Profile: Swallow Machinery Ltd. specializes in offering ancillary machinery for the paper, film and foil conversion industries. We provide ultrasonic edge detection systems. Our compensated ultrasonic detection is a process in which the detection signal is monitored by a micro-controller that automatically compensates the guide point for changes in process contaminates, temperature, humidity and air turbulence. Detection systems are also available for hazardous locations and temperatures up to 500°F using this technology. Infrared optical detection is used for vacuum applications and porous materials that are less than 10% acoustically opaque.