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Echotel® Model 344/345 Ultrasonic Non-Contact Transmitters Models 344 and 345 are full-featured, ultrasonic non-contact transmitters that provide continuous measurement for liquid level, volume, or open-channel flow applications. Their measurements are not affected by changes in specific gravity, viscosity, or conductivity. Literature Select Your LanguageUS English Additional Tools:            Measurement Principle: Ultrasonic pulses are emitted from the transducer and the time required for the echo to reflect from the liquid surface and return to the transducer is measured. Features: Front panel keypad for ease of programming 4-20 mA isolated and RS-232 outputs Four 10 amp SPDT relays Password protected access 13-character alphanumeric display of all parameters Complete self-diagnostics Applications: Water and wastewater Slurries Viscous fluids Fuel oils Acids Caustics Options: Mechanical totalizer Data logger Floor or wall-mount bracket Heater and thermostat