How to Check the Oxygen Purity of Your Oxygen Concentrator

The purity of the oxygen coming from your oxygen concentrator is extremely important. You're counting on it to maintain a certain level of purity at a certain setting, to receive the amount of oxygen your need to stay healthy. This specific amount of oxygen was determined by your doctor, and prescribed to you, to make up for the amount of oxygen your lungs can't breathe in.

You can always check the purity to make sure you are getting the amount of oxygen you need. There are also ways to maintain and take care of your oxygen concentrator, to make sure it will continue to deliver this purity level for many years to come. If you ever start to feel worse and you know your COPD or other chronic lung disease hasn't exacerbated (flared up), it might be that your oxygen concentrators oxygen purity has gone down. This is definitely when you would want to put it to the test.

The reasons an oxygen concentrator might be filtering oxygen at a lower purity level, is because it's an older model that hasn't been properly refurbished and it's not working as well, there is a malfunction, or one of the filters hasn't been cleaned when necessary.

Check your owners manual to see if your oxygen unit has a gross particle filter. This is the filter that should be cleaned regularly, and replaced periodically. Follow the directions in your owners manual for how to remove, clean and replace the gross particle filter. If this filter isn't cleaned often enough, it can bring down the amount of pure oxygen that is brought into the oxygen concentrator. The ambient air has to first pass through the gross particle filter, to be cleaned of debris and dust in the air.

The inner filter and components might also need maintenance, and that's when you should send your oxygen concentrator back in for maintenance. You won't be able to clean the inner filters or components yourself, and you will need to send it to the manufacturer, or to the store where you bought it from.

Educate yourself with our Free Oxygen Therapy Guide

If you have a new oxygen concentrator and you are keeping up with any filter cleaning that you can do yourself, you should only have to get the oxygen purity checked once a year. Visit your doctor, who will check the purity with a device called an Oxygen Purity Analyzer. He or she can attach it to the oxygen outlet nozzle, and it will read the oxygen purity in percents.

Oxygen purity analyzers are expensive, the more affordable start at a few hundred dollars. You should go to your oxygen provider to get your new concentrator tested once a year, or every 6 months if you have a used model.

About Scott Ridl: Scott joined American Medical Sales and Rentals in 2008 as a Web Manager and Content Writer. He is a writer and designer. He is extensively trained on oxygen therapy products from leading manufacturers such as Inogen, Respironics, Chart, Invacare, ResMed and more. Scott works closely with respiratory therapists and oxygen specialists to educate the community about oxygen therapy products, COPD, asthma and lung diseases. He writes weekly columns and is passionate about educating the community on oxygen therapy and respiratory issues.

11 thoughts on “How to Check the Oxygen Purity of Your Oxygen Concentrator”

  • L.W Oliver

    need a divice to check oxygen purity

    • Danielle Jason
      Danielle Jason June 19, 2017 at 1:07 am

      Thank you for your comment Oliver. Unfortunately, we do not sell oxygen purity assessment devices.


    how to check oxygen purity meter, in the mfg of idustrial oxygen.
    please give reply fast as soon as possible.

    • Danielle Jason

      Thank you for your comment. Unfortunately, we do not work with industrial oxygen in the manufacturing industry. We solely work with medical grade oxygen used in oxygen concentrators.

  • Firas

    I change the zeolite and its new but the purity still around 44% i cheeked all points and filter and I'm sure about the new zeolite
    could you help to know what is the problem ?
    Thanks in advance

  • Ann

    What do you do and how would you know if your oxygen concentrator is delivering the amount of oxygen it is set for.? We had an incident yesterday with two concentrators that were not working correctly. It would appear strong and Bubble at the humidifier on five plus liters. However very little air was coming through to the nasal cannula and patience oxygen saturations were dropping. Changed out the tubing twice to a shorter tubing to no avail. Hospice nurse said it was just saying xiety until she came and realized it was true and had the machine switched out. Meanwhile put him on a tank. She had no idea how to check to see if a concentrator was working correctly. I want to know how you can tell if it's working correctly or how to troubleshoot it. Do you know?

    • Danielle Jason

      Thank you for your comment, Ann. Are you familiar with a Pulse Oximeter? A pulse oximeter is a small and lightweight device that attaches to a fingertip to painlessly measure the level of oxygen in your body. The oximeter is a great way to asses current levels, health, and be able to tell if that patient is receiving the saturation they require. Feel free to read more here: If you purchased your machines through us, and are under warranty, feel free to reach out to our Service Department at 877-303-9289 if you have concerns regarding the functioning of your machines.

    • Ron

      Ann , make sure the humidifier bottle cap is screwed on tight and Not cross threaded , this will cause bubbles to appear in the bottle but allow oxygen to escape from the cap at the same time . this has happened to me before .

      • Chet

        It is almost always the humidifier make sure everything is tight no crossthread no cracks eliminate all tubing humidifier and don't turn machine above 5 liters, hook cannula directly to concentrator if needed .if you need a true 5 liters consider a concentrator that goes to 10 liters and set it a little above 5 measure with a liter flow tester


Leave a Comment