What is an Oxygen Concentrator

Oxygen Concentrator is an electronic device that provides Oxygen to the patients by concentrating room air (ambient air) into pure oxygen.

The air we breathe is mainly comprised of Nitrogen (78%) & Oxygen (21%). This machine takes the room air using a compressor, removes Nitrogen from it and delivers medical grade Oxygen up to 95% purity.

Oxygen Concentrator

Based on the principle of Pressure Swing Adsorption (PSA) technology, these oxygen machines are now widely used in homes for oxygen therapy especially where liquid or pressurized oxygen is too dangerous or inconvenient.

Oxygen concentrator can replicate the function of an Oxygen cylinder; however, the only snag is that it uses electricity even though the power consumption is minimal.

When is it used?

Used by:
Patients who have respiratory conditions like COPD, ILD, etc. that cause low levels of oxygen in their blood.

An Oxygen Concentrator is used when a patient is prescribed supplemental Oxygen to fulfil the basic Oxygen needs of the body.

The number of hours that the physician prescribes oxygen therapy can vary from 1 to 24 hrs per day depending upon patient’s condition.

It is highly advised to start using supplemental Oxygen as soon as it is recommended by a physician.

How does it work?

The basic working of an Oxygen Concentrator is simple; it takes room air, removes Nitrogen from it and gives us medical grade O2 up to 95% purity.

Since Nitrogen and Oxygen are two main components of air with 78% Nitrogen and 21% Oxygen; the air is left with 90-95% pure Oxygen after removing Nitrogen from it.

Oxygen Concentrator working brief

Working in 4 simple steps:

  1. Room air taken in the machine
  2. Nitrogen trapped & removed from air leaving behind O2 as primary gas
  3. Adjusting the O2 delivery flow in Litres Per Minute (LPM)
  4. 90-95% pure Oxygen delivered to patient through delivery systems like Nasal cannula, mask, etc.

Main article: How does an Oxygen Concentrator work?


Stationary Oxygen Concentrator:

Staionary concentrator also known as home oxygen concentrator is the one which works only on AC mains. All stationary Oxygen Concentrators deliver continuous flow of Oxygen just like a cylinder with standard delivery systems.

It is called stationary because the patient cannot carry it all the time as an Oxygen source with him/her but it can easily be moved in home as most manufacturers manufacture models that are mounted on wheels and weigh from about 9kg (19 lbs) to 28 kg (61 lbs).

Stationary Oxygen Concentrator

Portable Oxygen Concentrator:

They are similar to home oxygen concentrators but smaller in size, lighter in weight, easy to carry and can work on battery as well as AC mains. Most portable models are pulse flow based but some have continuous mode as well.

Main article: Portable Oxygen Concentrator

Portable Oxygen Concentrator

Top Manufacturers (with models)

AirSep - About the company

Philips Respironics - About the company

  • EverFlow Concentrator
  • EverFlow Q quite Concentrator
  • Millenium M10 - Product review

Nidek Medical - About the company

  • Nuvo Lite
  • Nuvo 8

Invacare - About the company

  • Perfect O2 V
  • Platinum 10

DeVilbiss Healthcare - About the company

  • 5 Liter Oxygen Concentrator




Flow of Oxygen through the airways tends to dry them up just like normally air would do to any wet surface. In order to avoid the dryness in nose and throat of patients, a humidifier is required.

Humidifier for Oxygen Concentrator

O2 bubbles through the water in humidifier bottle and gets moistened. Usually it is said that humidification is required for flows higher than 3 Litres Per Minute (LPM). Also note that humidifier is not required in pulse flow of a portable oxygen concentrator.

O2 Delivery systems

Most commonly used O2 Delivery Sytems are: Nasal Cannula and Simple face Mask. However other than these two, some other less common systems are non-rebreathing mask, partial re-breathing mask, Trans-tracheal catheter and Ventury mask.

Nasal cannula

O2 is delivered directly to nostrils through a thin tube called Nasal cannula which is connected to the source by one end and the other end is splitted into 2 prongs & is placed in nostrils.

Patient with Nasal Cannula

Face Mask

Simple face mask is a single patient use plastic mask which is to be placed on the face of patient covering nose and lips for respiration.


