How to Choose the Right Ozone Generator?
The increasing demand for disinfection and hygiene products after the COVID-19 epidemic has led to a rapid increase in interest in ozone generators and ozone gas. We observe that many opportunistic companies, under the name of ozone generator manufacturer, victimize ozone gas, ozone generators and people, institutions or organizations dealing with ozone gas with incomplete information, wrong products and wrong practices, without knowing the nature of ozone gas. The question ‘How to Choose the Right Ozone Generator?’ became very important at this point. Below you can find information about the features that should be found in the ozone generator for the correct ozone generator selection.
-Important things to pay attention to when Buying an Ozone Generator (Ozone Machine)
When choosing an ozone generator (ozone machine), attention should be paid to the company’s quality documents, references, ozone gas information, product information, technical infrastructure, service network and project planning capability, as well as product quality and production capacity.
1) Ozone Generator Product Quality Certifications
The product you buy must have a CE certificate, but it is not sufficient. Even if the CE certificate is enough to sell ozone generators in Europe, it does not mean anything about the quality of the product. Since ozone generators are devices that produce ozone with electricity at high voltage and frequency, they must also have other certificates. These certificates;
- LVD (LOW VOLTAGE DIRECTIVE) or Electrical Safety Test Report: It indicates that the product zeroes the electrical risks that may harm human health and ensures the electrical safety of the product.
- EMC (ELECTROMAGNETIC COMPATIBILITY) or Electromagnetic Compatibility Directive: EMC is the ability to fulfil its functions in the electromagnetic environment in which a system or device is located without causing an irrecoverable disturbance in this environment.
- ROHS (Restriction of Hazardous Substances Directive) or Restriction of the Use of Certain Hazardous Substances: It is a test report showing that substances harmful to human health are not used in the product or the part-semi-finished product used in the production of the product.
- WEEE (Waste Electrical and Electronic Equipment Directive) or Electrical and Electronic Equipment Waste Directive: This directive aims to prevent electrical and electronic equipment waste. In addition to this, the reuse, recycling and recovery of such wastes reduce waste disposal. It is the implementation of the types.
2) Ozone Generator Capacity
Unfortunately, determining and labelling the capacity of the ozonation machine is a problematic issue and a bleeding wound in our industry. Since the capacities of ozone generators are not determined, inspected and certificated by no institution, many companies stick the desired capacity label on the products.
There are ozone generators in the UK that claim to produce ozone at a capacity of 10 grams-20 grams or even 50 grams/hour, which are sold especially on e-commerce sites. As consumers and end-users, it is your most natural right to ask the ozone generator manufacturers or sellers how the capacity of the product is determined and how they are tested. The right to obtain information about the product is one of the basic consumer rights and this right is protected by law.
With the gr / nm3 analyzer, each ozone generator is operated for 3 hours at 70-80% humidity and 30 OC values for 5 hours in an uninterrupted air conditioning cabinet and a concentration test is performed.
Under EUOTA / IOA standard directives, the ozone gas measurement device (gr / h) should be tested at 70-80% humidity for 3 hours and 30 OC for 3 hours without interruption.
Each device that complies with the +/- 1% capacity standard in these two measurement factors is sent to the shipment process after the final control approval. Capacity measurement cannot be done with air ozone measuring devices that measure the ozone amount in the environment in PPM. Air ozone measuring devices measure the amount of ozone gas in the volume, the production capacity of the ozone generator cannot be measured with this sensor or measuring devices.
3) Ozone Gas Output
Again, a problem arising from the ignorance of many companies that have just met with ozone gas and ozone generators is the inability to offer the appropriate device for the need. In many environment disinfection projects, devices with local outlets and without fan blowing are recommended for very large areas (100-150 m2). Unfortunately, due to this ignorance and misdirection, companies cannot utilize ozone gas as they wish.
Ozone gas is about 2 times heavier than air and if it is not distributed by an external factor (fan, compressor, etc.), it always tends to move downwards. In small areas (40-50 m2), the Ozonator machine without an air distribution mechanism and local output devices can be used by using natural air circulation in the environment. These types of ozone generators can’t be used in large areas or even in small areas for shocking purposes. In large spaces, you should choose ozone generators with a sufficient fan to deliver ozone gas to every corner of the space homogenously.
