How does UV-C disinfect?

UV-C germicidal systems artificially generate a wavelength of 254 nm of light that destroys the DNA of microorganisms including viruses, bacteria and moulds. Once deactivated, these microorganisms are no longer able to reproduce and grow on surfaces.

Are UV-C rays harmful to humans?

UV-C rays do not cause permanent damage to the skin or eyes, but overexposure to UV-C rays can cause short-term skin redness and eye irritation.

If UV-C is not visible, what is the blue light emitted by the lamp?

UV-C is the invisible part of the light spectrum. The blue colour comes from the inert gas inside the UV-C bulb. The bulb can be lit (and blue) but does not produce UV-C energy.

Do UV-C rays degrade objects in the room?

UV-C light is a short wavelength light and does not penetrate most objects. Disinfection of hospital rooms does not accumulate sufficient exposure time to cause material degradation.

Can someone be in the room during a UV-C cycle?

No, UV-C is a powerful technology and should only be used when the room is unoccupied.

Can the room be occupied immediately after a UV-C disinfection cycle?

Yes, it is perfectly safe to enter the room after completing the cycle.

What happens when someone enters the room while the device is in operation?

The PHS device has infrared sensors and a people recognition system and the system switches off immediately.

How are the lamps cleaned when necessary?

Cleaning may be necessary if a lamp has been exposed to any form of hard water, high levels of wet organic debris or any form of oil (e.g. body oil). Vinegar can be used for mineral deposits and pure alcohol and a lint-free cloth for oil. Commonly available cleaners should work well if they leave no residue.

Is ozone harmful?

Several regulatory agencies, including the Occupational Safety and Health Administration (OSHA), have determined that the permitted residual safety level is 0.1 ppm (parts per million). Note that this permitted level is for continuous exposure over an entire 8-hour day. Temporary effects of such a low exposure range from headache, sore throat and irritation of the eyes and nose.

How does ozone kill bacteria?

Ozone kills bacteria by destroying the cell wall of the bacteria. Once the cell wall is destroyed, the bacteria will not be able to survive.