Kobold Variable Area Flowmeter/Switch (30-100 L/hr), V31
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V31 Variable Area Flowmeter/Switch (30-100 L/hr)

Brand: KOBOLD Instruments, Inc
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Kobold Variable Area Flowmeter/Switch (30-100 L/hr), V31
The measuring element is composed of a float and a conical glass tube. A medium flows from the bottom to the top through the measuring ring, lifting the float until the buoyancy force and the weight of the float establish equilibrium. 

The height of the float in the measuring ring is the measure of the flow. The flow rate is read directly from a scale inscribed on the glass. 

The readings obtained apply solely to the medium for which the device has been calibrated or for a medium with the same density and viscosity.

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Specifications

Brand

Accuracy

  • 1.6 % - Liquids
  • 2.5 % - Gases
  • qG = 50 %

Ambient Temperature Range

  • -20° to 80° C (-4° to 176° F)

Applications

  • Dosing
  • Flow Metering
  • Gas Service
  • Liquid Service
  • Monitoring

Approvals & Certifications

  • ATEX 2 GD IIC TX (BVS 10-ATEX-H/B 119)
  • EN 1092

Approvals & Certifications

  • Inspection Report
  • Works Certificate

BSP Connection

  • G 1/2” Female
  • G 1/4” Female
  • G 3/8” Female

Connection Material

  • 316Ti Stainless Steel
  • PVC
  • PVDF

Connection Style

  • Glue

Dimensions

  • L/hr = 3,000 L/hr to Water
  • m³/hour > = 50,000 NL/hr to Air

Electrical Contacts

  • Inductive Contact
  • Normally Closed & Normally Open
  • Reed Contact

Electrical Rating

  • 250 Vac / 0.5 A / 10 VA
  • 250 Vac/dc / 1.5 A / 150 VA / 100 W
  • 250 Vdc / 0.5 A / 5 W
  • 5-25 Vdc

Enclosure / Body Material

  • 304 Stainless Steel

Environmental Protection

  • Weatherproof

Flange Size - 1” (DN 25)

  • 1” (DN 25) - ASME B16.5 Class 150
  • 1” (DN 25) - PN 10
  • 1” (DN 25) - PN 16
  • 1” (DN 25) - PN 25
  • 1” (DN 25) - PN 40

Flange Size - 1/2” (DN 15)

  • 1/2” (DN 15) - ASME B16.5 Class 150
  • 1/2” (DN 15) - PN 10
  • 1/2” (DN 15) - PN 16
  • 1/2” (DN 15) - PN 25
  • 1/2” (DN 15) - PN 40

Flange Size - 3/4” (DN 20)

  • 3/4” (DN 20) - ASME B16.5 Class 150
  • 3/4” (DN 20) - PN 10
  • 3/4” (DN 20) - PN 16
  • 3/4” (DN 20) - PN 25
  • 3/4” (DN 20) - PN 40

Flange Size - 3/8” (DN 10)

  • 3/8” (DN 10) - PN 10
  • 3/8” (DN 10) - PN 16
  • 3/8” (DN 10) - PN 25
  • 3/8” (DN 10) - PN 40

Flow Rate

  • 3-30 to 10-100 L/hr to Water - Stainless Steel Float
  • 50-500 to 160-1,600 Nl/Hour to Air - Aluminum Float

Gasket Material

  • EPDM
  • FEP
  • FFKM
  • FKM
  • Perfluor
  • Viton

Length

  • 14.7” to 19.6” (375 to 500 mm)
  • 15.7” (400 mm)
  • 16.7” (425 mm)
  • 19.6” (500 mm)

Materials of Construction

  • 316 Stainless Steel - Float Stop
  • 316Ti Stainless Steel - Float, Float Guiding
  • Aluminum - Float
  • Borosilicate Glass - Measuring Tube
  • Polycarbonate - Shatter Protection
  • PVDF - Float, Float Stop

Media

  • Liquids & Gases

NPT Connection

  • 1/2” NPT Female
  • 1/4” NPT Female
  • 3/8” NPT Female

Pressure Range

  • psi: 36.26 to 217.6 (kPa: 250 to 1,500, bar: 2.5 to 15)

Process Temperature

  • -10° to 100° C (14° to 212° F) - Float Material PVDF
  • -10° to 150° C (14° to 302° F) - Float Material Stainless Steel / Aluminum
  • -10° to 50° C (14° to 122° F) - PVC Glue Connection

Seat / Seal Material

  • EPDM
  • FEP
  • FFKM
  • Viton

Size

  • Diameter: 1/2” (12 mm) - Inner Diameter Ø 13
  • Diameter: 3/8” (9.5 mm) - Inner Diameter Ø 19

Storage Temperature

  • -10° to 60° C (14° to 140° F)

Switch Type

  • SPDT

Turndown

  • 1:10

Union Nut Material

  • Aluminum
  • Stainless Steel

Wetted Materials

  • PVDF
  • Stainless Steel

Documentation

Data Sheets

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