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FocusTM Portable 

Oxygen Concentrator 

Service Manual 

AirSep Corporation ● 401 Creekside Drive ● Buffalo, NY 14228-2085 USA 

Telephone: 716-691-0202 ● 24-Hour Fax: 716:691-4141 ● www.airsep.com
 

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Expedited Product Warranty Check service is always at your fingertips with AirSep: 

Type www.airsep.info/warranty_check/main.asp

OR 

In the US or Canada, 

dial 866-873-9277 

AirSep® is a registered trademark of AirSep Corporation. 

■

FocusTM is a trademark of AirSep Corporation 
 

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Table of Contents 

Section 1.0 

Introduction 

 1.1 Equipment Provider Responsibility 

 1.2 Important Notice and Symbol Explanations 

 1.3 Definitions of Symbols 

 1.4 Focus Product Limited Warranty 

 1.5 Focus Specifications 

 1.6 Focus Classifications 

Section 2.0 

Operation Check and 

Test of Oxygen Concentration 

 

 2.1 Description of Operation 

 2.2 Operation Check 

 

Section 3.0 

Operating Instructions 

 3.1 General Instructions 

 3.1.1 Connecting to Focus’s Power Inlet 

 3.1.2 Power Sources Available to Focus 

3.1.3 Nasal Cannula 

3.1.4 Battery Charging 

3.1.4.1 Charging Focus Battery While Using the Power Supply with 

Focus 

3.1.4.2 Charging the Optional AirBeltTM

 

Section 4.0 

Alarm System 

Table #1 - Alarm / Priority 

 4.1 Start-up 

 4.2 Battery Status 
 

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 4.3 Low Battery 

 4.4 Discharged Battery 

 4.5 Cannula Disconnect 

 4.6 Performance Warning 

 4.6.1 Focus Capacity Exceeded 

 4.6.2 General Malfunction 

 

Section 5.0 

Oxygen Concentration Test and Specification 

Section 6.0 

Routine Maintenance / Instructions to Patient 

 6.1 Alarm / Service Indicator 

Section 7.0 

Equipment Provider Maintenance 

7.1 Equipment Provider Routine Maintenance 

7.2 Compressor Servicing 

7.3 Record Maintenance 

7.4 Infection Control 

7.5 Cleaning and Preparing for New Patient Use 

Section 8.0 

Service 

Note: At this, all repairs must be performed at AirSep’s Service Department. If your 

Focus requires service, contact your Customer Service representative to obtain an RGA 

and instructions for return to AirSep.

 

Section 9.0 

Troubleshooting 

 9.1 Troubleshooting Chart 
 

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1.0 Introduction 

 1.1 Equipment Provider Responsibility 

 

 All Equipment Providers of the FocusTM Portable Oxygen Concentrator 

 must assume responsibilities for handling, operational check-out, patient 

 instruction, and maintenance. These responsibilities are outlined below 

 and throughout this manual. 

This unit is not to be used for life support. Geriatric, pediatric, or any other patients unable to 

communicate discomfort while using this unit may require additional monitoring. Patients with 

hearing and/or sight impairment(s) may need assistance with monitoring alarms. 

 

 As an Equipment Provider, you must do all of the following: 

 ■ Inspect the condition of each Focus unit immediately upon 

 delivery to your business location. Note any sign of damage, 

 external or internal, on the delivery receipt, and report it 

 directly to both the freight company and AirSep Corporation 

 immediately. 

 ■ Check the operation of each Focus unit before delivery to a 

 patient. Always operate the unit for a minimum of 10 minutes, 

 and check that the oxygen concentration level is within 

 specifications, as described in Section 5 of this manual. 

 ■ Deliver Focus units only to patients authorized by a physician’s 

 prescription. Focus must not be used as a life-supporting 

 device. 

 ■ Instruct patients how to use Focus in conjunction with the 

 Patient Manual. 

 ■ Instruct patients to notify their physicians and/or Equipment 

 Providers if they experience any signs of discomfort. 

 ■ Be available to service each patient at any time. 

 ■ Maintain Focus in accordance with Section 7. 

 ■ Repair components and replace parts only as outlined in this 

 manual. Use only AirSep parts for replacement in Focus Oxygen 

 Concentrators. 

