Diffuse background suppression (BGS) photoelectric sensors are used in applications where accurate differentiation between the target and potentially interfering backgrounds is required.
However, it remains important to detect only the target, regardless of the colour, surface and shape of both the background and the target.
Contrinex says that it all-new series 3131 range sets new standards in this field. Tough and compact, these sensors are built in a package measuring only 30 x 30 x 15mm and have a long sensing distance of 200mm. The precision background suppression can be adjusted in small increments down to 15mm and, because the sensors have a very small blind zone, targets can be sensed down to 1mm from the lens. Most importantly, the sensors are immune to the colour, shape and surface texture of the background beyond the set target detection point, thereby ensuring stable, long-term reliability.
The series 3131 sensors have a red spotlight that helps alignment to the target, an amber LED that indicates detection, and a green LED that confirms the optimum set-up. A 12-turn potentiometer allows extremely accurate setting of the background cut-off position and a narrow, focussed beam prevents the detection of any adjacent objects or unwanted features that are close to the target.
These new Contrinex sensors have a high immunity to stray light sources and voltage overload, short circuit and induction spike protection. Operating frequency is 500Hz, switched current rating is 200mA, they have a wide operating supply voltage from 10-36V DC, a stable operating temperature range of 25 to 55 degrees C and they are sealed to IP67.
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