The ProLine PL-2001 Dynamic Timer allows companies to monitor back up on production lines.  Set the value for the timer.  Once the photo-sensor is blocked for that time, the output contacts will close allowing you to light a lamp, sound a buzzer, or signal other equipment. 
 
Choose from Hours/Minutes or Minutes/Seconds. Other sensor inputs are available as well as cable extensions.
 
Features include; heavy-duty ABS enclosure, flanges with mounting holes, 3.5" touch-screen, 6" range diffuse sensor w/ 3 meter cable, magnetic sensor mount and 3 meter output cable with flying leads.