The TBT/TBR-600-40 is primarily a Thru-Beam sensor consisting of one transmit and one receive transducer, in separate and self contained housings. It can count up to 200 objects per second, as they pass through its ultrasonic beam, from 0 to 40 inches. The sensors can also be mounted in a Reflective position to detect targets. The Thru-Beam and Reflective mounting options provide the user with simple and accurate ways to detect the presence of various objects. An adjustable Delay control is added to vary the output re-sponse of the solid state relays to the time, or count rate, of a moving target. An adjustable Sensitivity control is added to provide highly accurate target detection. P1 on the receiver (TBR) is labeled sensitivity adjustment. The LED is pro-vided to show signal strength. The sensor is factory set with P1 fully clockwise (cw), making the LED solid red in color.
When P1 is fully counterclockwise (ccw), the LED will be solid green in color. After positioning the sensors at the required distance, a typical adjustment is performed by turning P1 ccw, causing the LED to change from a solid red to a mostly red condition. The unit is now properly adjusted. To achieve greater sensitivity for smaller targets, turn P1 ccw so that the LED will be more green in color. To make the sensors less susceptible to heavy dirt build up, turn P1 cw so that the LED will be brighter red in color.