How to Correct Flow Reading for Pressure
A standard rotometer style flow-meter using a floating ball is commonly used on oxygen concentrators and ozone generators to measure gas flow-rates. This standard flow-meter may be used in a wide variety of applications and are therefore calibrated to read gas flow accurately at ambient temperatures and pressures of the gas passing through the flow-meter.
An accurate flow measurement is essential to diagnose low oxygen purity from oxygen concentrators, prevent damage to oxygen concentrators, and get accurate calculations of ozone production from an ozone generator.
When the gas, either air or oxygen, passing through the flow-meter is pressurized the flow-meter will read that flow inaccurately.
How to Correct Flow Reading for Pressure:
A standard rotometer style flow-meter using a floating ball is commonly used on oxygen concentrators and ozone generators to measure gas flow-rates. This standard flow-meter may be used in a wide variety of applications and are therefore calibrated to read gas flow accurately at ambient temperatures and pressures of the gas passing through the flow-meter.
An accurate flow measurement is essential to diagnose low oxygen purity from oxygen concentrators,
prevent damage to oxygen concentrators, and get accurate calculations of ozone production from an ozone generator.
When the gas, either air or oxygen, passing through the flow-meter is pressurized the flow-meter will read that flow inaccurately. The picture below shows two identical flowmeters side by side with the same amount of oxygen gas flowing through each flowmeter from an oxygen concentrator. The flowmeter on the left side is under 20 psi of pressure, while the flowmeter on the right is under 0 psi of pressure. Even though the amount of oxygen flowing through the flow-meters is identical, the flow readings are different. Under pressure, the flowmeter will read lower than the actual flow.