UV Sterilization Principle and UV Lamp Measurement
1. UV sterilization principle
Ultraviolet sterilization is to destroy and change the DNA (deoxyribonucleic acid) structure of microorganisms through the irradiation of ultraviolet rays, so that the bacteria immediately die or can not reproduce offspring to achieve the purpose of sterilization. UVC is the real bactericidal effect, because the C-band UV is easily absorbed by the DNA of the organism, especially the UV of about 253.7nm.
Ultraviolet germicidal lamps have two main spectral lines: 254nm and 185nm. 254nm ultraviolet rays can kill bacteria by irradiating the DNA of microorganisms. 185nm ultraviolet rays can change O2 in the air into O3 (ozone). Ozone has a strong oxidizing effect and can effectively kill bacteria. The disadvantage of dead angle is that it spreads and disinfects along a straight line.
Ultraviolet sterilization is a pure physical sterilization method, which has the advantages of simplicity, convenience, broad-spectrum efficiency, easy management and automation. With the introduction of various new-designed ultraviolet lamp tubes, the application of ultraviolet sterilization continues to expand.
2. Ultraviolet tube intensity tester measurement method
There are two main methods for monitoring the intensity of ultraviolet light tubes, the ultraviolet indicator card measurement method and the UVC detectormeasurement method. The former method is directly determined by comparing colors and the latter method is using an instrument.
Different UVC detectors have different measurement method. Let's take the Linshang LS126C UV intensity tester as an example to describe the UV lamp intensity monitoring method.
3. Measuring method of UVC detector
a. Place the instrument on the automatic hook, with the light-sensitive surface of the probe facing upwards and adsorbed on the iron piece. Short press the power button to turn on the instrument(the instrument enters the historical data query interface) and short press the power button again to enter the measurement interface.
b. Stretch the hooks (all hooks are straightened to one meter) and hang vertically at a distance of one meter below the middle of the tube.
c. A person stays away from the ultraviolet lamp and turns on the germicidal lamp for testing. Check the measurement results after ten minutes of testing. After ten minutes, the instrument has automatically shut down. Press the power button to turn it on (the instrument enters the historical data query interface). Open NO.1 and you can see the test data just now.
4. Mobile APP real-time monitoring method
a. Download and install the APP on your mobile phone. Short press the power button to turn on the instrument (the phone will display the SN number when you turn it on, check the SN number).
b. Open the mobile app to enter the search interface and click "Start Search" in the upper right corner. Find the SN number that is consistent with the testing instrument in the searched device and click. Then the APP will bind this device and jump to the measurement interface (the upper right corner will display the connection success).
c. Place the instrument on the test hook and press the measurement button. Hang the hook one meter below the center of the tube, leave the test site, turn on the germicidal lamp and start measuring. You can monitor the data in real time by opening the mobile APP.
The above is the method for monitoring the intensity of ultraviolet lamps. The monitoring method for test jams is relatively inaccurate and does not have a clear value. Especially for some color-weak people, it is impossible to distinguish accurately. Therefore, if you want to accurately monitor the intensity of UV lamps, it is recommended to choose a professional UVC detector.