Photoelectric Fork sensors SR23 Series

Datasensing SR23 Series

The SR23 Series delivers a robust family of fork-slot photo-electric sensors, engineered for precise detection of labels, film gaps and multilayer materials, extremely narrow slot geometry, and rapid reaction times. With its 5 mm slot width and 50 mm depth, minimum detectable object/gap down to 0.5 mm, switching frequency up to 12 kHz and response times around 40 µs, this series provides exceptional speed, high repeatability, and compact integration in demanding automation environments.

Design & Functionality

• The sensors feature a 5 mm slot width and 50 mm slot depth, suitable for standard labels, booklet multilayers and film gaps. 
• Optical/operational highlights include:
  • Minimum detectable object/gap of 0.5 mm, enabling very fine detection of labels or transparent gaps. 
  • High switching frequency of up to 12 kHz, and response time approx. 40 µs, supporting high-throughput conveyor and printing applications. 
  • Setting via single push-button (Teach-In or dynamic) enabling quick adjustment during running webs or production. 
• Mechanical & environmental features:
  • Compact metal housing (Zamak / aluminium + PBT), with typical dimensions ~11 × 25 × 64 mm or ~30 × 63 × 10 mm depending on variant. 
  • Protection rating IP65, designed for machine-side mounting in labelling, packaging or printing equipment. 

Total Crossed Beams

(In this context, this term is interpreted to mean that the sensor provides full and stable detection coverage through the fork slot rather than literal crossed beams.)

• The SR23 Series ensures a stable detection zone across the slot aperture, allowing for reliable detection even when labels or gaps vary in position or material.
• The combination of ultra-narrow slot width (5 mm) and fast switching makes it especially well-suited for high-speed label applicators, film print mark detection, multilayer booklet label detection and other packaging operations where precision, speed, and minimal physical space are required.

Beam Pitch Options

(Here interpreted as variant options of slot width/depth/detection variant rather than literal beam pitch.)

• The standard slot width is 5 mm / slot depth 50 mm. 
• Other versions may support alternate slot widths or depths for narrower gaps or different label types (subject to variant selection).
• These variant options allow you to choose an SR23 model that matches your label width, gap clearance, web speed and mounting constraints—offering design flexibility.

Intrinsic Synchronism

• The emitter, detector and electronics are fully integrated in one compact housing—no external synchroniser required—simplifying wiring and reducing component count.
• With built-in push-button setting and compact housing, the SR23 supports fast commissioning, low-maintenance operation, and fitment into tight automation frames.

Operational Advantages

• Fine detection capability: With minimum object/gap detection capability down to ~0.5 mm, the SR23 excels at detecting small label gaps, transparent materials or multilayer booklet labels.
• High throughput readiness: With switching frequency up to ~12 kHz and response times around ~40 µs, the sensor keeps pace with fast-moving packaging lines and labelling systems.
• Compact and robust: The metal housing, IP65 rating and narrow slot geometry allow deployment in machine side-frames or constrained mounting spaces without sacrificing performance.
• Applications: Ideal for label detection (single/multilayer), film gap detection, print-mark registration on transparent reels, web handling systems, automatic labellers and packaging machines where slot-sensor format, high speed, and precise detection are required.