The Optical Flow Meter FM-PS2130 is compact, versatile, easy to install and small in installation size. No need to compensate for gaps, sensors with high precision measurement, high repeatability measurement and high positioning accuracy, long stroke and long life. The flow rate of the medium through the Micro Infrared Flow Switching is large or small, so the number of signals generated is nonlinear. Whether it is a volumetric or a velocity flow meter, as long as the amount and speed of the flowing medium change, nonlinearity exists objectively. The electronic part of the photoelectric flow meter compensates the curve of different conditions of the medium, and the measurement algorithm changes with the change of flow rate and flow rate.