DIN rail mounting radio frequency interference filter and transient voltage suppressor for voltage and current loop analogue and digital process signals

For all two wire twisted pair applications
Combines radio frequency filtering and voltage transient protection in one unit

Aids conformity to the EMC directive on RFI and ESD immunity and emissions

The OneStop Filter

Comprehensive radio frequency interference protection is the most important first stage in protecting signal input and output lines from all types of interference and is a prerequisite for good voltage transient immunity. A simple voltage transient protector will do little for radio frequency immunity unless combined with a band stop filter effective from down to at least 50 kHz and up to in excess of 100 MHz for protection from the commonest sources of interference.

Applications include uprating existing products specified only to EN50081 part 1 and EN 55022 Class B for emissions and EN 50082 part 1 for immunity (residential, commercial and light industrial) to part 2 and class A (full industrial). Also for upgrading to EN 55101/EN 55024 immunity. In addition, the filter enables sensors and transducers that give outputs in the millivolt range, or exhibit a variable resistance characteristic, to have their signals taken some distance to a point where amplification and processing can be conveniently carried out, while maintaining good rejection to external sources of interference.

The OneStop filter is designed to mount on 32mm asymmetric or 35mm symmetric DIN rail and provide protection against the following:

With the greater use of PLCs and digital signal processing modules in industrial process environments, greater attention has to be given to signal conditioning of the standard voltage and current loop analogue and digital input and output signal lines, particularly when they are routed over long distances or are connected to noisy sources such as invertors. The bi-directional design of the OneStop filter not only protects the equipment from external sources of interference, but also minimises any problems due to interference generated by the equipment itself being conducted back along the signal lines.

Solid state analogue and associated processor based systems are potentially suseptible to all types of interference be they random pulse events or continuous in nature. This can disrupt the function of the equipment and often result in complex and unexpected failures.

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Conford Electronics Conford Liphook Hampshire GU30 7QW England
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