Operating of the DKG flow monitors and indicators is based on the movement of a springloaded piston within a cylindrical tube. The fluid is forced to pass a calibrated orifice inside this float, by which a balance is created between actual flowthrough and the counterforce of the spring/piston combination.
A permanent magnet within the piston activates a reed switch, which can be adjusted freely and is mounted external to the flow circuit.
The movement of the float is restricted by means of an endstop to prevent it from going beyond the range of the reedswitch, thus ensuring the bistable character of the flow switch.
The top edge of the float serves to indicate the flowrate on the measuring glass scale.

Control of flowcircuits e.g. for central lubrication circuits, transformer oil systems, etc.
DKG flow monitors are flow and not pressure dependent.
Viscosity compensation :
Viscosity compensation is achieved by the combination of the spring and the calibrated orifice inside the piston and guaranties high accuracy over a viscosity range of 1 to 600 cSt (mm³/s)

The switch ranges given below refer to the limits within which the switch point may infinitely be adjusted. The actual flow throughput can, depending on the flow velocity, be much greater.

Hysteresis is the difference in flow between the switch closing and opening again. By means of the careful choice of reed switches with particularly close differential, a typical hysteresis of 1,5 mm can be achieved with the DKG-2 and DKG-1 series.