Kobold V31 Variable Area Flow Meter/Switch

Overview

Kobold V31 Variable Area Flow Meter/Switch, 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.

Kobold V31 Applications

The Kobold V31 metering device is used for flow metering, dosing, monitoring, and control of liquid and gas media in pipes. The scale on the device shows the flow rate expressed as volume or mass per unit of time. Applications: flow metering, dosing, monitoring, and control of liquid and gas media.

• The device can be fitted with up to two limit switches for purposes of process monitoring.
• The K ( & metering device is used for flow metering, dosing, monitoring, and control of liquid and gas media in pipes.
• The scale on the device shows the flow rate expressed as volume or mass per unit of time.
• Applications: flow metering, dosing, monitoring, and control of liquid and gas media.
• The device can be fitted with up to two limit switches for purposes of process monitoring.

Specification

• Measuring / switching range:
  • 3 – 30 … 1000 – 10 000 l/h water
  • 36 – 360 Nl/h … 18 – 180 Nm³/h air
• Connection: G ¼ … G 2 female thread, hose connector, glue-in connection, flange DN10 … DN65, ANSI ½ … 2½”
• Material: glass inside protection tube pmax: 15 bar
• Temperature range: 0 … 80°C
• Accuracy class: 1.6 / 2.5
• Option: contact

Technical Data

• Measuring range
  • Turndown ratio 1:10
  • Smallest measuring  range
    • Water 3 – 30 l/h
    • Air 36 – 360 Nl/h
  • Largest measuring range
    • Water 1000 – 10000 l/h
    • Air 18000 – 180000 Nl/h
  • Dimensions for measrured variable
    • water
      • l/h <= 2500l/h
      • m³/h >= 3000 l/h
    • air
      • l/h <= 40000 Nl/h
      • m³/h >= 50000 Nl/h
    • Dimensions for measrured variable
  • Dimensions for measrured variable
    • Liquids 1,6%
    • Gases 2,5%
    • qG 50%
• Flow direction :  from bottom to top
• Materials
  • Measuring tube Borosilicat glass
  • Connections 1.4571, PVDF, PVC
  • Float 1.4571, aluminium, PVDF
  • Float guiding 1.4571
  • Seals Viton, EPDM, FEP/FFKM
  • Float Stop PVDF / stainless steel
  • Protection body 1.4301
  • Shatter protection Polycarbonat
• Ambient conditions
  • Ambient temperature -20…+80 °C (-4…+176°F)
  • Ambient temperature PVC -20…+80 °C (-3…+176°F)
  • Storage temperature -20…+60 °C (-4…+140°F)
• Climatic category  : Weatherproof and/or unheated operation site, class C according to DIN IEC 654 part 1
• Shock resistance / vibration resistance :  The device should be protected against extreme shock and vibration, either of which could cause damage
• Medium Conditions
  • Pressure Resistance
    • Ranges B1 bis C7 max. 15 bar (at max. 80°C ; 176° F)
    • Ranges D1 bis D8 max. 10 bar (at max. 80°C ; 212° F)
    • Ranges E1 bis E5 max. 6 bar (at max. 80°C ; 176° F)
    • Connections in PVDF
      • max. 10 bar (at max. 20°C ; 68° F)
      • max. 4 bar (at max. 40°C ; 104° F)
      • max. 2,5 bar (at max. 50°C ; 122° F)
    • Connections in PVC
    • max. 10 bar (at max. 20°C ; 68° F)
    • max. 4 bar (at max. 40°C ; 104° F)
    • max. 2,5 bar (at max. 50°C ; 122° F)
• Media Temperature
  • Float material
  • st.st. / Aluminium -10° – +150°C (+14° – +176° F)
  • Float material PVDF -10° – +100°C (+14° – +176° F)
  • PVC Glue connection -10° – +50°C (+14° – +122° F)
• Status liquid or gaseous
• Density
  • Liquids <=2,0 kg/l
  • Gases – / –
• Inlet and outlet straight
  • Inlet and outlet straight are not required as long as the flow profile is laminar. On strongly non laminar flow profiles e.g. regulating and shuttoff devices inlet straight of 250 mm, see also directive VDI/VDE 3513

Download Datasheet: Kobold Variable Area Flowmeter / Switch V31

Reference: kobold.com

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