The SICK GTB2S-P5451 is a G2S-series photoelectric proximity sensor with background suppression, using a visible red PinPoint LED to detect objects up to 120 mm away. At just 7.7 mm wide, it slides into tight panel gaps or machine frames where a standard 12 mm or 18 mm barrel won't fit. The PNP output switches light-ON, sinking up to 50 mA with a 0.6 ms response — fast enough for part-present sensing on a moderate-speed conveyor or pick-and-place station. Background suppression means it ignores the belt or backstop behind the target, so you don't get false triggers from shiny surfaces behind the detection plane.
Sensing range and what it means on the line
Minimum sensing distance is 2 mm; maximum is 120 mm. That 2 mm minimum matters when you're detecting thin parts passing close to the lens — the sensor won't blank out from a target right against the face. The 120 mm top end covers most pick-and-place and packaging applications without needing a reflector. The visible red beam makes alignment straightforward during commissioning; you can see the spot on the target instead of guessing with infrared.
Rugged enough for the route
Rated IP67, so it handles washdown splashes and dust without potting failure. The operating range runs from -25 °C to 50 °C — fine for a conditioned plant floor, but if you're mounting it near a hot bearing housing or a steam line, the 50 °C ceiling is the hard stop. Supply voltage is 10–30 VDC, which covers standard 24 V control power with plenty of headroom for line drop on long cable runs. Termination is a cable with an M8 connector, so a damaged cable swaps out without re-terminating the sensor head.