  • Oxygen Concentrator is a machine that takes in room air, removes Nitrogen from it and provides 90-95% pure Oxygen to patients.
  • It is more economic and convenient than using Oxygen cylinders as it doesn't require any refills.
  • Used when a patient is prescribed supplemental Oxygen due to low Oxygen level in blood.
  • 2 types: Stationary and Portable
  • Top manufacturers: AirSep, Philips Respironics, Nidek, Invacare, DeVilbiss Healthcare
  • Accessories used with the machine are: Humidifier to moisten dry Oxygen, Nasal Cannula / Mask to deliver Oxygen to patient.
Oxygen Concentrators are increasingly becoming popular across the world. They are much more reliable than cylinders as they don’t run out of the gas and don’t require any refills; Oxygen concentrator is an economic alternative for patients who have to take Oxygen on regular basis as a medical intervention.
Buy/Rent Oxygen Concentrator in India

Medical Grade Purity guaranteed!

Oxygen Times Store
Buy/Rent Oxygen Concentrator in India

Medical Grade Purity guaranteed!

Oxygen Times Store


K D Sharma
Posted from India on: 2020-06-12 at 17:10:38
Interested in knowing more about oxygen concentrators wrt coved 19 situation, particularly for home
Rajanga Sivakumar
Posted from India on: 2018-02-09 at 18:39:49
Can a not used and unplugged Philips Respironics Everflo be covered with a plastic or any other cover for dust protection?
Yusuph Ally Hassan
Posted from TANZANIA on: 2017-12-14 at 17:09:59
Dear sir am biomedical student third l have been working on my project of desing alarming circuit for detection of any insufficient oxygen delivery to the patient in oxygen concentrator so i would like to help me to know wat is the existing system of oxygen concentrator
Vikas Madan
Posted from India on: 2017-12-01 at 20:48:34
I'm first time user. I require oxygen only at night. CO2 levels are max. at night . Pls suggest types for 8-10 hrs. for indoors. Will a 5 LPM unit do.
Oxygen Times
Replied on: 2017-12-05 at 22:35:21
Hi Vikas, only your physician can tell how much LPM of oxygen you need.
Amit Guha
Posted from India on: 2017-11-14 at 00:31:06
Where in New Delhi (close to CR Park/Nehru Place area) can one buy a good portable Oxygen concentrator
Oxygen Times
Replied on: 2017-11-14 at 04:51:49
Hi Amit, you can use our Dealer Finder Tool to find oxygen concentrator dealers in New Delhi.
R Chandrasekhar
Posted from India on: 2016-07-08 at 03:43:32
Sir Which is the best continuous stationary oxygen concentrator for up to continuous 10 lpm. Also portable continuous concentrator is available up to 10 lpm. What would be approximate price range for both of above in Indian rupees. It is required in India.
Oxygen Times
Replied on: 2016-07-15 at 08:33:12
As per our rating for 2015, AirSep Intensity 10 is the best 10 LPM oxygen concentrator available in market. No portable oxygen concentrator gives flow continuous flow upto 10LPM, however, SeQual eQuinox and SeQual Eclipse have pulse setting upto 9.
Posted from India on: 2016-05-09 at 01:42:12
Dear Sir, Could you please prescribe the best oxygen concentrator in the price range of 50K, flow range 0.0~5.0lpm for home use. As I am urgently looking for. And if possible kindly mention me the shops which can provide maximum discounts in India.
Oxygen Times
Replied on: 2016-05-09 at 03:46:44
Hi Arunava, some of the best oxygen concentrators in this price range are:
- AirSep VisionAire 5
- Nidek Nuvo Lite
- DeVilbiss 5 Liter Compact
- Philips Respironics Everflo
- Invacare Perfect O2
- AirSep Newlife Elite
You can use our dealer finder tool to locate the best oxygen concentrator dealers in India.
Bikramjit Singh Bajwa
Posted from India on: 2015-07-22 at 12:34:16
What effect the oxygen concentrator has on the people sleeping in the same room as patient
Oxygen Times
Replied on: 2015-07-23 at 03:55:28
Hello Bikramjit, the oxygen concentrator does not have any effect on the people sleeping in the same room as the patient.

Find the right Oxygen Concentrator

At Oxygen Times, you can find the most authentic information on Oxygen Concentrators with unbiased reviews, comparison, guides, product specs, dealer listings and much more.

Loading gif