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EVS Signal tower

A groundbreaking innovation in LED technology opens up a completely new dimension in optical signalling. Enhanced Visibility System, or the electronic improvement of visibility, for EVS short, is the name WERMA has given to this latest development which promises to bring about a revolution in signal technology.

The flickering of neon lamps and comparable lighting effects are highly effective at attracting our attention. The neurobiological basis of this phenomenon is explained by a university scientist as follows: light signals are processed in the human brain, not directly in the eye. In order to be consciously registered there, incoming stimuli first have to pass through a form of filter. This filter has a ‘protective function’. During sleep it reduces disturbing stimuli to a minimum and assists in ‘overlooking’ regular or continuous signals.

Irregular light impulses can circumvent the brain’s filter function. Random light signals fail to generate an acclimatisation effect and the brain is unable to escape the stimulus, even when the flickering continues for an extended period.

On the basis of this understanding, WERMA’s R+D department set out to find a flickering light with a high degree of attracting attention. In a multistage laboratory experiment test candidates were asked to judge a series of different light signals and to determine the most eye-catching light. The result of the study was a stochastic flickering light with optimal attention-grabbing characteristics: EVS – Enhanced Visibility System. The light effect of this system is completely new and distinguishes it from all previous systems.

As a result of the extremely powerful signal effect, the EVS light is especially suited to signalling acute or highly important conditions. The EVS element can also be deployed in hazardous situations or in areas where immediate action is required.

For the EVS system WERMA employs light emitting diodes. A microprocessor generates random light signals. This gives the light a very ‘agitated’ character, which proves highly effective in drawing the attention of those in its vicinity – even when seen out of the corner of the eye.

Up to now LED signal devices have confined themselves to imitating the light effects of light bulbs or Xenon flashes, EVS however utilises the strengths of light emitting diodes. LEDs are capable of generating the required high flickering frequency with ease, frequencies which Xenon flashes for example are incapable of generating. There are a series of additional, classical advantage to LEDs – their resistance to vibration and shocks, their long life duration as well as their low energy consumption.

Werma UK

WERMA is the leading manufacturer of a wide range of Beacons and Sounders and accessories, often referred to as stack lights, signal towers and Andon systems. Products are designed and made at the HQ in Germany and the full range is available from its UK operation based in Wellingborough.

WERMA is the leading manufacturer of a wide range of Beacons and Sounders and accessories, often referred to as stack lights, signal towers and Andon systems. Products are designed and made at the HQ in Germany and the full range is available from its UK operation based in Wellingborough.

The range consists of signal towers and beacons available with both LEDs and filament bulbs together with a comprehensive range of sounders; sirens, buzzers and horns in a wide range of sound output levels.

Principal function is to provide optical and audible warning of machine fault or machine shop danger where such beacons and sounders are commonly installed.

Andon lights, as beacons are now commonly referred to, are often used as “call for action” systems to improve efficiency of for example line side supply of components. Manually operated lights alert remote departments wirelessly to resolve calls for action.

Many innovative features such as USB connectivity and wireless monitoring systems are also available.

There is also a comprehensive range of ex-proof signal products compliant with the latest ATEX directives.

The full range of products can be found on www.werma.co.uk where an Eshop facility is available for all major credit cards.

All WERMA products are manufactured to strictly controlled quality standards (DIN EN ISO 9001:2000).

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