Turck is offering its 'BCF' new noise immune capacitive sensor. These sensors incorporate a unique filter principle, making them immune to most industrial noise. This principle involves a fixed oscillator frequency combined with a rectifier filter providing superior noise immunity over the competition. Turk's fixed oscillator allows the sensor to maintain a constant frequency regardless of sensitivity adjustment. This fixed frequency is high enough to be insensitive to most of the common noise levels seen on plant floors. Electrical noise is mostly symmetrical which makes it easier to identify and separate from the sensor's input signal. The Turck rectifier filter is able to block this noise, allowing only the 'useful' input signal, which is in phase with the oscillator frequency, to pass.
Capacitive sensors were originally designed for use in areas where level detection applications were far away from other electrical equipment. As factory automation has become more prevalent throughout industrial markets, these capacitive sensors have moved into new environments where greater electrical noise levels exist. Various sources including variable frequency drives, electromechanical motors and standard walkie-talkie devices can produce electrical noise. These noisy environments can have adverse effects on sensing devices and cause them to operate improperly and unreliably. These two innovative electrical techniques give the best defence against industrial noise. The BCF capacitive sensors have been tested to a higher standard than required, exceeding most of the specifications listed by CE. The new BCF sensors are available in 18 mm and 30 mm plastic barrel housings.
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