The SLM600 PLUS Series is a highly accurate ultrasonic level measurement system, which provides non-contact level measurement for a wide variety of applications. Easy “set it and forget it” installation and simple calibration makes it highly user-friendly. Two switched NPN open collector outputs, with fully programmable set-points are provided in the 3-wire type, together with fault condition being indicated by the analog output on both the 2 and 3-wire types. The Sondar SLM600 PLUS Series operates on the principle of timing the echo received from a measured pulse of sound transmitted through the air and utilizes “state-of-the-art” echo extraction technology.