizes up to DN 50
  • 500 microns (0.5 mm or 100 Mesh) - Sizes from DN 80

Flange Material

  • 316 Stainless Steel
  • 316L Stainless Steel
  • Carbon Steel A106

Flange Size - 1-1/2” (DN 40)

  • 1-1/2” (DN 40) - PN 16

Flange Size - 1” (DN 25)

  • 1” (DN 25) - PN 16

Flange Size - 1/2” (DN 15)

  • 1/2” (DN 15) - PN 16

Flange Size - 2” (DN 50)

  • 2” (DN 50) - PN 16

Flange Size - 3” (DN 80)

  • 3” (DN 80) - PN 16

Flange Size - 3/4” (DN 20)

  • 3/4” (DN 20) - PN 16

Flange Size - 4” (DN 100)

  • 4” (DN 100) - PN 16

Flange Size - 6” (DN 150)

  • 6” (DN 150) - PN 16

Flow Capacity

  • 0.064 to 323.71 scfm (0.11 to 550 m³/hour)
  • 0.064 to 40.02 scfm (0.11 to 68 m³/hour)

Input Power

  • 12-24 Vdc - Power Supply
  • 8-24 Vdc - Power Supply

Linearization

  • ± 0.5 % of Reading

Materials of Construction

  • 316 Stainless Steel (up to DOT-xx15) - Rotor Material
  • Stainless Steel ANC 21 - Rotor Material

Maximum System Pressure

  • psi: 3,626 (kPa: 25,000, bar: 250)

NPT Connection

  • 1” NPT Male
  • 1/2” NPT Male
  • 1-1/2” NPT Male
  • 2” NPT Male
  • 3/4” NPT Male

Output

  • 2-Wire Reluctance Typical Pick-Off Coil
  • 40 mA Peak-to-Peak at Min. Flow Rate
  • 4-20 mA

Repeatability

  • ± 0.02 to ± 0.05 % Under Steady Flow Conditions

Shaft Material

  • Tungsten Carbide

Switch Type

  • SPDT x 2 Relays

Temperature Range

  • -20° to 120° C (-4° to 248° F)

Documentation

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