MF Flow Meters Litre Meter Positive Displacement Flowmeters

Positive displacement flowmeters, also known as PD meters, measure volumes of fluid flowing through by counting repeatedly the filling and discharging of known fixed volumes. A typical positive displacement flowmeter comprises a chamber that obstructs the flow. Inside the chamber, a rotating/reciprocating mechanical unit is placed to create fixed-volume discrete parcels from the passing fluid.

In the VFF the rotor is basically a disc shape with an annular groove on its underside capable of holding and transporting flow from the chamber inlet to the outlet. Some fluid is also transported in a cavity formed between the rotor outside wall and the chamber wall. A centre ‘peg’ under the rotor is constrained to run in a circular groove in the body.

A web (or plate) in the body is engaged with a slot in the rotor and this modifies the rotation to that of an oscillation as flow passes. It is this oscillation that produces the compartmentation of the fluid into ‘positively displaced pockets’. The top of the rotor is equipped with a powerful magnet directly above the ‘peg’ that is on the underside and so this also has a circular path which allows it to engage and disengage a reed switch sensor located in the top cap above.


The MF (or Medium Flow) VFF covers flow rates up to 180 l/hr. It was first provided in 1992. The MF30 was originally rated to 3.0 l/min – hence MF30.


Typical Applications

  • Chemical Injection
  • Hydraulics
  • Wax Dispersant
  • Corrosion Inhbitor
  • Subsea Control fluid
  • PIB
  • Scale Inhibitor
  • Subsea flow
  • shalphtene Dispersant

Key Features

  • Compact
  • No straight lengths
  • Single Moving Part
  • Large Viscosity range, from methanol upwards
  • Pressure independent measurement
  • Ultra High Pressure Capability (60,000psi, 4000bar if required)
  • Very Low Flow Measurement
  • Measures pulsing flow accurately
  • Low Maintenance
  • Tolerant of particulate up to 100+ microns
  • Preserves Molecular Integrity of fluid
  • Highly Durable
  • Low pressure drop (<0.1 bar typical)
  • Proven since 1986


Technical Specifications MF range

MF300 - 180 l/hr 
Accuracy±1% of reading, requires linearisation. Provided by all Litre Meter instrumentation. 
Pressure Rating±1% of reading, requires linearisation. Provided by all Litre Meter instrumentation. 
Temperature Rating-40°C - +100°C dependent on material and instrument; higher temperature possible. 
Viscosity Range0.5 - 100,000 cP or greater. 
Recommended FiltrationA 100 micron filter is advisable for 100% long life serviceability. 
DimensionsRefer to K0002 drawings

Download Datasheet: MF Flow Meters Litre Meter Positive Displacement Flowmeters


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