The biological safety cabinet is an air purification negative pressure safety device.Its main function is to prevent aerosols from being contained in dangerous or unknown biological particles during the experimental processing operation.Biosafety cabinets are mainly used in microbiology,genetic engineering,biomedical,biological products and other industries.It is the most basic safety protection measure in the primary protective barrier in the laboratory.
The disinfection cabinet needs to be sterilized after using,otherwise the residual nutrient medium will provide growth conditions for the microorganisms.Cause certain toxins or have safety hazards.The most common way to sterilize on the market today is UV sterilization. Biosafety cabinets are divided into different models according to user needs, so the UV lamps used in biosafety cabinets are mainly 4W, 6W, 8W and the UV lamps used for sterilization are ozone-free UV lamps, specifically UVC with a peak wavelength of 254 nm.
Ultraviolet rays can kill various microorganisms including mycobacteria,viruses,fungi, mycoplasma,etc.Any surface contaminated by the above fungi can use ultraviolet disinfection. The penetration of ultraviolet light is relatively weak and it can only directly kill the surface of the irradiated microorganisms.Therefore,we need to completely expose the disinfection site to the germicidal lamp during the anti-virus.
Under the same environment,if the energy value of the ultraviolet germicidal lamp is not up to standard,it will not have a good sterilization effect.UV germicidal lamps for biosafety cabinets are generally required for irradiation intensity.The specific requirement is that the measurement data by the UVC meter reaches 100 μw/cm 2.However, the 70μw/cm2 ultraviolet germicidal lamp on the market accounts for 50%-80%.Compared with the Ministry of Health's disinfection technical requirements,the pass rate is less than 50%.
The irradiation intensity of some units of ultraviolet germicidal lamps is less than 70μw/cm2 measured by UVC meter and even the 40μw/cm2 lamps is still in use. In fact, such germicidal lamps have no effect.It is said that the sterilization effect is not achieved. Because microorganisms are capable of repairing damage, substandard UV irradiators can only kill microbes and cannot kill them.Microorganisms are intact after the injury has been repaired.
After the above content, we learned that in order to achieve a satisfactory sterilization effect,the importance of testing the irradiation intensity of the germicidal lamp by an UVC meter.LS126C is an UVC meter specially used for energy detection of ultraviolet germicidal lamps.The spectral response ranged from 230 nm to 280 nm with a peak wavelength of 254 nm. It is also possible to display the maximum value,minimum value,average value,real-time power value, measurement duration, real-time clock.The instrument also has the following features:
(1) LS126C UVC meter has Bluetooth and mobile APP,which can monitor data wirelessly from a certain distance. Avoid on-site detection of UV burns.
(2) The instrument comes with a real-time clock,which can trace the specific time of the measurement results.
(3) The instrument can set timed shut down and the measurement data is automatically saved when the machine is turned off.
(4) The instrument is equipped with USB communication port and dedicated PC software. After the measurement is completed,the measurement data can be exported and a report can be generated.
The Linshang LS126C UVC meter uses an advanced digital probe.The digital signal is directly dealed on the probe and is not susceptible to interference,ensuring the measurement accuracy.