The Type 81776 is a non-contact ultrasoniclevel transmitter, designed for continuous levelmeasurement in open or closed vessels. Theunit is suitable for liquids, but also for solids, invirtually all industries, particularly in water and waste water management.

The transducer of the ultrasonic sensor emits short ultrasonic pulses, at 55 kHz to the measured product. These pulses are reflected by the product surfaceand received by the transducer as echoes. The running time of the ultrasonic pulses from emission to reception is proportional to the distance and hence

to the level. An integrated temperature sensor detects the temperature in the vessel and compensates the influence of temperature on the signal running  time. The determined level is converted into an output signal and transmitted as an measured value.