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Principles of operation: At SICK we differentiate Safety Light Beams into 4 principles of operation: the sender/receiver system; the twin concept; the active/passive design; and vision sensors. Our standard technology is the sender/receiver system. The sender unit emits a light beam which is detected by the receiver unit. This principle covers a range up to 90 meters. The twin concept is nice to handle. Sender and receiver are integrated in one housing so you just take two of a kind and twist one upside down. Now both senders emit the beams to each others receiver. The twin concept simplifies logistics by using the same unit twice. Active/passive systems combine a single sender and receiver in one housing called active side together with mirrors on the passive side that deflect the beam from sender to receiver. This solution has only one opto-electronic device so it is cost efficient. The vision sensor is especially made for small machines. While the device is mounted in a corner a re
