Sensors & Transducers


Optical sensors without the 'blind' spot

October 2001 Sensors & Transducers

Banner Engineering produces the VS3 series retroreflective sensors designed to detect shiny objects accurately and eliminate the 'blind' response area of conventional photoelectrics. Self-contained VS3 sensors offer precision performance and exceptional range, making them well suited as replacements for remote and fibre-optic sensors in small feeder racks, conveyors and other space-limited applications.

Bifurcated lens separation creates a 'blind' sensing response area near the lens of conventional photoelectric sensors. Engineers have to account for this 'blind' area in the design of every application, because objects in this area will not be detected. VS3 sensors utilise coaxial optics to provide a complete sensing response area with no blind spots. This feature allows sensing targets to be placed as close to the VS3 lens as needed.

The VS3s' miniature size belies their powerful capabilities. Utilising a visible red beam, they provide a range up to 250 mm to the supplied retroreflector and repeatability of 160 µs with an output response time of 1 ms. The VS3 design includes an advanced circuit board for precision performance and coaxial optics that eliminate close-range blind areas.

Green and yellow LEDs provide constant indication of operating status. Steady green indicates - Power On, flashing green - Output Overload, and steady yellow - Light Sensed.

VS3 sensors are available in light operate (NO) and dark operate (NC) models with a choice of NPN (current sinking) or PNP (current sourcing) outputs. Internal circuitry guards against false pulse on power-up, continuous overload and short-circuit of outputs. The 10-30 V d.c. sensors feature 3-wire hook-up and provide a maximum output rating of 50 mA.

Housed in durable black ABS with an acrylic lens, the rugged miniatures tolerate vibration, mechanical shock and washdown and operate in temperatures of -20 to +55°C. The sensors are CE approved and meet IEC IP67 standard. They are available with an integral PVC-jacketed 2 m cable, or a 3-pin integrated Pico-style quick disconnect fitting. Stainless steel mounting hardware is included with all models. Optional mounting brackets are available.



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