The Model SM606 series is a self-contained, pulse-echo device that both transmits and receives sonic energy within its programmed sensing range. These sensors use the latest ultrasonic technology with a discriminating microprocessor that allows the sensor to ignore all surrounding sonic interference and detect only the designated object. When an object is within the fixed analog sensing span, the analog output changes proportionally in relation to the analog sensing span limits. For example, if the object is halfway between the analog span limits, the output is 5 V. As shown below, Hyde Park offers both direct and inverse proportional analog output models for continuous sensing applications.