 ■ Refer to the “Focus Product Limited Warranty”, Section 1.4 of this 

 manual, if replacement of parts is required within the warranty 

 period. 
 

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 1.2 Important Notice and Symbol Explanations 

 As you review both the Focus Patient Manual and this Focus Service Manual, 

 pay special attention to the WARNING, CAUTION, and NOTE messages. They 

 identify safety guidelines or other important information as follows: 

 

 

Warning – Describes a hazard or unsafe 

practice that if not avoided can result in 

severe bodily injury, death or property 

damage 

Caution – Describes a hazard or unsafe 

practice that if not avoided can result in 

minor bodily injury or property damage 

Note – Provides information important 

enough to emphasize or repeat 

NO SMOKING signs should be prominently displayed in the home or wherever Focus is in use. Proper 

information about the dangers of smoking in the presence of medical oxygen should be relayed. 
 

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 1.3 Definitions of Symbols 

Symbols are frequently used on equipment and/or the manual in preference to words with the intention of 

decreasing the possibility of misunderstanding caused by language differences. Symbols can also permit easier 

comprehension of a concept within a restricted space. 

The following table is a list of symbols and definitions used with the Focus Portable Oxygen Concentrator. 

Symbol Description Symbol Description 

ON (power switch on) OFF (power switch off) 

Warning – Describes a hazard or unsafe 

practice that if not avoided can result in 

severe bodily injury, death or property 

damage 

Class II Equipment, double insulated 

Caution – Describes a hazard or unsafe 

practice that if not avoided can result in 

minor bodily injury or property damage 

Complies with the 93/42/EEC directive 

drawn up by the approved organization 

No. 0459 

Note – Provides information important 

enough to emphasize or repeat 

Safety agency for CAN/CSA C22.2 No. 

601.1 M90 for medical electrical 

equipment 

Consult the accompanying 

documents

Keep unit and accessories dry 

Use no oil or grease Proper disposal of waste of electrical and 

electronic equipment required 

No smoking Do not disassemble 

Type BF equipment Consult instructions for use 

Oxygen outlet connection to the 

cannula 

Do not expose to open flames 

Caution: Federal law (USA) restricts 

this for sale or rental by or on the order 

of a physician or licensed health care 

provider. 

Do not block fan 
 

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 1.4 Focus Product Limited Warranty 

AirSep Corporation warrants the Focus Oxygen Concentrator to be free from defect in parts for three years (as 

specified on the original invoice provided) from the date of delivery to the original purchaser, under normal use 

and operation. The batteries are warranted for one year. AirSep Corporation’s obligations under this warranty 

are limited to the repair or replacement of any such item of equipment (or part thereof) shown to be defective 

or, at AirSep Corporation’s option, to refund the purchase price of any such defective item of equipment. 

Each item of equipment for which a warranty claim is asserted shall, at the request of AirSep Corporation, be 

returned on a prepaid basis with proof of purchase date to the AirSep factory at the expense of the purchaser. 

The purchaser will be responsible for return freight charges. Replacement parts shall be warranted as stated 

above for the unexpired portion of the original three-year parts warranty (as specified on the original invoice 

provided). This warranty does not extend to any item or part subjected to misuse, accident, improper 

maintenance, or application, or which has been repaired or altered outside of the AirSep Corporation factory 

without the express prior written authorization of AirSep Corporation. 

THE FOREGOING WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, EXPRESSED OR IMPLIED, 

IN FACT OR IN LAW, INCLUDING WITHOUT LIMITATION THE WARRANTY OF 

MERCHANTABILITY OR THE WARRANTY OF FITNESS FOR PARTICULAR PURPOSE. IT IS 

EXPRESSLY UNDERSTOOD THAT PURCHASER’S SOLE AND EXCLUSIVE REMEDY FOR DEFECT 

IN PARTS IS LIMITED TO ENFORCEMENT OF AIRSEP CORPORATION’S OBLIGATION AS SET 

FORTH ABOVE, AND AIRSEP CORPORATION SHALL NOT BE LIABLE TO PURCHASER OR 

OTHERS FOR LOSS OF USE OF THE EQUIPMENT OR FOR OTHER SPECIAL, INDIRECT, 

INCIDENTAL, OR CONSEQUENTIAL DAMAGES. 
 

