CONTOIL® fuel oil meters work on the volumetric principle of rotary piston meters (positive displacement meters). The main benefits 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. 

 

The ring piston rotates within the flow meter chamber. Due to the excentric movement of the piston, the space within the ring and outer space between the wall of the flow meter is filled through the inlet opening E. After the filling sequence, the fuel is emptied through the outlet opening A.

The 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 and is recorded by means of either a mechanical roller counter or digital display. One rotation of the flow meter corresponds to a defined flow rate.

In the case of DFM 8D, two flow meters are combined into one unit. By means of the first flow meter, the fuel is metered, i.e., the fuel that is delivered from the tank to the motor. By means of the second flow meter, the fuel return is metered; fuel return is excess fuel which is not required by the motor and thus flows back into the tank.

 

For further information regarding specific operating functions and installation considerations please refer to the technical product brochures here.