The rate of ozone output is usually measured in lb/day or g/hr.
In order to calculate the ozone output value, a mass over time value is used. This indicates the mass of ozone produced in a specified period. Although ozone concentration decreases as feed gas flow rates through the ozone generator increase, it does not increase as fast as feed gas flow rates. In most ozone generators, this is a trade-off across all flow ranges of ozone feed-gas.
In this article, all calculations are in g/hr.
To determine the grams of ozone produced by an ozone generator in an hour, we must determine how many grams of ozone are produced per hour. This can be determined by measuring the gas flowrate through the ozone generator as well as the concentration of ozone in the gas.
Ozone concentration is typically measured in percent by weight or g/m3.
Equipment Needed to Calculate Ozone Output
· Supply-gas flow-meter
· UV Ozone Analyzer
· Ozone destruct device
· Ozone gas flow meter
High concentrations of ozone require an UV Ozone Analyzer to be measured accurately. A UV-based ozone analyzer can be used to measure the high concentrations of ozone produced by industrial ozone generators. It can measure ozone in g/m3 or % by weight. Using this information, you can determine the amount of ozone gas produced by the ozone generator.
Ozone generator supply-gas flow meters measure the total amount of oxygen or dry air that is flowing through the machine. This will be used to determine the total ozone production by measuring the volume of gas and providing the total mass of gas.
Using the Ozone Gas flow-meter, the ozone analyzer can be controlled according to how much ozone gas flows through it. The majority of UV based ozone analyzers are rated for gas flow rates of 1-2 LPM. Consequently, ozone gas flow must be diverted around the ozone analyzer when the total gas flow is greater than 2 LPM. By using this ozone gas flow-meter, the ozone analyzer will be able to control and regulate its gas flow.
Moving forward, the Ozone Destruct Device will be utilized to safely restore oxygen to the air after the ozone analyzer. It will allow ozone measurements to take place in a safe environment.
Measurement of Ozone Generator Output with an Ozone Analyzer
As shown in the illustration below, this equipment can be configured in various ways. In a permanent installation where validating ozone production is imperative, this may be a temporary setup for testing an ozone generator.
Units of Measure
- g/m3 = the method is commonly used to evaluate ozone concentration by weight.
- g/hr = this is the best method to measure ozone production.
- wt% = best method to measure ozone concentration by weight.
- lb/day = this unit is used to measure very large ozone generators.
Concentrations of ozone may be reported in percent or grams per cubic meter, depending on your ozone analyzer. Below are examples of calculations for each. The flow is only measured in LPM for convenience.
% by weight using oxygen as feed gas
Ozone Output (g/hr) =(( LPM x 0.001) x 60) x(14.3 x % by weight)
Ozone Output (g/hr) = ((LPM x 60) x 0.001) x g/m3
% by weight using dry air as feed gas
Ozone Output (g/hr) =(( LPM x 0.001) x 60) x(12.8 x % by weight)
g/hr – lb/day
1 lb/day ozone = 18.89 g/hr ozone
It is important to note that using wt% to measure ozone concentrations results in different results between air and oxygen gas because the gas’ density is different. To check an Ozone Generator’s output (as shown above), separate conversion calculations must be carried out. Since ozone concentrations and ozone production are commonly measured in g/m3, we prefer to use that unit.
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