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OZONE UNITS OF MEASURE

ppm = Parts per Million

Is a measurement of concentration. PPM (Parts per Million) would indicate how many parts of the gas in are in every 1 million parts of total gas. For example; if we state there is 1 ppm ozone, that means for every 1 million parts of gas, 1 of these is ozone. The tricky thing with ppm is that we can be measuring the parts by volume, or weight. Sometimes you may see this as ppmv, indicating parts per million by volume. The most common ozone measurement is ppm, and is used to measure ozone in air and ozone dissolved into water.

ppb = Parts per Billion

This indicates the same thing as ppm, only change the million to a billion. This moves a decimal point 3 places. For example 0.1 ppm = 100 ppb.

mg/l = Milligrams of ozone per Liter

Is a measurement of concentration. This indicates how many milligrams of ozone there are in one liter of total volume. Mg/l can be used to indicate the concentration of ozone in gas or liquid.

1 mg/l of ozone = 1 ppm of ozone in water. Due to the density of air this is no longer true and 1 ppm of ozone = 2140 mg/l. This is a common term used to measure the amount of ozone dissolved into water.

ug/ml = Microgram per milliliter

Is a measurement of concentration. This indicates how many micrograms of ozone there are in one milliliter of total volume. Ug/ml can be used to indicate the concentration of ozone in gas or liquid.

1 ug/ml = 1 mg/l - these terms are equal, no conversion is necessary

g/m3 = Grams of ozone per Cubic Meter

Is a measurement of concentration. This indicates how many grams of ozone there are in one cubic meter of total volume. This can indicate volume of a gas or liquid. g/m3 is most commonly used to measure the concentration of ozone in a gas stream.

1 g/m3 = 1 mg/l = 1 ppm of ozone in water

1 g/m3 = 467 ppm of ozone in air

% by weight (Percent by weight)

Is a measurement of concentration. This indicates the percentage (%) of ozone within a given gas stream. This is a very common method to illustrate the concentration of ozone from an Ozone Generator. This is more complicated than g/m3 as the weight of gas changes if it is air, or oxygen gas that the ozone gas is mixed with.

1% Ozone = 12.8 g/m3 Ozone in air

1% Ozone = 14.3 g/m3 Ozone in oxygen

g/hr (gm/hr) = grams of ozone per hour

Is a measurement of ozone production. This is the most common method of measuring the output of an Ozone Generator. We can measure the concentration of ozone in g/m3, then when we calculate for flow rate with a measurement such as LPM (liters per minute), we can determine how many grams of ozone are produced in one hour of time.

mg/hr = milligrams of ozone per hour

This indicates the same thing as g/hr only on a smaller scale. Smaller Ozone Generators may be rated in mg/hr.

1 g/hr of ozone = 1,000 mg/hr of ozone production