UV Based Disinfection Devices

AUTOMATED LUGGAGE DISINFECTOR USING UV-BATH

• A kiosk using UV bath is developed, which can disinfect the baggage or other objects being carried inside. This system can be used for sanitization of luggage entering the campus of industrial establishments / defence units etc. The same system is planned to be used for disinfection of items being carried onto naval ships and submarines.
• The system consists of a roller based conveyor carriage moving inside a chamber which is configured with UV bath of calibrated dosage. 
• The type of UV used for the purpose is Far-UVC, which according to literature is effective against Corona virus. 
• The items to be disinfected are carried on the conveyor to the chamber such that there is scanning and sanitization of the item all around the object surface. 
• For maintaining the required exposure of the item to the UV rays on all areas as per required intensity and time for the sanitization process, the movement of the conveyor is automated, along with necessary electrical and mechanical safety interlocks 
• Although Far-UVC is claimed to be harmless to human beings, sufficient precautionary measures are introduced to prevent leakage of UV beyond the chamber.

DEFENCE RESEARCH ULTRAVIOLET SANITIZER (DRUVS)

• A UV-C Sanitizer cabinet called DRUVS (Defence Research Ultraviolet Sanitizer) is developed for sanitizing objects without using chemicals.
• It has Fail safe design in which UV cannot be switched on if cabinet drawer is in open condition.
• Touch free automatic operation
• Total Irradiation: 9000 µWatt/cm2 (Calculated value)
• Gives 360 Degree Exposure
• It is Ozone Free

NOTESCLEAN

• An Automated UVC Currency Sanitizing Device called NOTESCLEAN is developed. 
• In this sanitizing technique one has to just place the loose currency notes at the input slot of the device. It picks the notes one by one and makes them pass through a series of UVC lamps for complete disinfection.

PAPER DISINFECTOR

• To meet the imminent need to disinfect daily paper-based items entering an establishment, a product called Paper Disinfector is developed .
• Paper / envelopes up to A4 size can be disinfected using the device
• The device consists of two foldable halves - an upper lid and a lower lid 
• To disinfect various paper-based items entering the establishment at the security office or the central registry, like entry passes, DAK, tender documents, currency notes etc., the operating person lifts the upper lid and asks the incoming visitor to place the item on the lower lid. He then closes the upper lid. The paper-based item is heated in between the two lids. 
• Heating is done by means of Nichrome wire of selected resistivity which is placed inside a glass wool / mica sleeve, and sandwiched on a conductive cloth, and further wrapped in velvet for retention of heat. Two such sets of heating pads are used, one fixed on the bottom of the upper lid and the other on the top surface of the lower lid. 
• The system draws electrical power of approximately 120 Watts, and has controls including ON/OFF switch & Indicators, fuse and timer control. There are different operation modes for the type of item like paper, currency, envelope etc. depending on the settings for temperature and exposure time. 

PORTABLE UVC KILLER

• Portable Ultra Violet C-band (UVC) Virus Killer system is developed by LASTEC, Delhi to disinfect various objects by inactivating bacteria and viruses 99.9999%.
• The device uses UVC Lamp of 254nm wavelength as excitation Source. Irradiance of 0.5mW/cm² is created over the object for 2 Minutes delivering a UVC dose of maximum 60 mJ/ cm² (required 40 mJ/ cm² to achieve 99.9999% inactivation).
• The system is very compact having Dimensions 48 cm x 38 cm x 23 cm and Weight of 6 Kg only. It can sanitize Office Files, Letters/Envelops, Laptop etc.
• As a safety feature UV light turns OFF once top cover is open. The user can do monitoring through acrylic window provided on side.

UV BASED DISINFECTION DEVICES

• UltraViolet-C (UV-C) light consists of a shorter but energetic wavelength of light. It is particularly good at destroying genetic material in COVID-19. The radiation warps the structure RNA which prevents the viral particles from making more copies of themselves.  UV-C kills microbes quickly. Sanitization of the items by employing UV-C light avoids the harmful effects of the chemicals used for the disinfection. 
• Objects like N-95 Masks, Mobile phones, iPad, Laptop, Currency Notes, Check leafs, challans, Passbooks, Paper, envelopes and many more items can be sanitized using UVC box.
• Thermal heating in another way to disinfect papers, which is an essentiality for office works
• These are environment friendly and contact free effective sanitization methods.

