Check the sensor's wiring when using buzzer, lights in the applications, they may produce high voltage, large current. So please do not use this kind of detection method.
A sensor's sensing distance and standard distance itolerance are typically ±10%.
A photoelectric sensor emits a beam of light (visible or infrared) from its transmitter. A reflective type photoelectric sensor is used to detect the light beam reflected from the target and the thrubeam type is used to measure the change in light quantity caused by the target crossing the beam.
The effective sensing distance of an inductive sensor varies with the size, shape and material of the target object. Sensing distance will increase with a larger target object until it reaches at certain size then it seizes to increase and becomes a constant. Typically the defined sensing distance reaches by the smallest target object is the the standard target object. Standard target object material is Iron (St37) square with a thickness of 1mm and a side length equal to the diameter of the sensing face and 3X sensing distance which ever is larger.
From the specifications sheet one must verify the key spec as shape and dimensions, sensing distance, operating voltage and output configuration (NPN/PNP), output states （NO/NC). In addition, the wiring types (Cable wiring/Connector), cable length, switching frequency, temperature requirement, water ingress protection (IP Level). In some special sensing applications, a special sensor will be needed. Take Meijidenki sensor as an example, options available include high pressure, high temperature, high switching frequency, high magnetic field immune, analog outpout, namur and Factor 1 sensors.
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