UV Reactor

Hello to all scientists and science enthusiasts

Warning:

First of all, I must point out that this instruction and device contains electrical hazards and UV light, so you must be careful and use safety equipment.

Well, let's go to the construction of the device
In our laboratory, we needed to build a reactor that could test photocatalytic materials and, in addition, perform syntheses that needed UV light, such as polymerization. So I started making a set-up that included two lights with a wavelength of 240 nanometers and a power of 12 watts using a halogen lamp and 360 nanometers of 9 watts using LEDs. Unfortunately, I decided to write this instruction in the middle of making it, so in some stages, I did not have a good photo.

Supplies

The first step is to buy parts

1 Philips fluorescent lamp (230-250 nanometer wavelength, 12 watt)

2. Lamp frame (Suitable for your lamp)

3. transformer (Suitable for your lamp)

4 sockets

5 5V adapter for fan (I used a mobile charger)

6 fans 16mm for air movement

7 LED PCB

8 12* LEDs (3 watt 360 nm)

9 power supply(12 volt 3 amp)

10 wire terminals

11 triple rocker keys

12 large rocker keys

13 fuse boxes

14 fuses 5 amps

15 tin, oil, wire

16 Resistance

17 Fan and heatsink (I used the CPU fan)

18 some wood plates

19 Bolts

20 Silicone paste

21 wall plug

22 3 pin plug and cable

Make the Box

Well you need a box. The dimensions of this box should be considered according to your equipment. Well you need a box. The dimensions of this box should be considered according to your equipment. In this project, a box of 80 x 60 x 60 cm was made. MDF boards with a thickness of 1.6 cm were used for the body and 3 mm sheet for the back of the box. The front panel is used as a door so it needs two hinges

Make LED Circuit

Since it is easy to connect a fluorescent lamp, we first go to make LEDs.

Well, due to the purchased PCB completely puts the LEDs together in series, in order to take advantage of the power of all the LEDs, we have to make some improvements on the board. you can see the diagram of circuit in pics. I turned the board into 4 triple series and connected these series in parallel, and first I put a resistor in each series to control the voltage and current to prevent damage to the LEDs.

To calculate the resistance, we use the following formula

V=IR

R=V/I

for each Serie (We will use a 12 volt power supply so we have to subtract the amount of voltage consumed by the series from 12)

R=(12 - 3.3+3.3+3.3)/0.7 ==> R=3 so I use 3.3 ohm resistor for each series due to the high amperage in circuit we should use 2 watt resistor at least

Note that the special PCB for LEDs is made of aluminum to prevent the LEDs from heating up. This cooling property also makes the soldering process difficult. It is better to use a heater to warm up the PCB, but the heat should be such that it does not separate the copper strips. Before soldering, make sure that you use silicone paste between the LED floor and the PCB aluminum part.

Then the heatsink and CPU fan placed behind the PCB and silicone paste used between them. Connect the yellow and black wires to the positive and negative wires of the board, respectively.

4 holes were made in the heatsink to connect the set to the box.