Fluid e.g. water, consumption detecting device for fluid meter, has photodiode to receive light beams that is processed to deduce number of disk turns, where straight line connecting beam traces forms non-zero angle at center of disk

摘要

The device has light emitting diodes and a photodiode aligned parallel to diameter of a rotating disk (4) of an indicator. The optical light beam received by the photodiode is processed to deduce number of disk turns. The disk has a sector reflecting an angle (between 45 and 225 degrees) at center of the disk. A straight line connecting each trace of the beams at the center of the disk forms a non-zero angle at the center. An independent claim is also included for a fluid meter.