Introduction

This project is based on Ultraviolet Germicidal Irradiation (UVGI) which is a disinfection method that uses  short-wavelength ultraviolet (ultraviolet C or UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unable to perform vital cellular functions. UV-C based disinfection is widely used in water and air purification.

UV-C disinfection is widely seen in household as well as industrial and municipal water filters. UV-C is also used in disinfection of surfaces in bio-medical environments and has recently been used in disinfecting aeroplane cabins by Honeywell.

The same concept is being used here to disinfect groceries, mobile phone, wallets, keys, masks and any other object that can transmit microorganism and pathogens.

Due to COVID-19 pandemic it has become very risky to even buy groceries and products that can get easily surface contaminated with Coronavirus. The UV Chamber is an effective way to increase the personal safety at home.

This project is very cheap and easy to build at home. I hope this hopes you and your family to fight COVID-19.

Disclaimer / Safety Information

UV-C is not just harmful for microorganisms but also to humans and other organic life. UV radiation should not be exposed to living body as it caused DNA fragmentation thus causes Cancer and Eye damage.

It is important to carefully handel the UV-C tubelight and should not break as it contains Mercury (Hg) which is toxic.

Wihe handeling UV Chambers always cover the box so that no radiation can escape.

Hardware Bill of Materials

Schematic

Philips UV-C Tubelight Connection Diagram
Philips UV-C Tubelight Connection Diagram

Step by Step Guide

Time needed: 2 hours.

  1. Cardboard Box Selection

    The size of the cardboard should be big enough to accomdate all the materials and also should leave enough space to reflect the UV light around the objects.

    UV Disinfection Box

  2. Aluminium Foil

    Use scissor to cut the foil to proper size.

    Aluminium Foil, Glue and Scissor

  3. Sticking the Aluminium Foil

    Use craft glue to stick the alumunium foil on the inner surface of the cardboard.

    Glue Application inside the UV Box

  4. After Sticking the Aluminium

    All the 5 surfaces and the top flaps need to be covered.

    Partial Covered Aluminium foil inside UV Box

  5. Wiring the Ballast

    Connect the Red Connecctor with the two pin power connector. Connect two pair of wire to the gray connector.

    Wire Connection in UV Ballast

  6. Wiring the UV Tubelight

    Connect Pin 1 & 2 to one end of the Tubelight and Pin 3 & 4 to other end of the Tubelight.

    Soldering UV Tubelight Terminal

  7. Tubelight holder

    Use spare wires to make a holder for the UV Tubelight.

    UV Tubelight Pin Connection with Ballast

  8. UV Tubelight Mounting

    Mount the UV Tubelight to the internal surface of the box with at least 3 inches of gap from the aluminium surface.

    Mounting UV Tubelight inside UV Chamber

  9. Place the Rack

    Use a wire rack of at least 6 inch height to let the radiation reflect and touch the bottom surface of the materials placed on the rack.

    Wallet Inside UV Chamber for Disinfection

  10. Testing

    Never turn on the light when it is exposed towards any human or animals. Place a mobile inside the box in video recording mode. Switch on the light only once the box is perfectly coverd and no UV light can escape. If everything works a blue glow will be captured by the mobile camera.

    For disinfecting any object’s surface give an exposure of 2 – 3 Minutes.

Video

Step by Step Video Tutorial

Conclusion

UV-C is an very effective way to reduce the risk involved with handeling foreign goods like groceries, cash, mask etc. But safety need to be taken care of, to prevent any exposure to UV light.

As UV-C based disinfection is based on line of sight. It is recommended to use other methods like Soap or Ethanol based cleaning in combination with UV-C Disinfection method. This will help increase the safety to much higher extent.

Scope of Improvement

  • Multiple UV tubelights can be used to reduce the exposure time
  • Mechanical agitator can be used inside the box to turn the surface of the objects
Categories: DIY Project

Crazy Engineer

MAKER - ENGINEER - YOUTUBER

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