DSV Float-Type Flowmeter/Switch

Brand: KOBOLD Instruments, Inc.

The proven KOBOLD flow meters and switches model DSV are based on the principle of the well-known float-type flow meters except for the conventional tapering measuring tube.

These patented instruments are provided instead with a cylindrical flow tube with conical slots around the periphery. This eliminates the usual problems of guiding the cylindrical float within a tapering measuring glass.

The novel design including the provision of an appropriately dimensioned annular gap of constant width between the float and the flow tube has enabled the sensitivity to dirt to be considerably reduced.

The float contains a permanent magnet which actuates a bistable reed contact external to the measuring tube, that is, the flowing medium is hermetically separated from the electrical contact.

In addition it is embedded in a height adjustable switch housing thus ensuring that the contact is protected even in an aggressive atmosphere. As the medium enters the instrument the float rises. Once its magnetic field reaches the contact tips of the reed switch the contact connects.

As the flow increases the float rises further until it reaches its stop. This prevents the float from going beyond the contact range of the magnetic operating tube, that is, the contact remains connected thus ensuring bistable switching. The top edge of the float serves to indicate the flow on the measuring glass in l/min.



  • ± 4 % of Full Scale


  • Cooling Circuits
  • Glass-Melting Tanks
  • Induction Furnaces
  • Infusion Pumps
  • Machine Tools
  • Prevention of Low Water Levels
  • Welding Machines

Approvals & Certifications

  • ATEX
  • cCSAus

BSP Connection

  • G 1" Female
  • G 1/2" Female
  • G 1/4" Female
  • G 1-1/4" Female
  • G 3/4" Female

Connection Material

  • 304 Stainless Steel
  • Nickel-Plated Brass, ms 58

Electrical Connectors

  • Changeover Contact
  • DIN EN 175301-803

Electrical Contacts

  • Normally Open

Electrical Rating

  • Maximum

Enclosure, Body Material

  • Aluminum Anodized (Not Media-Contacted)

Environmental Protection

  • IP65

Flow Rate

  • 0.07 to 34 gpm (0.25 to 130 LPM) - Water

Materials of Construction

  • 304 Stainless Steel - Nozzle Material
  • 304L Stainless Steel - Float Material
  • Borosilicate Glass (Duran 50) - Measuring Glass
  • Brass, Nickel-Plated - Nozzle & Float Material
  • polypropylene - Float Material
  • PVDF - Float Material

Maximum System Pressure

  • psi: 145 (bar: 10, kPa: 1,000)

Mounting Position

  • Verical, Flow in the Upward Direction

NPT Connection

  • 1" NPT Female
  • 1/2" NPT Female
  • 1/4" NPT Female
  • 1-1/4" NPT Female
  • 3/4" NPT Female

Seat / Seal Material

  • FPM
  • NBR

Temperature Range

  • Maximum

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