Portable ozone generators must have time control. It is not suitable to work with an ozone generator without time control even if it is used in non-human environments.
It should not be forgotten that if ozone generators are to be used in human environments, it should be automatically checked that the ozone gas in the environment does not exceed international limits, the ozone generator should automatically reduce its capacity and then stop it by communicating with the ozone measurement sensor.
Although the use of ozone is not preferred in human areas, it is MANDATORY to use ozone measuring devices or sensors in many EU countries in case of continuous application of ozone gas.
5) Control Against NO and Nitric Acid Production
As you know, there is not only oxygen in the air. Only 21% of the air contains oxygen. There is 78% nitrogen (nitrogen) in the air, which we refer to as ambient air. All ozone generators that produce ozone gas from the air create free O atoms by breaking down the oxygen, and this O (oxygen) atom combines with O2 in the air to form O3 gas. However, the oxygen molecules released by ozone generators do not only react with O2. Free oxygen atoms can react with nitrogen to form a NO-NO2 molecule. Due to this by-product, it is MANDATORY to have oxygen supply in ozone generators with an ozone production capacity of more than 8 grams/hour, as required by EU standards.
The main risk here is that the NO-NO2 molecule combines with moisture to form HNO3 (Nitric acid or as it is known among the common people). This effect does not show itself in a short time. We strongly recommend that you stop using the product immediately if you see a yellowish liquid or trace on the inside of the product or the case over time. Ozone generators should be designed not to produce NITRIC ACID even at 95% humidity conditions, and all necessary safety precautions must be taken against the occurrence of this reaction in our products.
6) Ozone Outlet Pressure (Corona Cell Operating Pressure):
The corona cell operating pressure is affected by the design of the ozone generator. Ozone generators can be built to work under vacuum, pressure, or both. The vacuum or pressure available will affect the ozone generator’s suitability for specific applications or change your system configurations.
Working under a vacuum is an excellent way to eliminate ozone leaks. If the ozone generator is running on dry air, it is possible to draw ozone gas from the ozone generator and air dryer while maintaining a vacuum and minimising moving parts of the system.
When an application necessitates the pressurisation of ozone gas, operating under pressure is ideal. The higher the pressure at which the ozone generator can operate, the more operational flexibility your system will have.
Increasing ozone pressure after the ozone generator is a poor choice because it generates excess heat, destroys ozone, and introduces new leak points.
Vacuum and pressure
Some ozone generators can work in a vacuum or under pressure. This works well when the feed gas is pressurised and a venturi injector creates a vacuum. Implementing an ozone generator with the ability to operate under vacuum or pressure results in an extremely simple to use and dependable system.
7) Energy Consumption
Another point that can be considered as an end-user here is the electricity consumption of the product. It is not possible to determine the electricity consumption and the ozone generator capacity, but it is possible to make a general inference. Including the latest technology and the most efficient ozone generators (in ozone generators with a capacity of over 1000 grams/hour), it needs 15-20 w / hour of electricity to produce 1 gram/hour of ozone gas from dry air. This ratio is valid for a system without an industrial type compressor or fan. Most portable products contain many electricity consuming materials such as fans and electronic cards.
Therefore, the minimum energy consumption of 200 watts is required to produce 10 grams/hour of ozone gas. No technology can produce 10 grams/hour of ozone gas with an energy consumption of 50-60-100 watts. You can request a report or written evidence of capacity measurements from companies making this claim.
The cost of the ozone generator is important to the overall system and should be considered in the proper context. Consider the following examples:
A more expensive ozone generator that produces more ozone and requires less feed-gas may reduce the cost of an oxygen concentrator and other equipment. Spending more on the ozone generator may lower the system’s capital and/or operating costs in the long run.
On the market, there are extremely low-cost imported ozone generators. These should be used with caution, but they may be useful in situations where long-term reliability is not critical, such as short-term pilot tests or lab testing.