Volume flow – rotary piston CONTOIL® (Aquametro)

The volume flow meters work on the volumetric principle of rotary piston meters (positive displacement meters).
The main features of this measuring principle are large measuring ranges, high accuracy, suitability for high viscosities and independence from power supply; flow disturbances do not influence proper operation.


Rotary piston, guide roller and drive are the only moving parts in contact with the liquid. Their movement is transmitted by a magnetic coupling through a sealing plate. The hydraulic part is completely separated from the totalising module.


The CONTOIL® oil meters work according to the volumetric measuring principle of the rotary piston meter.

  • Integrated temperature sensor
  • Mass and mass flow calculation
  • Optional linearization
  • volume compensation
  • “Automatic” detection of media change
  • Installation pressure or suction side, without straight inlet and outlet section

Applications: Consumption measurement of heating oil, diesel and heavy fuel oil

Sizes: DN 15 – 50 (flange or threaded connection)

Flow range: 10l / h to 30’000l / h

Accuracy: 0.1% to 1%

Pressure: up to 40 bar

Pt1000 installed

Classic version:

VZO series with mechanical display (roller counter)

Modern version:

VZF II series with electronic counter, flow display, analog and digital output signals and limit switches