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Contrinex’s Unique Transparent-object-detection Sensors Give a Blistering Performance
Contrinex offers both standard transparent-object-detection sensors using red light and a unique solution using Ultraviolet light to provide much more consistent & robust switching because UV light is absorbed by transparent plastic and glass objects.
Contrinex’s small, powerful and unique C23PA UV transparent-object detection sensors at only 20mm x 30mm x 10mm, with a long sensing distance of 1.2m, and auto-collimated optics that ensure there are no blind zones. These sensors were easy to mount inside a thermoforming machine to detect the presence of the formed shapes.
The sensor’s ultraviolet light at a 275nm wavelength is optimised to detect commonly used plastics. It uses a patented reflex operating principle with polarised ultraviolet light with a 275nm wavelength. This wavelength maximises the absorption of the polarized UV light by a range of commonly used plastics, to optimise the sensor’s performance.
The sensor also benefits from being resistant to interference from dust, liquid droplets and splashes, which commonly disturb transparent-object-detection sensors. Custom-designed reflectors use high-technology plastics to provide both excellent reflective properties and resistance to ageing by UV-light.
The customer took advantage of an option of the sensor which offered a second switched output for the ‘stability alarm’. This preventative maintenance function which is also available over IO-Link, signals when the sensor sees 20 consecutive poor detections and is deactivated by 20 consecutive good detections. Whilst the sensor and the machine continues to work normally, the ‘stability alarm’ forewarns of a problem, and hence is sometimes referred to as the “come, clean me” warning output.
The Ecolab-certified sensors are available with choices of PNP/NPN, Light-on/Dark-on, Cable or Socket, and can be adjusted using a teach button or IO-Link. They exceeded the customer’s need for reliable operation with little or no manual intervention and so were highly cost-effective.
Part of the C23PA family of photoelectric sensors, which include conventional visible-light-based transparent-object-detection and four other photoelectric sensing technologies to give designers a wide choice of interchanged sensors.
https://www.PLUSAutomation.co.uk
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