Ultrasonic sensors are predestined for monitoring the fill level of liquids, granules and bulk material.
During winding and unwinding operations, distance-measuring ultrasonic sensors precisely measure the outer diameter of rolls with materials such as plastic foil, sheet metal, paper and cardboard, veneer, etc.
The distance to objects can be measured reliably regardless of reflectance, transparency or color of the surface with ultrasonic sensors.
Ultrasonic sensors are based on the measured propagation time of the ultrasonic signal. They emit high-frequency sound waves which are reflected on an object. The objects to be detected can be solid, liquid, granular or in powder form. Ultrasonic sensors reliably identify transparent and other objects which are difficult to detect and where optical sensors might fail. Based on the pulse echo technique, the measured distance value is output as a voltage value. The output current or the output voltage is proportional to the distance of the object to be detected. The steepness of the output curve can be modified, depending on the sensor, via a potentiometer, teach-in or qTeach and optimally adapted to the respective application. It is advisable to use a distance-measuring ultrasonic sensor with current output for applications with long supply lines or massive interference.