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 1.5 Focus Specifications 

Oxygen Concentration:* 90% oxygen - 3% / +5.5% 

Dimensions: 6.4 in. high x 4.8 in. wide x 2.5 in. deep (16.4 cm high x 12.2 cm wide x 6.1 deep) 

Weight: Concentrator 1.75 lb (0.8 kg) 

Battery 0.53 lb (0.2 kg) 

Optional AirBelt Battery 1.8 lb (0.8 kg) 

Power: 

 

Universal Power Supply: 

AC Power Supply: Input # 1_100 – 240 VAC (1.5 Amps max at 120 VAC 50/60 Hz) 

DC Power Supply: Input # 2_11-16 VDC 5.0 Amps max 

 

Battery duration 

(Rechargeable 

 lithium Battery) 

Battery: 1 1⁄2 hours (per battery) 

Optional AirBelt Battery: 4 hours 

 

Battery recharge time: 

 

4 hours; optional AirBelt: 3 1⁄2 hours 

Warm-up time: 2 minutes 

Battery cycle life: 

 

Approximately 300 cycles, then 80% capacity or below. 

Audible alarms and pulse 

visual indicators: 

Start-up – audible and visual 

Pulse flow – visual 

Cannula disconnect- audible and visual 

Breath rate alarm – audible and visual 

General malfunction – audible and visual 

Service required - visual 

Low battery - audible and visual

Battery condition – battery level indicator on battery 

Temperature range: Normal operating temperature: 41°F to 104°F (5°C to 40°C) 

Storage temperature: -2°F to 140°F (-20°C to 60°C) 

 * Based on an atmospheric pressure of 14.7 psi (101 kPa) at 70°F (21°C) 

 * Operating unit outside of normal operational temperature range can affect performance.
 

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 1.6 Focus Classifications 

Type of protection against electric shock: 

 Class II Protection from electric shock is achieved by double insulation. 

Degree of protection against electric shock: 

 Type BF Equipment providing a particular degree of protection against electric shock regarding 

1) allowable leakage current; 

2) reliability of protective earth connection (if present). 

Not intended for direct cardiac application. 

Independent testing for Medical Electrical Equipment Standard: 

 Tested by QPS Testing Services NA Inc. to be in compliance with, 

 IEC 60601-1 Medical Electrical Equipment – Part 1: General Requirements for Safety 

 2nd edition 1988, A1 1991, A2 1995. 

Tested by QPS to be in compliance with applicable requirements of the Standard, 

CAN/CSA C22.2 No. 601.1-M90 Medical Electrical Equipment – Part 1: General 

Requirements for Safety, General instruction No. 1; Supplement No. 1; 1994 

 Amendment 2 – 1998 and General instruction No. 2 November 2003 

Protection against potential electromagnetic or other interference between the equipment and other devices. 

 Tested by Ultratech Group of Labs to be in compliance with: 

EN 60601-1-2:2007 (EMC) (2nd Edition), Medical Electrical Equipment, Part 1: General 

Requirements for Safety-Collateral Standard: Electrical Compatibility - Requirements and Tests 

RTCA-DO160F Airborne Equipment, Sec. 21, Emission of Radio Frequency Energy 

CISPR 11:2009 +A1:2010 / EN 55011:2009, Class B Group 1, “Industrial, Scientific, and Medical 

(ISM) Equipment” 

FCC Part 15, Subpart B – Class B Unintentional Radiators 

Method of cleaning and infection control allowed: 

 Please refer to “Cleaning, Care, and Proper Maintenance” section of this Focus Patient 

 Manual. 

Degree of safety of application in the presence of flammable anesthetic gases: 

 Equipment not suited for such application. 

Mode of operation: 

 Continuous duty. 
 

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2.0 Operation Check and Test of Oxygen Concentration 

 2.1 Description of Operation 

Air enters the Focus Oxygen Concentrator through an external air intake. 

 This air enters the compressor via a suction resonator that quiets the compressor’s suction sound. 

The pressurized air then exits the compressor to a two-way solenoid feed valve that directs the air into 

one of two sieve beds that contain molecular sieve. The unique property of molecular sieve enables it to 

physically attract (adsorb) nitrogen when air passes through this material, thereby separating the 

nitrogen from the oxygen in ambient air. 

