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Echotel® Model 335 For Level, Volume, or Open-Channel Flow The Model 335 is a high performance, non-contact transmitter with extremely powerful and flexible software resulting in virtually unsurpassed measurement performance. Literature Instruction Manual   (466 KB) Sales Literature   (211 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: Advanced digital signal processing 50 kHz transducer with 26 foot range Narrow, 7 degree beam angle Level, volume or open-channel flow measurement 4-20 mA output and SPDT relay Extensive support of flumes and weirs Applications: Sumps, wells, and open channels Chemical storage tanks Vessels with highly viscous media Batch and day tanks Options: 85 to 255 VAC, 10.5 to 40 VDC, or 10.5 to 28 VAC 2" NPT or 2" BSP process connection Last Update: 8/24/2005