These powerful and effective instruments emit an acoustic wave pulse, which is then reflected from the surface of the material being measured. The reflected signal is processed using specially developed software to enhance the correct signal and reject false or spurious echoes. The measured signal is temperature compensated to provide maximum accuracy to the outputs and display. This principle of operation elevated the instrument range to one of the most powerful level measurement systems on the market. This is a high-power device with long-range capability even on 2-wire loop power. There is no direct contact with the media, which can extend up to 393 feet (80 meters) from the sensor. Available in 2, 3, or 4-looped.