There are two sieve beds: While one produces high-concentration oxygen, the other is purged of the 

nitrogen it adsorbed (collected) while it made oxygen. Oxygen exits the product tank after first passing 

through the integrated product filter. 

In addition to the molecular sieve beds that allow oxygen to be separated from air, Focus contains an 

Oxygen Conserving Device (OCD) valve that controls delivery of high-concentration oxygen to the 

patient at the point in the breathing cycle when the patient starts to inhale. 

Focus delivers a gas consisting of 90% (+5.5%/-3%) oxygen at a pulse flow rate equivalent to 2 LPM 

(liters per minute) constant flow. 

2.2 Operation Check 

AirSep tests every Focus Oxygen Concentrator thoroughly after manufacture. You must perform the 

following test to ensure that no damage occurred in shipping or handling. 

 1. Open and inspect all cartons upon delivery. Unpack the unit and remove 

 it from the carton. Inspect the unit itself for damage. 

 If the exterior of a unit’s carton is damaged, or if the unit itself is damaged, 

 note this on the freight bill signed by the driver. 

2. Connect the power supply or battery to the unit. Turn the Focus unit on by pressing the 

power switch to the on position (l). Refer to Section 3 for operating instructions. 

3. Check to see that the following sequence occurs: 

a. When Focus is turned on, [A one-second, audible alarm sounds to indicate start-up. The 

green and red LED’s on the control panel will alternate on/off for (10) seconds. After the 

(10) second start up is complete the green LED will be illuminated indicating that the 

Focus is ready to be used.] 

 b. The compressor runs. 

 c. Exhaust air flows from the unit. 

 4. Perform an oxygen concentration test, as described in Section 5. 
 

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3.0 Operating Instructions 

3.1 General Instructions 

It is important that patients thoroughly understand how to operate AirSep’s Focus unit. 

 This enables proper treatment as prescribed by a qualified, licensed physician. You must explain 

 that the purpose of this therapy is to alleviate symptoms. If patients experience any discomfort or if 

 the unit alarms, they must notify their Equipment Provider and/or physician immediately. 

 You, as the Equipment Provider, are responsible to ensure that each patient receives the Focus 

Patient Manual. Explain each step in the operation of the unit to the patient with reference to the patient 

manual. 

Instruct patients that AirSep recommends that Focus should be used while sleeping only under the 

direction of their clinician. In addition, some patients who tend to be mouth-breathers may benefit from 

the use of a chin strap. 

3.1.1 Connecting to Focus’s Power Inlet 

Locate the arrow marking at the top of the connector. Insert connector (Figure 1) into the Focus 

power inlet (Figure 2) with the arrow on the side of the connector facing outward. Do not force 

the connector into the power inlet, as it can be inserted only one way. This ensures that neither 

the unit nor the power accessories are damaged. 

 Turn the Focus unit on by pressing the power switch to the on position (l). 

\ 

3.1.2 Power Sources available to Focus 

3.1.2.1 Focus operates from four different power sources. 

NOTE: Always connect to the Focus power inlet first before connecting to a power 

supply. 

1) Connecting Focus to AC electrical power 

When you are near an AC outlet, you may choose to operate Focus with the universal power 

supply rather than the battery.Connect the cord on the power supply labeled as DC OUT To 

Focus into the Focus unit’s power inlet,as shown in Figure 3. Do not force the plug, as it should 

be inserted only one way. Plug the 3-prong AC cord from the power supply into any standard 

outlet. 

Turn the Focus unit on by pressing the power switch to the on position (l). 

Focus units 

Power Inlet 

 Figure: 2 

Focus units 

power 

connector 

 

 Figure: 1 
 

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2) Connecting Focus to a DC power source 

The universal power supply can also be used to operate the Focus unit from any 12-Volt DC 

power source. 

 For example: to an automobile, (boat, motor home, etc.) with a 12-Volt DC outlet. 

Connect the power supply cord labeled DC OUT To Focus into the Focus unit’s power inlet, as 

shown in Figure 3. Place the DC accessory adapter on the end of the DC power cord. 

