UV filters

WHAT ARE UV-C RAYS ?

The small part of electromagnetic spectrum having wave lengths included between 100 and 400 nm (thousandths of micron) is defined as space of the ultraviolet irradiation. The UV-C are part of the subspace characterized by the wave lengths included between 100 and 280 nm. Electromagnetic waves with different wave length and width induce interactions with the matter of different nature, the UV-C irradiation with = 254 nm is particularly interesting thanks to its marked germicidal power.

WHY DO THEY WORK ?

The high germicidal power of this wave length must be sought in DNA and in the link of its fundamental components (nucleotides). DNA is a macromolecule present in all living organisms in which all information necessary for life and reproduction reside. The alteration, induced by the UV-C irradiation, of some chemical links present among nucleotides is able to change the information contained and conveyed by DNA, these alterations prevent its normal activity and this irreversibly leads to the cellular death.

HOW MUCH DO THEY WORK ?

For being effective in the sterilization, an electromagnetic wave, besides being of a certain kind ( = 254 nm) it must possess also a minimum value of intensity to be able to ensure a minimum dose to water. The parameters which mostly influence the calculation of the dose are: P=power of the UV-C lamp, T=time of exposure (which depends on the flow-rate and on the dimensional characteristics of the unit), exp(-kx)=transmission factor (depending on the distance of the UV lamp and on the transparency of water), CT=temperature coefficient of water. A UV sterilizer, if correctly sized, is able to give water a dose sufficient for reducing almost all the commonest microorganisms present in water.

HOW ARE THEY PRODUCED ?

In nature the UV-C rays are part of the secondary cosmic irradiation which, interacting with the high strata of the terrestrial atmosphere, generates ozone and with a lower energy, it reaches ground as tanning UV(A+B) irradiation. Artificially UV-C rays are produced with the help of special fluorescent lamps containing mercury fumes, these lamps are made of a very pure quartz (>99.99% SiO2) transparent to the UV-C light which they emit in an almost monochromatic form (>95% of = 254 nm).

WHY ARE THEY CONVENIENT ?

Among the several advantages offered by this kind of technology we mention:

			WHAT ARE UV-C RAYS ? The small part of electromagnetic spectrum having wave lengths included between 100 and 400 nm (thousandths of micron) is defined as space of the ultraviolet irradiation. The UV-C are part of the subspace characterized by the wave lengths included between 100 and 280 nm. Electromagnetic waves with different wave length and width induce interactions with the matter of different nature, the UV-C irradiation with = 254 nm is particularly interesting thanks to its marked germicidal power. WHY DO THEY WORK ? The high germicidal power of this wave length must be sought in DNA and in the link of its fundamental components (nucleotides). DNA is a macromolecule present in all living organisms in which all information necessary for life and reproduction reside. The alteration, induced by the UV-C irradiation, of some chemical links present among nucleotides is able to change the information contained and conveyed by DNA, these alterations prevent its normal activity and this irreversibly leads to the cellular death. HOW MUCH DO THEY WORK ? For being effective in the sterilization, an electromagnetic wave, besides being of a certain kind ( = 254 nm) it must possess also a minimum value of intensity to be able to ensure a minimum dose to water. The parameters which mostly influence the calculation of the dose are: P=power of the UV-C lamp, T=time of exposure (which depends on the flow-rate and on the dimensional characteristics of the unit), exp(-kx)=transmission factor (depending on the distance of the UV lamp and on the transparency of water), CT=temperature coefficient of water. A UV sterilizer, if correctly sized, is able to give water a dose sufficient for reducing almost all the commonest microorganisms present in water. HOW ARE THEY PRODUCED ? In nature the UV-C rays are part of the secondary cosmic irradiation which, interacting with the high strata of the terrestrial atmosphere, generates ozone and with a lower energy, it reaches ground as tanning UV(A+B) irradiation. Artificially UV-C rays are produced with the help of special fluorescent lamps containing mercury fumes, these lamps are made of a very pure quartz (>99.99% SiO2) transparent to the UV-C light which they emit in an almost monochromatic form (>95% of = 254 nm). WHY ARE THEY CONVENIENT ? Among the several advantages offered by this kind of technology we mention: environmental treatment (without addition of chemicals, without alteration of taste) no danger of overdosing and no alteration of the characteristic of water quick action (without any stocking tank) the time is the one of passing through the sterilizer compatibility with the other technologies (filtration, softening, etc.) for a complete treatment of water cheapness and practicalness thanks to the low consumption of electrical energy and to the little required servicing
RACK LCD series Flow : 6 to 20 m³/h

RACK 80 series Flow : 30 to 345 m³/h

RACK 200 series Flow : 55 to 680 m³/h

SMP series Flow : 40 to 1200 m³/h

COMBI series (filter + UV) Flow : 6 to 135 m³/h

Cartridge filters GE series Flow : 16 to 135 m³/h
GEM series Flow : 6 to 70 m³/h