The Omron F3SG-4SRB1920-25 is a type-4 safety light curtain from the F3SG-SR series, rated for hand protection with a 25 mm detection capability. It uses 96 infrared beams at 20 mm pitch to create a 1920 mm protective height, covering access to hazardous machinery across a 0.3 to 20 m operating range. Powered by 24 VDC, the unit is sealed to IP65/IP67/IP67G — dust-tight, waterproof, and oil-resistant — making it suitable for washdown environments or machining cells with coolant mist. The wide -30°C to 55°C operating temperature range covers unheated factory floors and refrigerated areas.
The 25 mm detection capability is the key figure for hand protection per IEC 61496 — it resolves a 25 mm diameter object anywhere in the field, which is the standard for finger and hand safeguarding at access points. The 1920 mm protective height covers a typical standing operator's reach zone; the 20 mm beam pitch gives 96 beams, so there are no blind gaps between beams. The 0.3 to 20 m range covers most machine guarding distances. The 20 m maximum is the full rated range under clean conditions; the 0.3 m minimum is the blind zone close to the emitter. Blanking and muting functions are built in, allowing fixed obstructions (e.g., a fixture) to be ignored and the curtain to be temporarily overridden during material feed cycles.