Connect the other end into the power supply input connection labeled Accessory DC IN 

(see Figure 4). 

You can then connect the DC power cord (with adapter attached) into the 12-Volt DC power 

source. Do not force the cords, as they can be inserted only one way. 

 Turn the Focus unit on by pressing the power switch to the on position (l). 

 

 Focus unit’s Power Inlet 

 

 

 

 DC OUT to Focus 

 

 

 

Figure: 3 

 

 

 Connect to Focus 

 

 

 Accessory DC IN 

 

Figure: 4

DC OUT to Focus 

 DC accessory adapter 

 

 DC power cord 
 

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3) Connecting Focus with the Battery, as shown:

Before using the battery, check that it has a sufficient charge. 

The battery is equipped with a gauge (Figure 9) to indicate the level of battery charge (25-

100%). To check the level of charge of the battery, press the button on the battery’s keypad. 

The battery gauge/indicator(s) LEDs to the left of the button illuminate to indicate the level of 

battery charge (25-100%). Connect the switch end of the battery cord into the Focus unit’s 

power inlet only, as shown in Figures 5 and 6.Connect the other end into the battery. Do not 

force the cords, as they can be properly inserted only one way. 

 Refer to the instructions on charging the battery in the Battery Charging section. 

4) Connecting Focus with the Optional AirBeltTM Battery

Check that the AirBelt is sufficiently charged. It requires approximately 3 1⁄2 hours to completely 

charge. AirBelt (Figure 7) is equipped with a fuel gauge to indicate the level of battery charge 

(25-100%). To check the level of charge, press the button on the AirBelt keypad. The battery 

gauge/indicator(s) illuminate to indicate the level of battery charge (25-100%). Connect the 

interface cable (Figure 8) into the AirBelt, then plug the other end of the interface cable into the 

Focus, as shown in Figure 9. For proper orientation of the connector, see Connecting to the 

Focus Power Inlet section. Turn the Focus unit on by pressing the power switch to the on 

position (l). 

Refer to the instructions on charging the battery in the Battery Charging section. 

Focus units Power Inlet 

 

 Battery Gauge 

 

 Belt / Shoulder Figure: 6 

 Strap clip 

 Figure: 5

 Figure: 8 

AirBelt to 

Focus cord

Figure: 7 

AirBelt 

AirBelt 

battery 

charge level 

Figure: 9 

AirBelt 

battery 

AirBelt to 

Focus 

connection 
 

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3.1.3 Nasal Cannula 

A nasal cannula with tubing are used to deliver oxygen from the Focus unit to the user. 

The tubing is connected to the unit’s oxygen outlet (Figure 10). 

AirSep recommends a nasal cannula with 7 ft (2.1 m) of tubing, AirSep Part No. CU002-1 or suitable 

cannula. Other lengths of non-kinking / star channel cannula can be used for a total length of up to 25 ft 

(7.6 m) maximum. 

When Focus is operating but does not sense breathing for 15 minutes, a constant alarm sounds, and the 

amber alarm light illuminates simultaneously. If this occurs, check the connection from the cannula to 

the Focus unit, make sure that the nasal cannula is positioned properly on your face, and ensure that you 

are breathing through your nose. (Your physician may recommend the use of a chin strap if needed.) If 

the alarm condition continues, change to another source of oxygen as available, and contact your 

Equipment Provider. 

Always follow the cannula manufacturer’s instructions for proper use. Consult your licensed health care 

provider to determine how often the cannula should be replaced. 

Cannula tubing must be non-kinking, which can be used for a total length of up to 25ft (7.6cm) maximum. 

 

Ensure the cannula is fully inserted and secure. This ensures that the Focus unit can properly detect 

inspiration for oxygen delivery. 

 

 

Connect the Cannula to 

Focus’s Oxygen Outlet

 

Focus Power Inlet 

Figure: 10 
 

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3.1.4 Battery Charging 

To check the level of charge of the battery, press the button on the battery’s keypad. The battery 

gauge/indicator(s) illuminate to indicate the level of battery charge (25-100%). 

3.1.4.1 To charge the Focus battery while using the power supply with Focus

 

1a) Using AC Power: Follow the instructions in the Connecting Focus to AC electrical power 

 section. 

