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Inogen One G4 Portable Oxygen Concentrator

The Inogen One G4 is a portable oxygen concentrator designed to provide supplemental oxygen to patients who require oxygen therapy. This lightweight, compact device allows users to enjoy an active lifestyle without being tethered to stationary oxygen equipment.

In this comprehensive guide, we’ll explore the key features, specifications, maintenance, and troubleshooting of the Inogen One G4 portable oxygen concentrator. 

What this article covers:

How Does the Inogen One G4 Work?

The Inogen One G4 is an oxygen concentrating system that utilizes pressure swing adsorption technology to extract oxygen directly from the surrounding air. One question often asked about this system is, "how long does the Inogen G4 battery last?"

Ambient air is drawn into the concentrator through an intake filter which removes large particles. Occasionally, users have reported an "odor from oxygen concentrator." The air then passes through two molecular sieve beds containing zeolite material. As the air passes through these beds, nitrogen is adsorbed by the zeolite while oxygen is passed through and concentrated.

inogen g4 issues

The concentrated oxygen is temporarily stored in a reservoir before being delivered to the patient through the nasal cannula. The Inogen One G4 can provide oxygen concentrations of 90% +/- 3% at flow settings from 1 to 3 liters per minute. For any operational concerns, "Inogen One G4 troubleshooting" is a commonly researched topic.

Main Clinic Supply Toll-Free Phone Number: 1-800-775-0942 

Key Benefits of the Inogen One G4

  • Portability - Weighing only 2.8 lbs with a single battery installed, the Inogen One G4 is designed for portability and travel.
  • Independence - With battery durations up to 3 hours, users gain independence from stationary oxygen systems. But if you find the "Inogen battery not charging", it might be necessary to consult the troubleshooting guide or contact support.
  • Reliability - The Inogen One G4 provides a reliable source of supplemental oxygen without relying on deliveries of tanks or liquid oxygen. Any issues might require "Invacare oxygen concentrator repair" or assistance from the manufacturer.
  • User-Friendly - With only 3 simple flow settings, the Inogen One G4 is easy for patients to operate and monitor.
  • Warranty - The Inogen One G4 comes with a 3 year warranty on the concentrator, 1 year warranty on the battery.

Inogen One G4 System Components

The Inogen One G4 is made up of the following key components:

  • Concentrator - The main unit which produces and delivers oxygen. Weighs only 2.8 lbs.
  • Battery - A rechargeable lithium ion battery provides cordless operation. The BA-400 standard battery provides up to 3 hours of operation.
  • Power Supply - An AC power supply (BA-401) is used to recharge the battery and power the unit from an electrical outlet.
  • Accessories - A nasal cannula, carry bag, and mobile cart are also included.

Technical Specifications

  • Dimensions: 5.91” x 2.68” x 6.45” (with single battery installed)
  • Weight: 2.8 lbs (with 1 battery)
  • Warm-Up Time: 2 minutes
  • Oxygen Concentration: 90% +/- 3%
  • Flow Settings: 3 settings from 1 to 3 liters per minute
  • Sound Level: 40 dB at setting 2
  • Power: AC power supply, rechargeable lithium ion battery
  • Battery Duration: Up to 3 hours with 1 battery on setting 2
  • Environmental Ranges: 41°F to 104°F, 0-95% humidity, 0-10,000 ft altitude 
inogen g4 troubleshooting

Setting up the Inogen One G4

To quickly set up a patient on the Inogen One G4 system:

  1. Slide the battery into the bottom of the concentrator until it clicks into place.
  2. Place the concentrator in a well-ventilated location with clear access to the air intake and exhaust.
  3. Connect the AC power supply to the concentrator and plug it into an electrical outlet.
  4. Attach the nasal cannula tubing to the nozzle fitting.
  5. Turn on the Inogen One G4 by pressing the power button.
  6. Use the + and - buttons to adjust the flow setting prescribed by the physician.

Selecting the Proper Flow Setting

The Inogen One G4 has 3 marked flow settings ranging from 1 to 3. These settings provide a general guideline for matching the continuous flow prescription from the physician.

However, Inogen recommends titrating each patient at rest and during activity to ensure the proper setting is selected. Factors like breathing rate, tidal volume, and cannula type can impact the fraction of inspired oxygen.

At each setting, the Inogen One G4 delivers a fixed volume bolus of oxygen, approximately:

  • Setting 1 - 21 ml
  • Setting 2 - 42 ml
  • Setting 3 - 63 ml

So with a slower breathing rate, the patient will receive larger boluses. Faster breathing results in smaller boluses per breath.

Routine Maintenance

Regular maintenance is important to keep the Inogen One G4 performing optimally. Here are some key maintenance tasks:

Output Filter Replacement

  • Replace the output filter between patients to protect from potential cross-contamination.
  • Use the provided cannula barb tool to access and replace the small filter located behind the nozzle fitting.
problems with inogen one g4

Particle Filter Cleaning

  • Clean the intake particle filter weekly using mild detergent and water to maintain air flow.
  • Replace filters as needed if they become worn or obstructed.

Column Changes

  • Replace the molecular sieve bed columns every 12-24 months or when indicated on the display.
  • Press and hold the + and - buttons simultaneously after installation to reset the system.

Battery Care

  • Only use batteries specifically designed for the Inogen One G4.
  • Charge the batteries fully before first use and regularly during operation.
  • Remove battery when not in use to avoid inadvertent discharge.
  • Avoid exposing batteries to extreme temperatures outside the range of -4°F to 158°F.

Troubleshooting Inogen One G4 Errors

The Inogen One G4 displays different priority levels of errors and troubleshooting suggestions on the LCD screen:

Low Priority Errors

  • Battery Low - Charge battery
  • Remove Battery to Cool - Battery is overheated
  • Check Battery - Battery communication error

Medium Priority Errors

  • Oxygen Error - Oxygen production is low
  • No Breath Detect - Check cannula interface
  • Battery Hot - Battery overheated

High Priority Errors

  • Battery Empty - Attach power supply
  • System Error - Reset system
  • System Hot/Cold - Allow to warm/cool and restart

See the user manual for full details on all troubleshooting error messages. Contact Inogen support if any error persists after troubleshooting.  

inogen g4 technical problems


The Inogen One G4 portable oxygen concentrator provides patients requiring long-term oxygen therapy with a reliable, convenient supplemental oxygen solution. Make sure to review the full technical and service manual for maintenance procedures and troubleshooting assistance.

With its lightweight design, long battery life, and easy operation, the Inogen One G4 gives users the freedom and independence to be active without limiting their oxygen therapy needs.

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