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RIGHT INTENSITY FOR UVGI TO KILL MICROORGANISMS

Article By MG Cooling Solutions In UVGI - May 25, 2021

Ultraviolet germicidal irradiation (UVGI)  is a method of disinfection in which short-wavelength ultraviolet light (UV-C) is used to kill microorganisms by disrupting their DNA and RNA so that they will not be able to replicate. UVGI devices can generate strong enough UV-C light in the circulating air or water to make their environment inhospitable to bacteria, viruses, mould spores and other pathogens. UVGI for disinfection and sterilisation has been an accepted practice since the mid-20th century, primarily used in medical sanitation and sterile work facilities but now UVGI has found a renewed application in air purifiers.

When UV-C fixtures or UVGI devices are used to disinfect surface, objects and the environment it is important to determine the right intensity to kill microorganisms so that the right dosage and time can be calculated. The intensity of UVGI/UV-C devices is defined as the overall power of the lamp and designated in watts. Intensity refers to total lamp output across the entire electromagnetic spectrum. The intensity of UV radiation is measured in the units of milliwatts per square centimetre (mW/cm2) it is the energy per square centimetre received per second. It can also be measured in the units of millijoules per square centimetre (mJ/cm2), which is the energy received by the unit area in the given time.

The manufacturers of UVGI devices provide the intensity of lamp or fixtures at a given distance. The UV intensity is specified for each lamp at a distance of 1 meter. UV intensity is inversely proportional to the square of the distance so it decreases at longer distances and rapidly increases at distances shorter than 1m. The degree of inactivation of microorganisms by UV radiation depends on the intensity of light applied to the source. It is important to calculate the right amount of intensity so that the dose and time of exposure can be found out to kill the microorganisms of the given source. The intensity of the sources given in power per unit area (W/cm2). The higher the intensity the less time it will take to kill pathogens like virus and bacteria. UVGI devices with a lower intensity will take a longer time to get the same level of disinfection. A high-power UV unit will clean your space quicker than a low power unit.

The Intensity of UVGI devices gradually declined during use thus reducing their efficiency so it is important to measure the intensity of the disinfecting ultraviolet rays. Once the intensity drops below the required levels it should be replaced this makes it important to use a UV radiation meter to detect the intensity of UV radiation. UV intensity meter is a UV light measurement device used to find out the intensity of ultraviolet radiation.UV intensity meter is based on the principle of photoelectric conversion.

MG COOLING SOLUTION is a leading HVAC enterprise that understands the value of bacteria and virus free air in these pandemic times. Our qualified engineers will examine your space and recommend the best UVGI devices suitable for your space. We will provide easy installation and timely maintenance so that your device will work effectively and have a longer life

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