When it comes to Non-Medical oxygen usage, the Pro-5 Oxygen Concentrator comes second to none. 30 years of success in the oxygen industry has now produced the Pro-5 Series. The proven design and years of technological advancements have now brought one of the best oxygen concentrators on the market. The reimagined and sleek device proves that not only does extremely high quality oxygen production have to take up space, but it also does not have to break the bank. Along with the good looks, this product’s wheels, carry handle, and light-weight (only 35 lbs) make it an incredibly portable device as well. Even with it’s light weight, the tough thermoplastic covering also makes it a very durable product. The Pro-5 also comes with a safety alarm to offer an enhanced peace-of-mind while it is being used. All-in-all, this low maintenance oxygen concentrator is great for a multitude of applications.
The OZX-300 Air Dryer is a filter that comes included with your ozone generator. The ozone generator will begin to perform less efficiently as the dust and humidity in your air supply grows. The Air Dryer ensures that your ozone generator is being fed the cleanest air possible. The Air Dryer is a plastic tube that contains small silica beads on the inside, the silica beads then remove a majority of the moisture from the air that goes through it.
The Air Dryer is critical for making sure your ozone generator is working at its peak capabilities, and it is also included when you order an OZX-300 Ozone Generator. After being used, the beads within the air dryer will turn from a red color, into more of a dark greenish color. Once the bead color has transition, simply put them in a microwave or oven to adjust them, as heat will bring the beads back to their original red. (Note: Do not heat the container as a whole, the extended/extreme heat exposure will cause cracking. The beads can be reheated approximately 4-5 times before they will need to be replaced. For replacing beads, please contact Oxidation Technologies. For more information, please look here.)
OZX-300 Ozone Generator
While Oxidation Technologies offers a wide array of industrial-sized ozone generators (OXP, OXG, and OXW) we also offer the OZX-300 Ozone Generator to be used for smaller applications. The OZX-300 allows for smaller objects to be ozonated, without worry of breaking the bank. This ozone generator produces 500 mg/hr of ozone and offers an output dial as well as an adjustable timer to help enhance usability.
This product is shipped with an integrated air pump, ozone tubing, diffusers and an air dryer. All of this means that when the product arrives at your door, it will come ready to produce ozonated water. The OZX-300 Ozone Generator is also great for other applications such as removing bacteria and infectants from fruits & vegetables as well as extending shelf-life expectancy for fresh produce, and even removing odors.
500 mg/hr ozone output (concentration of 4.2 g/m3 [.33%] at 2 LPM flow rate
Integrated air pump + ozone tubing + diffusers
2 LPM air flow rate with integrated air pump
Adjustable ozone output
3/4 PSI air pump pressure (approx. 1.5 feet of water depth)
Ozone gas can be dissolved into liquid with simple bubble diffusers, similar to what is commonly used in the bottom of a fish aquarium for aeration. This is a simple and cost-effective method to dissolve ozone gas into liquid. As ozone is partially soluble into liquid the ozone gas will transfer into liquid immediately at the interface between the ozone gas bubble surface and the surrounding water.
Diffusers implement a gas permeable membrane that will disperse the gas stream into many smaller ozone gas bubbles in the water. As these ozone gas bubbles naturally rise to the surface of the water that ozone will transfer into the water due to contact between the liquid and gas bubble.
Easy to setup
Low energy – does not require water pumps or elevated water pressures
Simple, reliable operation long-term
Generally the least efficient method of dissolving ozone into liquid
Diffusers can become plugged and may require periodic replacement
Difficult to use in pressurized water flows
Ozone gas is partially soluble into liquid. However, using proper methods and equipment high mass transfer efficiencies can be realized with any method of dissolving ozone into water. Review the tips below for success using an ozone gas bubble diffuser in your ozone application.
Fundamentals of ozone solubility:
Lower temperatures increase the solubility rate of ozone gas into liquid
Higher pressures increase the solubility rate of ozone gas into liquid
Higher ozone gas concentrations increase the solubility rate of ozone gas into liquid
Design considerations for your bubble diffuser and column:
Diffuser micron ratings – smaller is better!
Ozone gas bubble diffusers will be rated in micron size, or resulting bubble size the diffuser will create. The membrane that splits the gas stream into small bubbles will have pore sizes, smaller pores will result in smaller bubbles. This pore size or bubble size is normally referred to in a micron rating.
Micron = micrometer. Equal to 0.001 millimeter, or about 0.000039 inch
Smaller bubbles create more surface area of the gas the ozone is flowing in. Greater surface area will increase the ability of ozone gas to transfer into the liquid. See the example below:
The image above shows the same gas volume (1 ft3) shown in one bubble, 8 identical bubbles, and 512 (8 tall x 8 wide x 8 deep) identical bubbles.
