SS7B-481MDOR by Danaher

The SS7B-481MDOR is a through-beam photoelectric sensor array produced by Danaher as part of its Timers and Controllers series. Designed as a light curtain with aligned emitter and receiver bars, the unit detects interruptions in its infrared beams to signal the presence of an object on a conveyor, in a palletizer cell, or at a packaging station. Within automated equipment, it provides relay outputs that can trigger downstream logic for counting, gating, or interlock tasks.

The array projects 65 parallel beams with a spacing of 19.05 mm between adjacent beams. Objects that meet or exceed the stated minimum size of 31.75 mm reliably block at least one beam. With a maximum sensing span of 45 ft, the emitter and receiver can be mounted across medium-sized in-feed zones without mirrors. When a beam is interrupted, the system responds within 30 ms, which is suitable for detecting objects moving at typical conveyor speeds. The housing contains 2 captive-contact relays that change state when detection occurs, allowing separate connections to control circuits. The device accepts a standard input frequency of 50/60 Hz throughout its supported supply range.

Control power is supplied at 115 VAC, and each relay can carry up to 10 A. The voltage across the relay contacts may reach 380 VAC. A separate 7 A fuse rating supports coordinated circuit protection when the device is wired with appropriate protective equipment. The enclosure is made from cold-rolled steel and finished with an epoxy powder coating that resists abrasion and coolant splashes. The unit can operate at ambient temperatures up to 55 °C. Its captive-contact relay design prevents manual repositioning of the armature. Factory-set brackets maintain the alignment of the through-beam optics and preserve consistent spacing between the projected beams during normal machine vibration.