How to Ensure the Germicidal Effect of UV Germicidal Lamps?
Resumption of production has gradually begun to approach. How do we disinfect personal belongings such as mobile phones when we return home after work? In the "Diagnosis and Treatment Program for Pneumonia of New Coronavirus Infection (Trial Fifth Edition)" issued by the National Health and Medical Commission, the virus was specifically mentioned to be sensitive to ultraviolet rays and heat, 56 ° C for 30 minutes, ether, 75% ethanol, chlorine-containing disinfectant fatty solvents such as peracetic acid and chloroform can effectively inactivate the virus.
With the increasing sales of various alcohols and disinfectants, ultraviolet disinfection equipment has come to everyone's sight. According to authoritative media reports from the United States Airlines, in order to curb the rapid spread of the new coronavirus NCP, major US airports have upgraded their surveillance and prevention methods. Recently, Los Angeles International Airport, San Francisco International Airport and New York John F. Kennedy International Airport have enabled UVC ultraviolet sterilization robots to fully sterilize and disinfect all internal cabins of aircraft entering and leaving Hong Kong to effectively prevent the spread of the new anti-coronavirus NCP. So what is the principle of UV disinfection? Today we come to understand the basics of UV-killing coronavirus.
Ultraviolet rays are invisible because they are located outside the violet region of the spectrum. In fact, even without the arrival of the new crown virus, ultraviolet light has always been a front-line force for disinfection and sterilization. The UVC wavelength of ultraviolet rays is 200 ~ 275nm, which is called short-wave sterilized ultraviolet rays. Ultraviolet disinfection technology has unparalleled sterilization efficiency of other technologies and the sterilization efficiency can reach 99% ~ 99.9%. The scientific principle of ultraviolet disinfection: It mainly acts on the DNA or RNA of microorganisms, destroys the structure of DNA and RNA and makes it lose the function of reproduction and self-replication to achieve the purpose of sterilization. The "new crown virus" we are encountering today is an RNA virus, so ultraviolet radiation has a certain effect on killing it.
We also need to understand the concept of the ultraviolet radiation intensity. The ultraviolet radiation intensity refers to the intensity of ultraviolet radiation measured per unit area at a specific distance from the centerline of the ultraviolet germicidal lamp tube surface, the unit is μW / cm².
To put it simply, for our daily use of ultraviolet disinfection equipment, especially for ultraviolet lamps, the distance is an important factor in determining the anti-virus effect under the premise of the same light source: the closer the object is to the lamp, the higher its intensity and distance. The further away, the worse the effect. The state stipulates that the radiation intensity of a 30W straight tube needs to reach 70μW / cm² in order to pass the sterilization effect and the new tube needs to reach 100μW / cm² or more.
To achieve a good sterilization effect, we need to use a professional UVC light meter to test the intensity of the UV germicidal lamp. The LS126C UVC light meter independently developed by Linshang Technology is definitely the leader among UV instruments on the market. The instrument is also constantly upgraded and the function of the instrument is more perfect. The latest version of the LS126C UVC light meter comes with Bluetooth and can be connected to a dedicated mobile phone app to achieve wireless monitoring of UV intensity. No longer need to wear thick protective clothing to detect data. The instrument uses high-precision UVC filters and professional UV sensors to eliminate the effects of UVA and UVB bands, making the data more accurate.