When relying on a disinfection system to prevent the spread of diseases, it’s important to check that the system is operating to its specifications. Like any thing else, normal wear and tear can impact the performance of a disinfection system. Dirt and grime can build up on lamps and reflectors causing less light to reach surfaces. Lamps can get knocked out of alignment causing shadowed areas that are not fully irradiated. And lamp aging can result in both light loss and spectrum shift - meaning neither the right amount of light nor the right wavelength of light is reaching its target. Verifying not only that the system is performing, but at what level, can help users quickly and easily identify and address problems.
Lastly many UV systems operate in enclosed environments where visually watching the process is not safe or easily possible. Even if visually monitored, UV light is invisible to the naked eye. You cannot simply “look” at the light source and know that it is working properly. Light measurement devices allow users to quickly, easily, and safely validate the performance of their system. A good light measurement system will:
Confirm the amount of light reaching a surface
Calculate the dose in Joules or J/cm
Graph the output over time
Validate the Min/Max and Average Irradiance (mW/cm2)
Save the results for exporting to your PC for additional analysis
Good light measurement systems will further simplify the process through features such as auto-ranging. This feature automatically detects the input range so users don’t have to manually dial it in. Meters with simple user interfaces with only a few buttons will let them easily toggle between readings. LCD display screens will let users see in graphical terms the changes in light uniformity over time. Meters that carry an ISO17025 accredited and NIST traceable calibration certificate provide the added assurance that readings are accurate and reliable.
Key Takeaways
Ultraviolet Germicidal Irradiation is an efficient and effective means of disinfection. There are many UV disinfection systems on the market designed specifically for elevators. Many elevator manufacturers are beginning to incorporate this capability into their new systems. A good light measurement tool is an excellent compliment to any UV disinfection system. While you should be able to trust the manufacturers specifications, it is always good practice to verify them.
