The water level switch sensor FS-IR02 uses the principle of total reflection in a prism. Reflection or penetration is the basis of
the level alarm output. When the sensor is surrounded by air, the angle of incidence is greater than the critical angle and thus
total reflection occurs, totally reflected light will be transmitted to the receiver. Conversely, when the sensor is surrounded by
liquid, due to the refractive index of the liquid and the sensor tip material, almost all light will penetrate the front of the
sensor. Using this principle, the optical liquid level switch design is based on light, the receiver can detect and determine a
light reflected or penetrated state, and determines the circuit output.
the level alarm output. When the sensor is surrounded by air, the angle of incidence is greater than the critical angle and thus
total reflection occurs, totally reflected light will be transmitted to the receiver. Conversely, when the sensor is surrounded by
liquid, due to the refractive index of the liquid and the sensor tip material, almost all light will penetrate the front of the
sensor. Using this principle, the optical liquid level switch design is based on light, the receiver can detect and determine a
light reflected or penetrated state, and determines the circuit output.
