Area sensor selection is driven by the protective height (sensing length), beam pitch (resolution), the application output (analog height, beam-status data, simple presence), and the communication interface. Area sensors are not light curtains — using a measurement area sensor where a safety light curtain is required is a code violation.
Specs to confirm before ordering:
- Sensing length (the protected height) — from 150 mm to 2400 mm typically
- Beam pitch / resolution — typically 5 mm, 10 mm, 20 mm, or 40 mm; smaller pitch detects smaller objects
- Operating range emitter-to-receiver — typically 0–3 m for shorter sensors, longer for high-power variants
- Output: simple PNP/NPN (any beam blocked = output on), first/last beam blocked (height measurement via beam count), full data via IO-Link or serial, analog 0–10 V / 4–20 mA proportional to beam-block position
- Scan time — for moving objects on a conveyor, scan time vs. conveyor speed determines what passes detection
- Operating modes: any beam, all beams, first beam, last beam, count, math (sum)
- Cross-talk avoidance for multiple area sensors operating near each other
- Mounting accessories — standard brackets, side mounting, edge mounting
- IP rating — IP65 standard, IP67 for splash environments
Common gotchas: measurement-grade area sensors look very similar to safety light curtains and are sometimes mistakenly installed in safety applications — they are not Type 2 or Type 4 rated under IEC 61496 and provide no safety function. Beam pitch determines minimum detectable object: a 20 mm pitch will not reliably detect a 10 mm object. Scan time is critical on fast conveyors — a 16 ms scan time on a 2 m/s conveyor moves the part 32 mm between scans, which may miss short parts. Cross-talk between adjacent area sensors causes nuisance triggers; sync wiring or sufficient separation distance is required.
Typical applications: height inspection of products on a conveyor, beam-count for parts profiling, detection of any-portion of an object passing through a zone, presence detection of bulk material in a bin opening, and overhead crane load profiling. For legacy installations, exact OEM area sensor replacement preserves the bracket mounting and the controller's expected output format.
For obsolete area sensors, send the OEM part number for a sourcing quote.
