PREDATOR XS TURNTABLE STRETCH WRAPPER OPERATION MANUAL
HIGHLIGHT INDUSTRIES, INC. ● 2694 PRAIRIE SW; WYOMING; MI 49519 ● 1-800-531-2465
II-19
Optiona
Optiona
Optiona
Optional Height Detection
l Height Detection
l Height Detection
l Height Detection Sensor
Sensor
Sensor
Sensor
The optional ultrasonic sensor may be purchased to replace the standard height detection
photoelectric sensor.
Ultrasonic Sensing Concept
Ultrasonic sensors emit and receive sound at frequencies above the range of human hearing
(ultrasound; about 20 kHz). They sense objects by measuring the time it takes to reflect the
ultrasound waves from the object’s surface and back to the receiver transducer, or by detecting an
object’s presence when it interrupts the transmission of sound from the emitter to an opposed
receiver. Unlike infrared photoelectric sensing, which is based on an object’s opacity or reflectivity
to light, ultrasonic sensing depends on object’s density—it’s ability to reflect or block sound. This
makes ultrasonic sensing practical for detection of clear materials and other objects that are
difficult to detect with photoelectric sensors.
