The Impulse Series guided wave radar level transmitter accurately measures total level, distance or volumetric outputs using time domain reflectometry (TDR). It provides continuous level measurement of liquids to ranges up to 50 ft (15 m), with a two-wire, 4-20mA, HART output signal. Useable in Class I, Div. 1 environments, it works in temperatures from -40 °F to 392 °F (-40 °C to 200 °C).