Ultrasonic Level Transmitters / Indicators are suitable for measuring the Level if fluid in the tank by non contcat method. The Transmitter works on Sound Waves and the out put from the same ( 4 to 20 mA) is given to a Digital level Indicator. The instrument is suitable for Foam Free and fumes Free material only. The type of Transmitters are 2 wire type and 3/4 wire type. The salient features and specifications are as follow: Simple push-button calibration (Accurate) Output 4-20 mA / 20-4 mA (Isolated on 4 Wire Model's only) Built-in temperature compensation Optional RS232 Or RS485 communications with calibration, diagnostics and data logging software PLC compatible Three or Four Wire Operation Self Cleaning operation of sensor face APPLICATIONS Solids (Models 25 U, 45U & 52U Below) Solids Range Approx. ½ of liquid C = Communication 4 for 485 or 2 for 232, Blank = no Communications XX = Operating Frequency, U = Ultrasonic 400 = AC Power, 300 = DC Power