Ultrasonic Level transmitters are widely used to measure and control level of Solids and Liquids or distance of any objects.The sensor generates ultrasonic sound waves.From the time taken for the sound waves to strike the target and return the Electronics computes the distance of the object and displays it in terms of distance or level-In millimeter,In litres or a current signal of 4 to 20mA proportional to the level.The transmitter output may be connected to a PLC,Controller etc for Indication or/ and Control of level.Special electronics filter enables detection of largest target,automatically eliminating false echoes and rejecting noise clutter efficiently.