About UV-C light
About UV-C light
Ultraviolet rays are part of the natural sunlight spectrum. In the wavelength range of 253.7 nm (nanometers), they have germicidal effect on bacteria, viruses, yeasts and molds. Due to UV-C disinfection of air and surfaces, the microorganisms are inactivated effectively.
The innovative technology of UV disinfection results in direct advantages for the user:
- The technology of UV disinfection has no chemicals, no toxic compounds and no resistance.
- Undesirable microorganisms are inactive within seconds while retaining the product and the product properties.
- UV-C is so green, clean and efficient.
Ultraviolet radiation as visible light or radio waves, electromagnetic radiation and cannot be perceived by the human eye. It is defined as comprising the spectral range from 100 and 380 nm and closes thus directly to the blue, visible part of the light.
The ultraviolet spectrum covers wavelengths up to 380 nm and is divided as follows:
- UV-A 380-315 nm “black light”, the longest wavelength UV rays responsible for tanning of the skin
- UV-B 315-280 nm responsible for sunburn
- UV-C 280-200 nm disinfection
- UV-C-VUV 200-100 nm ozone formation
Ultraviolet radiation is present in the solar radiation. Because of absorption in the atmosphere (especially in the ozone layer) radiations penetrate with a wavelength above 300 nm – UV-A and above all a small part of UV-B to the earth’s surface.
The high-energy UV-C radiation causes a photochemical reaction. The wavelength at 253.7 nm is absorbed by the cell nucleic acids and lead, depending on the radiation dose to a molecular rearrangement of the micro-organism’s DNA, to kill or damage bacteria and fungal spores. The UV-C radiation is therefore targeted for degradation or destruction of microorganisms (e.g. bacteria / viruses, yeasts and molds) are used. Scholarly resources on the efficacy of UV-C is found in the literature and in reports of field applications, especially in the U.S. (NIOSH, OSHA, CDC, GSA, EPA is). Notable publications come from the University of Cincinnati, University of Tulsa, the University of Colorado and McGill University (Canada), to name a few.
The dose principle refers to the overriding influence of the factors of time and performance. The product of irradiation time and irradiation intensity is measured in:
UV-C dose (mWs/cm²) = intensity (mW/cm²) x time (s)
While simple structured organisms have a high sensitivity to UV-C radiation, meaning they can be easily disabled by a low dose, much more energy is needed to kill fungi and spores. The efficacy of UV-C in the inactivation of microorganisms is therefore always directly related to the applied dose. In this way disinfection rates up to 99.99% are possible.
Various factors such as residence times, temperatures and humidity have to be considered while development of UV-C devices.
flow-med used for the disinfection only special UV-C lamps that are not ozone-forming. The ozone formation is prevented by the use of special materials. The low-pressure lamp (<10 mbar) is a cold-cathode tube of a special glass filled with argon and traces of mercury vapor. Upon application of the ignition voltage, a plasma arc is formed in the spectral line of 253.7 nm as the dominant emission (> 90%). The UV-C bulb is rated for 10,000 hours life time. With a daily operating time of 8 minutes, the UV-C lamp has a service life of 20-years!
An important advantage of the physical UV disinfection is that it cannot cause resistance. The UV-C disinfection works even when germs already developed resistance to conventional disinfection procedures, such as alcohol, antibiotics or others.
The ultraviolet disinfection works for all microorganisms, regardless of whether it is common Escherichia coli (7000 mW S/cm2), Salmonella typhosa (6000 mW S/cm2), SARS, Legionella or mold. An accurate UV-C dose, an optimized device design and years of application know-how are the qualification for the desired result.
In too high doses UV-C radiation causes redness (erythema) in human skin and inflammation of the eyes. For this reason, the limit is not exceeded. Safeguards, sensors, shielding the drying chamber by suitable plastic materials, such as Makrolon® and opaque materials provide maximum protection. flow-med is in compliance with all international safety standards tested with certificates by TUV/GS, FCC, CE, and STC. The STC certificate proves the microbial reduction of bacteria by 99.9%. All certificates can be viewed on request.
Bacteria and germs are becoming more common and pose a significant health risk. Moisture and body secretions are a good breeding ground for colonization and multiplication of bacteria. The hygienic cleaning with UV-C light prevents irritation and infection risks from the ear. The fitting process and acclimatization runs without complications. The clinical cleanliness is the best guarantee for the preservation of health.
The daily use of flow-med products with UV-C in combination with the perfect drying also provides maximum protection and value for the hearing aids. The risk of failure, repair costs can be reduced, lifespan and the usability of the hearing aids will be increased.