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The IRB-MON is a thru-beam photo eye and is an external entrapment protection device type B1, non-contact sensor for use with automatic gates and doors. The light beam is near infrared and pulses at a rate of 300/second (300Hz). IRB-MON provides a signal to the gate or door operator that the beam is not obstructed. The operating range is up to 115ft. The IRB-MON operates over a wide range of 6-35VDC and 12-24VAC. A green alignment indicator on the receiver provides status information at a glance, making set-up and alignment easy.