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Echotel® Model 300/301 Ultrasonic Non-Contact Transmitter The Model 300/301 is a full-featured, powerful ultrasonic system for measurement of liquid level, volume, or open-channel flow. Literature Instruction Manual   (546 KB) Sales Literature   (222 KB) More... 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: Isolated 4-20 mA output includes an active/passive mode for loop power or device power Output in units of level, volume, or open-channel flow 16-button keypad and two-line, 16-character LCD alphanumeric display Temperature compensation integral to ultrasonic transducer Explosion proof approvals on transducer and transmitter Applications: Water and wastewater Slurries Viscous fluids Oils Acids Caustics Options: 1" or 2" NPT process connection Integral or remote mount electronics RS-485 with Modbus protocol Two or four 10 amp SPDT gold flash relays Last Update: 8/24/2005