Ultrasonic sensors enable contact-free distance measurement and object detection. High repeat accuracy and resolution are the features of this measurement technique. An ultrasonic transducer transmits and receives the acoustic pulse reflected by the measurement object. These are converted into analogue and/or digital signals. The sensors are protected from voltage peaks, polarity reversal and short circuit.
|Extremely accurate measurement|
|FIELDS OF APPLICATION|
|Bulk commodity industry|
The measured values (switching points, switching functions, analogue measuring range, background suppression, hysteresis, characteristic curves and response times) can be optionally: factory set, externally set using switches or potentiometers (teach-in) or programmed using software via RS232 or RS485 interface respectively. 0…10 Volt or 4…20 mA are provided as analogue outputs. You can choose between digital switching functions NPN, PNP, NO and NC.
The primary advantage of ultrasonic sensors is safe measuring without touching the media. For instance, contact-free measuring of the sensors allows you to use them for level measurement of aggressive media. As opposed to this, the optical or mechanical level sensors that touch the media can only be used for selected fluids since their casing can be damaged or destroyed. The measurement principle of ultrasonic sensors is principally based on the change of time period of the sound waves.
The evaluation electronics integrated or externally used in the sensor can be individually set to a minimum and a maximum distance. Object detection also functions on the basis of the measurement principle of time for the ultrasonic sensors. Ultrasonic sensors make it possible to detect the appearance of an obstacle or the disappearance of an object.