1b) Using DC Power: Follow the instructions in the Connecting Focus with the Battery section. 

 2) Connect the battery cord without the on / off switch into the power supply outlet marked DC 

 OUT To Battery. Connect the other end to the battery. 

 Note: The battery is charging whenever the unit operates on AC or DC power. 

 

The Focus battery will completely recharge from its fully depleted state in 

 approximately four hours, whether or not the unit is in use on AC or DC power. 

While charging a fully discharged battery, the LED will continue to blink until 25% 

 capacity is reached. The LED will then turn solid. 

Each of the four LEDs, 25% -100%, will blink as stated above, then turn solid when 

 they reach their capacity. 

When all LEDs illuminate solid, the battery is fully charged and the LEDs will remain 

 solid for a period of time, then all four LEDs will turn off. 

Wherever storing Focus battery for an extended period of time, ensure that the battery state of 

charge (SOC) is not depleted or stored at 100%. Both these conditions can result in 

unrecoverable capacity loss. The recommended SOC is 25% to 50% for long-term storage. 

The recommended storage temperature is 23o

C +/- 2oC. 

 

The Battery can be recharged from the power 

supply while using Focus AC or DC power.

 

Figure: 11
 

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3.1.4.2 Charging the Optional AirBelt 

 To charge the AirBelt battery: 

1) Release safetycap from end of the AirBelt cord. 

2) Connect the AC/DC power supply (included with the AirBelt Accessory kit) to the end of 

AirBelts power cord as shown in Figure 12. 

3) Connect the AirBelt power supply to an AC electrical outlet to recharge. 

Replace safety cap on AirBelt cord when not in use. 

Do not attempt to charge the optional AirBelt with the Focus power supply or the AirBelt can be 

damaged. Use only the AirBelt power supply provided to charge AirBelt. 

 

 The Focus AirBelt will completely recharge from its fully depleted state in approximately 3 1⁄2 hours. 

 While charging a fully discharged battery, the LED will continue to blink until 25% capacity is reached. The LED 

will then turn solid. 

 Each of the four LEDs, 25% -100%, will blink as stated above, then turn solid when the battery reaches it’s 

capacity. 

 When all LEDs illuminate solid, the battery is fully charged and the LEDs will remain solid for a period of time, then 

all four LEDs will turn off. 



The incorrect use of AirBelt can cause it to get hot, ignite, and may cause serious injury. Be sure not to 

pierce, strike, step on, or drop the battery, or otherwise subject the battery to strong impacts or shocks. 

Do not store Focus or AirBelt in a very hot automobile or in other similar, high- or low-temperature 

environments. Operating or storing the AirBelt outside the normal temperature range can affect its 

performance. (Refer to the Specifications section in this manual.) 

 Figure 12: AirBelt Battery Charging set up 

AirBelt 

 

 AC/DC Power Supply 

Connecting the AirBelt cord to the power supply cord 

 
 

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Storing your AirBelt for extended periods of time at high temperatures or with a fully charged or 

completely discharged battery can degrade its overall battery life. 

Depending upon the temperature of the Focus battery, it can take several minutes for the charging cycle 

to start after connecting to power. This is a normal condition and is intended for safe charging. 

AirBelt does not need to be fully discharged before recharging. It is recommended to charge it after each 

use. 

If the AirBelt power supply remains connected when it is fully charged, the four LEDs will turn off within 1⁄2 

hour. 

4.0 Alarm System 

An audible alarm sounds simultaneously with a visual alarm if the Focus units battery is 

low, senses no inspiration, or if performance is outside specifications. If an alarm sounds 

observe which lights are on. The visual and audible alarm conditions are explained in 

detail below. 

