SS7B481MDO by Danaher

The SS7B481MDO is a multi-channel through-beam sensing array supplied by Danaher within its Timers and Controllers series. Configured as matched emitter and receiver bars, the unit integrates into material-handling lines to detect objects passing between the two housings and to drive logic or safety interlocks in automation cells. Using discrete relay outputs, the array signals a PLC when any beam is interrupted, providing non-contact presence detection over long spans while keeping installation similar to conventional timer-based control hardware.

The sensing field is organized on 19.05 mm beam spacing, so any opaque target wider than that pitch can be registered. With 65 aligned channels, the array forms a curtain 1.24 m tall, giving broad vertical coverage on a conveyor edge. Infrared LEDs drive the emitters at a peak wavelength of 880 nm, a band selected for high immunity to visible-light noise. Because the design uses the through-beam method, both power and alignment govern operation, yet a rated sensing gap of 45 ft allows separation across large machinery openings. Once a beam is blocked, the electronics react in 30 ms, a response window that supports moderate-speed indexing while preventing nuisance trips. Minimum object sensitivity is 31.75 mm, matching the optical resolution implied by the beam pitch.

Detection results are transferred through two captive-contact relays, each rated for 10 A resistive loads, so the array can switch motor starters or lamp indicators directly. The contacts may handle line voltages up to 380 VAC, yet an internal 7 A fuse protects them from sustained overloads. The housing is fabricated from cold-rolled, 14-gauge steel and sealed with an epoxy powder coating that resists abrasion in factory environments. The assembly withstands ambient temperatures up to 55 °C, supporting continuous service beside ovens or presses without forced cooling.