Capacitive and ultrasonic proximity sensors are often used for level detection. Capacitive models are useful for detecting the level of solids such as plastic pellets, and can even detect from outside a non-metallic tank wall, or from inside a sensor mounting well. General purpose ultrasonic sensors can operate as downward facing, non-contact level sensors.
AutomationDirect offers a variety of capacitive level sensors. NPN and PNP logic outputs and normally open or normally closed output models are available. All capacitive proximity sensors have LED status indicators to verify operation at the switch; and all capacitive proximity sensors are IP65 or IP67 rated.
SU, UK, UT and TU series round body reflective ultrasonic distance sensors emit a sound impulse and measure the elapsed time of the returned echo signal reflected off of a detected object.
Capacitive proximity sensors.
Ultrasonic sensors are ideal for applications in which the sensed object is made of clear, transparent or varying surface color materials. You can standardize on one sensor for many materials, without any extra setup or sensing concerns.