The slot sensors of the SR21 series, with 2 mm slot width, are characterised by a high 12 bit (4096 steps) resolution, a low 20 µs response time and a switching frequency reaching 25 kHz. The setting of the switching threshold is carried-out automatically by simply pressing a push-button, or dynamically during label (or other reference) movement. The SR21-IR model with infrared emission is ideal for label or hole detection on continuous surfaces, while the SR21-RG model with double red or green emission suits colour print register mark detection on transparent films for automatic packaging
Strengths
High 25 kHz switching frequency IR or red/green light models Detection of semi-transparent labels Detection of register marks on transparents 4 wire antivalent NPN and PNP output
Applications
Packaging lines Sorting Wood working machines Glass working machines Automotive