Vision sensor selection depends on the inspection task, the working distance and field of view, lighting, and the output the downstream system expects. A vision sensor that is a perfect match for one packaging line may be the wrong tool a few feet down the conveyor.
Specs to confirm before ordering:
- Inspection task: presence/absence, pattern match, OCR/OCV, color, barcode/2D code, basic measurement
- Field of view at the planned working distance — fixed-focus sensors are sized for a specific window
- Resolution: 0.3 MP, 1.3 MP, 2 MP, 5 MP — higher resolution costs cycle time
- Lens focal length and lens variant (integrated vs. C-mount)
- Lighting: integrated ring or bar, or external lighting required
- Color vs. monochrome — color is needed only when color is the discriminator
- Communication: Ethernet/IP, Profinet, Modbus TCP, serial, discrete I/O
- Programming method (PC software vs. on-board UI) and licensing requirements
Common gotchas: a vision sensor will not magically work without controlled lighting — ambient sun and overhead fluorescents change the image and break inspections set up under bench lighting. Integrated lighting helps but is sometimes insufficient for the application; an external dome, backlight, or low-angle bar is often the actual fix. Pattern-match tools tolerate small variations, but the trained reference must come from a "golden" part — training on an already-defective unit teaches the sensor that the defect is normal.
Typical applications: label-present and label-correct on packaging, lot/date code OCR verification, fastener counting in a tray, color check of caps, and 2D-code reading on printed circuit boards. On legacy production cells, the exact vision sensor model is usually selected because of a specific lens/working-distance combination — a replacement of the same model carries forward that geometry. A different model usually means new brackets and re-teaching.
For obsolete vision sensors, send the OEM model and option codes for a quote.