One 1 cubic foot sphere = 4.8 ft2 surface area
Eight 0.125 cubic foot spheres = 1 cubic foot = 1.2 ft2 each = 9.66 ft2 total surface area
Eighty 0.0125 cubic foot spheres = 1 cubic foot = 0.26 ft2 each = 20.8 ft2 total surface area
512 0.001953 cubic foot spheres = 1 cubic foot = 0.07567 each = 38.7 ft2 total surface area
A bubble size ¼ the size (4.8 / 4 = 1.2) results in 8x more bubbles and double the overall surface area.
Relating this to your ozone gas flow. A 25 micron diffeser will create bubble sizes ¼ the size of a diffuser rated for 100 micron therefore creating more than 2x the surface area of gas contacting the water at the same flow-rate of gas flowing into water.
Smaller really is better!
Tank design – skinny is better!
Gas bubbles will naturally rise to the surface of water due to buoyancy. Therefore, the taller your tank, column or ozone tank is the longer your gas bubble will remain in the water increasing the opportunity for the gas to transfer into the liquid.
Taller tanks will also increase the water
pressure at the bottom of the tank where the ozone gas diffuser will likely be placed. Greater water pressure will increase the natural solubility of ozone gas into liquid. For example:
11.33 feet of water = 5 PSI
5 PSI = 34% increase in ozone solubility vs 0 PSI
Increasing your water column by 11.33 feet will increase your solubility of ozone, or your mas potential ppm of ozone in water by 34%.
1 ppm becomes 1.34 ppm with no other changes.
A great example of separate columns is shown in the image and dimensions below. Both columns are 3 liters in volume, with a change in diameter from 2” to 4” the height is increased from 12” to 58”
If you have the opportunity when desiring your tank or reactor, choose the smallest diameter possible.
Skinny really is better!
Counter Current Flow
Ozone contacting basins can be designed with counter-current flow, where the water flows counter-current to the gas bubbles. While gas bubbles will naturally rise to the surface of the liquid due to buoyancy liquid can be forced into the path of the gas bubble to create additional turbulence. The diagram below shows a simple contactor basin design using baffles to create counter-current and con-current flows of ozone gas to liquid
This same technique can be applied to any column in flowing water using piping water flowing down a column that ozone gas is rising within. Consider this simple technique when designing your tank or piping system
Ozone dosage =the amount of ozone applied to the water
Dissolved ozone =the amount of ozone measured in the water
Ozone dosage into water does not equal dissolved ozone in water. Ozone is generated as gas and must be dissolved into water in many applications. As ozone is only partially soluble in water mechanical mixing equipment is necessary to dissolve ozone into water efficiently. There are no systems that will achieve 100% mass transfer of ozone gas into water, therefore the dissolved ozone levels will always be lower than the applied ozone, or ozone dosage rate.
Final measured dissolved ozone levels in water will be affected by water quality contamination, water temperature, and the efficiency of your mechanical mixing equipment used to dissolve ozone into water.
To achieve a specific, targeted dissolved ozone level the oxidizable compounds in the water must be overcome along with any other ozone scavenging conditions, also keep in mind the ozone half-life may come into play depending upon the duration of time used to achieve your target dissolved ozone level.
The quantity of ozone you attempt to put into the water will always exceed the amount of ozone actually absorbed into the solution.
Due to the low solubility rate of ozone gas into a liquid and due to system inefficiencies, a portion of the ozone off-gases without being absorbed into the water. This off-gassed ozone must then be vented outside or destroyed with an ozone destruct unit.
The ratio of ozone gas dosage to the final dissolved level is commonly referred to as the mass transfer rate. This refers to the amount of ozone gas that was measured as dissolved vs the ozone dosage rate. This is commonly referred to as a percentage. Such as a 90% mass transfer rate of ozone would indicate that 90% of the ozone dosage, 1ppm for example, would result in 0.9 ppm of ozone measured in water.
Different methods of ozone injection will achieve different dissolved ozone levels into water due to different efficiencies and mass transfer of ozone into water. A few examples of these options are shown in the images below:
“References: Bader H. and J. Hoigné, “Determination of Ozone in Water by the Indigo Method,” Water Research Vol. 15, pp. 449-456, 1981. APHA Standard Methods, 23rd ed., Method 4500-03 B-1997.