UV BLASTER – AREA UV DISINFECTION SYSTEM

• A UV Disinfection Tower called as “UV Blaster” is developed.
• The equipment may be used for rapid and chemical free disinfection of office spaces and buildings. As stated earlier, UV treatment is proven to reduce air and surface contamination up to 99.99%.
• Based on the studies of the UV dose on COVID-19 is not available. However, from the studies of effect of UV-C radiation on other Corona family of viruses like SARS & MERS, the UV-C dose for 99.9% disinfection of COVID-19 is deducted as 30 mJ/cm2. 
• It is remotely operated through laptop/mobile phone using wi-fi link
• UV-C Power: 
• 6 lamps each with 43 Watts of UV-C power at 254 nm wavelength arranged for 360 deg. Illumination.
• UV intensity at 2 m distance = 0.4 mW/cm2.
• Disinfection Time: 
• ~10 minutes for a room of ~ 12 ft x 12 ft dimension. 
• ~30 minutes for 400 ft2 (by positioning equipment at different locations within the room).
• Safety Feature: 
• Automatic switch off on accidental opening of room/human intervention.
• Key to arm operation.
• It costs around Rs. 1.5 Lakh per unit for an order quantity of two units, The cost may come down to less than Rs. 80,000/- for reasonable numbers. 

UV-C BASED VIRUS FALCON FOR HVAC

• DRDO has designed & developed a ‘Virus Falcon’ to deactivate Virus and Bacteria in the Heating Ventilation & Air conditioning (HVAC) system. It uses Ultra Violet C-band (UVC) light and Super Oxide Ions to reduce Biological Counts in HVAC system of a Centralized Air conditioning building. 
• The system has been designed to deactivate virus and Bacteria at Filter unit, cooling coil unit and Plenum unit of the HVAC system as shown in picture. 
• UVC light and Super Oxide Ions are generated using a UVC Lamp Excitation Source (254nm) providing Intensity of 13.4 mJ/cm². The system Air Handling Unit (AHU) can handle Flow Rate of 14000-17000 cubic feet per minute which is suitable to sanitize air in flowing ducts of Centralized Air Conditioned Building.
• The system has been tested by taking air samples before and after switching ON the AHU by using Andersen sampler. Biological Counts (Bacterial and fungal Count) in AHU were measured using Petri Plate Exposure Method at NABL accredited lab and total Bacterial and Fungal counts reduction achieved were 94% and 91%. 
• The system has been jointly developed with Industry and know–how is transferred for mass production to identified partner (s).

UVC BASED SANITIZATION ENCLOSURE

• An enclosure having rotating platform is developed by LASTEC, Delhi, to provide uniform UV exposure and sanitization of packets, bags, briefcases, purses, medical accessories, etc.
• The system uses UVC radiation (254nm) and delivers total output power of 180 Watt through 6 tubes so fitted to give full coverage on the item. UVC Reflective walls further enhance the irradiance. Virus can be inactivated within less than 3 minute (99.99%). Timer Knob is provided for variable sanitization time (pre-setting).
• The system has auto switch-off feature of UVC lamp while door is open. Further front acrylic window has been provided for see-through vision.
• The enclosure has dimensions of 1650(H)X676(D)X763(W) mm and provides total sanitization area of 0.809 m2.
• The product has been made commercially available through Industry.

UVC LED BASED HANDHELD RECHARGEABLE SANITIZATION DEVICE

• UV ‘C’ light with 270 nm wavelength is useful for sanitization of any exposed surfaces and items of daily use. Previously device were developed which consists of a UV tube operated on the main supply. So availability of power was essential requirement for such devices.
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• A hand held UV ‘C’ LED based, rechargeable sanitization device has been developed which can be used anywhere and can be carried even in the briefcase.
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• The systems consist of UV‘C’ LED fitted in a Metal Shielded body. A small lithium ion battery along with the charge controller unit has been fitted inside the body .A small charger has been provided to charge the battery.
• Two types of systems have been fabricated. One version with 8 UV LED has peak wavelength of 275nm and 15mW radiant flux. The second one, consisting of 6 UV LED having 19 mW radiant flux, is comparatively smaller so has been called mini system.

UV SANITIZATION BOX AND HAND-HELD UV DEVICE

• DRDO has designed & developed Ultraviolet C Light based sanitization box and hand held UV-C (ultraviolet light with wavelength 254 nanometres) device.
• The UV-C box is designed for disinfecting personal belongings like mobile phone, tablets, purse, currency, cover of office files, etc. COVID-19 virus gets deactivated by using UVC lamps in one minute. The box is designed to deliver 100mJ/cm2 UV-C dose equidistantly.
• The UV lamps used in the sanitization box also emits 185 nm which produces ozone and is able to take care of the unexposed area on the surfaces of the objects placed in the box
• The hand held device having eight watt UV-C lamp disinfects office and house hold objects like chairs, files, items delivered by post and food packets with an exposure of 45 second at a 100 mJ/cm2 irradiance placed at a distance of less than two inches. This measure can reduce the transmission of Coronavirus in office and public environment which is required to be operational in all conditions.

UV SANITIZATION BOX – VERTICAL (FOR MASKS)

• UV-C Sanitization Vertical Box is developed for specific purpose of sanitizing the masks.
• The system is automatic and as the door is opened UV-C light is switched off.
• This will enable disinfection of masks and enable the re-use