The amplifiers have a 0 to >200-mm sensing range, depending on the optical fibers used.

Operating distance can be adjusted between 20 and 200 mm with a 12-turn potentiometer with an illuminated scale. The switching output can be set to either light or dark-ON directly on the device. The amplifiers have additional excess light output, are insensitive to environmental influences, and are available with both red and blue light (sensing range of >mm, adjustable from 20 to 100 mm).

Contrinex Inc., 2 Business Park Rd., Old Saybrook, CT 06475, (866) 289-2899,