ALARM / 

PRIORITY 

VISUAL AUDIBLE (Buzzer) 

1.)High Temperature (Red) 3 - half second flashes and 

a 5 second pause 

3 half second beeps and a 5 

second pause 

(beep, beep, beep) 

2.) Battery Warning (Amber) 1 – half second flash 

and a 5 second pause 

1 – half second beep and a 5 

second pause 

(beep) 

 Battery Shutdown (Amber) 2 – half second flash 

and a 5 second pause 

2 – half second beeps and a 5 

second pause 

(beep, beep) 

3.) No Inspiration (Amber) Solid Continuous beep 

4.) Malfunction Red) 2 – half second flashes and 

a 5 second pause 

2 – half second beeps and a 5 

second pause 

(beep, beep) 

5.) Breath rate 

exceeded 

(Amber) 3 - half second flashes 

and a 5 second pause 

3 half second beeps and a 5 

second pause 

(beep, beep, beep) 

6.) Service Alarm (Amber) Solid No beep 

Table # 1 Alarm / Priority 
 

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4.1 Start-Up 

A one-second, audible alarm sounds to indicate start-up. The green and red LED’s on the control 

panel will alternate on/off for (10) seconds. During this (10) seconds both feed and waste valves 

are open. After the (10) second start up is complete the green LED will be illuminated indicating 

that the Focus is ready to be used. 

4.2 Battery Status 

 To check the level of charge of the battery, press the button on 

 Focus battery keypad. The battery gauge / indicator(s) LEDs next 

 the button illuminate from 25-100% to indicate the level (capacity) 

of the internal battery. At less than 25% capacity, the 25% LED blinks. 

4.3 Low Battery 

Focus unit indicators: As the battery power approaches a low level, the amber light on the 

Focus unit will flash on for 1⁄2 second with a 5-second pause and simultaneously, a 1⁄2 second 

alarm sounds with a 5-second pause. Following the battery warning indicators, if action is not 

taken, the unit will shut down. This will be indicated when the amber light flashes 2 times with a 

5-second pause and simultaneously, a 1⁄2 second alarm sounds 2 times with a 5 second pause. 

Battery indicator: The green light indicator on the battery gauge light flashes.

When this occurs, the patient is instructed to, connect Focus to a DC power outlet or to an AC 

power outlet, or change to another source of oxygen immediately. The level of battery charge is 

indicated by the battery gauge/indicator(s). You can also check the SOC (state of charge) at any 

time by depressing the button. 

When the unit is connected to AC or DC power outlet, you may simultaneously charge the Focus 

battery supplied with the unit while running the unit 

4.4 Discharged Battery 

 Battery shutdown indicator on Focus control panel: When the battery is fully discharged, the

unit shuts down. Before this occurs the amber light flashes 2 times with a 5-second pause and 

simultaneously, a 1⁄2 second alarm sounds 2 times with a 5 second pause. 

 

 Battery indicator: The green light indicator on the battery gauge light flashes. 

When this occurs, the patient is instructed to, connect Focus to a DC power outlet or to an 

AC power outlet, or change to another source of oxygen immediately. The level of 

battery charge is indicated by the battery gauge/indicator(s). You can also check the SOC 

(state of charge) at any time by depressing the button. 

When the unit is connected to AC or DC power outlet, you may simultaneously charge 

the Focus battery supplied with the unit while running the unit 

4.5 Cannula Disconnect (No inspiration detected) 

When Focus is operating but does not sense breathing for 15 consecutive minutes, a constant 

alarm sounds, and the amber alarm light illuminates simultaneously. If this occurs, check the 

connection from the cannula to the Focus unit, make sure that the nasal cannula is positioned 

properly on your face, and ensure that you are breathing through your nose. (Your physician may 

recommend the use of a chin strap if needed.) If the alarm condition continues, change to another 

source of oxygen as available, and contact your Equipment Provider 
 

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4.6 Performance Warning 

 The performance of Focus can be affected by two conditions. 

1) If the user’s breathing rate causes the Focus unit’s capacity 

 to be exceeded. 

 2) The second condition that can result in decreased performance is a 

 general malfunction (i.e. High temperature, High or Low pressure). 

 4.6.1 Focus Capacity Exceeded 

When the patient’s breathing rate has caused the capacity of Focus to be exceeded, an alarm 

sounds 3 times every 1⁄2 second with a 5 second pause, and the amber alarm light illuminates 

simultaneously (See Table 1). 

When this occurs, the concentration of oxygen that Focus is supplying is outside of the unit 

specifications. The patient is advised to reduce any physical activity, reset alarm by turning unit 

off and back on, and then if necessary change to another source of oxygen as available, and 

contact your Equipment Provider 

 4.6.2 General Malfunction 

If Focus has a general malfunction, an audible alarm sounds and the red alarm light illuminates 

(See Table 1). 