With the indigo method, indigo trisulfonate dye immediately reacts with ozone. The color of the blue dye decreases in intensity in proportion to the amount of ozone present in the sample. The test reagent is formulated with malonic acid to prevent interference from up to at least 10 ppm chlorine. Results are expressed as ppm (mg/L) O3.The CHEMetrics Indigo Ozone Vacu-vials® Kit employs an innovative “self-zeroing” feature to eliminate the need to generate a reagent blank. Each Vacu-vials® ampoule is measured before and after being snapped in sample. The change in color intensity, measured in absorbance, between reagent in the unsnapped and snapped ampoule is used to determine the ozone concentration of the sample.”
The indigo test kit can be purchased at the Oxidation Technologies web store. Indigo test kit.
The I-2022 Dissolved Ozone Meter is designed for accurately and quickly measuring ozone in water levels from 0 – 0.75 ppm. This device uses the Indigo Method for testing. This method is based on the colorization of dye by ozone, where the loss of color is directly proportional to the ozone concentration. The results are then displayed on the monitor in ppm (mg/L) of ozone present.
This device has LED display for precise and accurate readout and is easy to use. Once the I-2022 has been purchased the cost per test is only $1.02.
Next, use the dilute method to measure higher concentrations of ozone.
The Indigo snap method test kits will measure up to 0.75 so a dilute procedure can be used to derive an accurate measurement. The video uses the K-7404 kit which used the DPT method, but the principle can be applied to the Indigo kit as well.
Feel free to contact Oxidation Technolgies with any ozone questions.
We have recently started selling the MAX-Series of oxygen concentrators. This is a great addition to our oxygen concentrator line-up. We believe these units are a higher build-quality, at a lower cost, than the other units we have been selling, and have faster lead-times.
The MAX-Series oxygen concentrators are available in three sizes:
The Chemetrics I-2019 Dissolved Ozone Meter is a handheld, battery operated device with an LCD screen readout of dissolved ozone levels. The items needed for taking a test of the levels of ozone dissolved in water include: the I-2019 meter, a zeroing cylinder, a new testing ampoule, a light cover, a test cup, activator solution, and, of course, the sample of dissolved ozone.
Always remember that the steps for taking the test must be done quickly to avoid O3 breakdown before the test is completed. Ozone reverts quickly back to oxygen (O2), and if too much time passes from when you add the dissolved ozone to the test cup to when you take the reading, the reading will be lower than what the true ozone level is in your application.
These are the steps: 1. Turn on the I-2019 meter by pressing the ON/OFF button. The O3 symbol will appear on the screen. 2. Place the zeroing ampoule in the meter’s sample port. 3. Place the light shield over the zeroing ampoule. 4. Press ZERO/TEST button. The O3 symbol will flash for 8 seconds, after which the screen readout will read 0.0.0. 5. Remove the zeroing ampoule and set that aside. Keep the light shield for the next steps. 6. Fill the test cup to the 25 mL line with dissolved ozone. 7. Add 5 drops of activator solution to the test cup. 8. Place tip of new testing ampoule in sample cup and snap off tip against the bottom of the test cup. The vial is vacuum sealed and will fill instantly with the sample. 9. Dry the vial, place it in meter’s test port, and cover with the light shield. 10. Wait 1 minute for the test to develop. 11. Press ZERO/TEST button. The O3 symbol will flash for 3 seconds, and then the reading of the dissolved ozone level will appear on the meter’s screen.
The D16 PortaSens III Handheld Monitor with the Ozone Sensor part number 00-1009 can have the detecting range set by the user at any range from 0-5 ppm ozone up to 0-200 ppm ozone. The resolution is 0.1 ppm ozone at any range from 0-5 ppm up to 0-49.9 ppm ozone. The resolution of the readout on the screen is 1 ppm ozone when set at the range of 0-50 ppm up to 0-200 ppm. The standard range for this sensor is 0-20 ppm ozone, which has a resolution of 0.1 ppm.
The EcoSensors OS-6 Ozone Monitor has a safety control relay built in that is set to activate above the ozone human safety limit of 0.1 ppm. When this relay is wired to the Remote Alarm Panel (RAP-1), a loud audible alarm and flashing light will activate when ozone levels go above 0.1 ppm. This blog explains how to wire the RAP-1 to the safety control relay on the OS-6 Ozone Monitor.
Step 1: Remove the front panel on the OS-6. Step 2: Insert tip of RAP-1 free cable through one of the nipples on the bottom of the OS-6 monitor. Step 3: Locate the control relay labeled “ABOVE 0.1 PPM.” Connect the red wire to the Normally Open (N/O) terminal and the black wire to the Common (COM) terminal. Step 4: Replace the OS-6 front panel.
The OS-6 is now wired to the RAP-1. When mounted on a wall and powered on, an audible and visual alarm will now activate when the ozone levels are above the human safety limit of 0.1 ppm.