OVZ - Economical Oval-Gear Flow Meter for Oils

Brand: KOBOLD Instruments, Inc

KOBOLD OVZ economical oval gear, or oval wheel, flow meters offer users the advantages of positive-displacement technology at a rotameter price. Suitable for viscous media ranging from hydraulic oils to light gear oils, the OVZ eliminates problems associated with viscosity changes during operation.

The flow meter’s cost-conscious design allows for easy maintenance. Since the only wear components are the gears and their axles, the two-step rebuild process can be performed in a few minutes with no recalibration required.

The OVZ is available with either Hall-effect or inductive sensors, giving the user a selection of output signals.

Available NPN, PNP or NAMUR configurations are ideal for connecting to a wide variety of controller devices, including KOBOLD’s full line of frequency input devices. 4-20 mA analog outputs and display options are also available.
  • Suitable for Oils from 10 to 800 cSt
  • Maintains Precision with Viscosity Change
  • Five Material Combinations Available
  • Economically Priced
  • Easy to Maintain
  • 4-20 mA Analog Output & Digital Flowrate Indicators Optionally Available


Measuring Range

  • 0.08-2.1 GPM to 0.42-10.6 GPM


  • 1/4” to 3/4” NPT
  • G 1/4 to G 3/4 Threads

Body Material

  • POM
  • Aluminum

Cover Material

  • POM
  • PMMA
  • Aluminum
  • Polysulfone

O-Ring Material

  • NBR
  • FKM
  • EPDM

Maximum Pressure

  • Up to 580 psig


  • ± 2.5 % Full Scale

Media Temperature Range

  • 14° F to 176° F

Media Viscosity Range

  • 10 to 800 cSt

Media Category

  • Liquid

  • Central lubrication systems for paper machines, filling transmission fluid into gearboxes, and hydraulic systems.


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