The Echotel 355 two-wire, loop-powered, non-contact ultrasonic transmitter from Magnetrol International is said to reliably measure liquid-level, volume and open-channel flow. This new low-cost, integral-mount unit features a 60kHz ultrasonic transducer and advanced digital signal processing to measure out to a 6m maximum range.The Echotel 355 can be configured locally with the menu-driven four-pushbutton LCD display or remotely with Hart digital communications or Pactware, with the extra capability of capturing echo waveforms and viewing trend data, diagnostic conditions and all transmitter configuration parameters. The integral-mount electronics are in either a cast-aluminium housing or a Lexan thermoplastic housing. The electronics analyse the ultrasonic echo profile, apply temperature compensation, reject echoes from false targets and then process the true echo from the liquid surface.
This results in reliable measurement, even when application difficulties such as turbulence and false echoes exist. Volume applications are configured by selecting the tank shape and inputting one to three tank dimensions. Open-channel flow configurations are accomplished by selecting one of the 35 flume and weir curves stored in the transmitter and setting multipliers for the resettable and non-resettable seven-digit flow totalisers.
