SENSOR COMMISSIONING CONSIDERATIONS

Sensor commissioning involves selection of the right sensor to job, installation and evaluation. Many sensors feature a "teach" function. The teach function allows the operator to "teach" the sensor the pass or fail condition by placing a known "good" part in the sensor's field-of-view, pressing a key on the sensor, then placing a "bad" part in the sensor's field-of-view and again pressing a key. The sensor evaluates the two conditions and sets a threshold into its memory. Although this technique works in applications where the difference between a "good" part and a "bad" part is great, it is less useful in many other applications where the difference is more subtle.