Capacitive Sensors are immune to noise.

Turck, Inc. Jan 10, 2003

Press Release Summary:

Series BCF AC Sensors utilize fixed oscillator frequency combined with rectifier filter for noise immunity and exceed most specifications listed by CE. Oscillator allows sensor to maintain constant frequency, regardless of sensitivity adjustment. Fixed frequency is high enough to ignore most standard noise levels seen on plant floors. Sensors have 30 mm plastic housing. DC models are also available.

Original Press Release:

New AC Version Noise Immune Capacitive Sensor

Minneapolis, MN- TURCK Inc. has announced the introduction of the New AC version Noise Immune Capacitive Sensor ors "BCF"
sensors. These AC sensors incorporate the same unique filter principle as our DC versions, 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. TURCK's fixed oscillator allows the sensor to maintain a constant frequency regardless of sensitivity adjustment. This fixed frequency is high enough to ignore most of the "standard" 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.

Sensors in general have a very difficult time in electrically noisy environments and capacitive sensors are no exception. Electrical noise can have adverse effects on sensing devices and cause them to operate improperly and unreliably. The BCF capacitive sensors have been tested to a higher standard than required, exceeding most of the specifications listed by CE. These new BCF sensors are now available in 18 mm and 30 mm plastic barrel housings for DC and 30 mm plastic housing for AC.

TURCK is a leading supplier of advanced control solutions to help manufacturers improve their automatecd processes, products and profits. For other TURCK products or technical information, please contact: Application Support- Toll free: 800-544-PROX (7769). Visit us on the Web at: www.turck-usa.com or Email: sensors@turck.com