DSA (Safety) / DSE (Security) Infrared Curtain Sensors
DSE's are security devices for protecting perimeters such as patio doors or shop fronts. Two or more beams must be broken to trigger an alarm. A jumper link selects one of two frequencies to allow two sets to be used near each other.
DSA's are dual purpose, for security and safety, selected by jumper. Beams are paralleled and crossing to create a multi beam matrix. Only one beam need to be broken to switch the output.