If this alarm condition occurs, the patient is advised to change to another source of oxygen as 

available, and contact your Equipment Provider 

 

5.0 Oxygen Concentration Test and Specification 

 To ensure that Focus’s oxygen output is within specification, you must 

 perform an oxygen concentration test. Test the unit upon delivery to a 

 patient and at periodic intervals. Equipment Providers, based upon their 

 own expertise and documentation, may establish and implement their own 

 protocol to check oxygen concentration. The interval established may be 

 longer or shorter than 90 days, AirSep’s default time period for providers 

 who do not choose to establish their own protocol. 

5.1. Connect the Focus Oxygen Concentrator to an AirSep-supplied AC power supply (AirSep Part 

No. PW019-1). 

 

5.2. To activate the unit’s test mode: 

5.2.1 Focus unit off before 4 seconds expires. 

5.2.2 Turn the unit on and then off again during the 10 second start up sequence. The user has a 

maximum of 6 seconds to complete this task. 

5.2.3 Repeat step 5.2.2 

5.2.4 Turn the unit on and let it remain on. 

5.3. Verify Focus is pulsing by observing the intermittent green LED. 
 

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When the unit pulses, you should be able to hear the pulse of oxygen and see the LED turn off 

momentarily. Allow Focus to run for 5 minutes before recording the oxygen concentration of the 

unit. 

5.4. With a short length of tubing 12 in. (30 cm), connect a calibrated 

 Teledyne Analytical Instruments oxygen analyzer (Model AX-300) 

 or Fujikura Oxygen Analyzer (Model FCX-HOM or FCX-OM3). 

 to the oxygen outlet on the Focus concentrator. Turn on the 

 analyzer and record the unit’s concentration. The concentration 

 specification in test mode is 87% or greater. 

 

6.0 Routine Maintenance Instruction for Patient 

To ensure accurate output and efficient operation of the unit, the patient must contact the 

Equipment Provider for inspection/service when the alarm/service indicator illuminates. 

 

6.1 Alarm/Service Indicator 

The Focus unit should be serviced after every 5,000 hours of use. This should include replacing 

the compressor felt filter, a check of oxygen concentration, etc. When the unit has reached 5,000 

hours of use, an amber LED will illuminate on the right side of the unit’s control panel. Instruct 

patients to notify the Equipment Provider when this happens. 

 If the oxygen concentration of the unit is below 87%, the system’s operating pressure should 

be measured to verify the compressor is functioning within specification. If the system pressure 

is below 19 psig (131 kPa), make sure that the unit is leak-free by testing all tubing connections 

and fittings with leak-testing solution. If no leaks are present, replace the compressor. 

 

AirSep does not recommend the sterilization of this equipment. 

7.0 Equipment Provider Maintenance 

7.1 Equipment Provider Routine Maintenance 

 The Focus unit includes one filter and a compressor that require scheduled maintenance 

or replacement. 

To ensure that the output of oxygen is within specification, you must perform an oxygen 

concentration test. (Refer to Section 5, “Oxygen Concentration Test and Specification,” of this 

manual.) Test the unit upon delivery to a patient and at periodic intervals. Equipment 

Providers, based on their expertise and documentation, may establish and implement their own 

protocol to check oxygen concentration. The interval established may be longer or shorter than 

90 days, AirSep’s default time period for providers who do not choose to establish their 

 own protocol. 

7.2 Compressor Servicing 

As the Equipment Provider, you are responsible for monitoring the life of the compressor, which 

must be checked at every 5,000 hours of use. 
 

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7.3 Recording Maintenance 

As the Equipment Provider, you should record all routine maintenance and repairs performed on 

the Focus unit, including hours and dates of service. 

7.4 Infection Control 

With growing concern about possible cross infection from home oxygen equipment from one 

home care patient to another, a clarification on this topic is necessary. The organisms of most 

concern are M.Tuberculosis, HIV, and Viral Hepatitis. These are potentially pathogenic. 

Tuberculosis can survive outside the human body, but its mode of transmission is by droplet 

nuclei. When infected individuals cough, they release droplet nuclei into the air, and these carry 

the Tuberculosis organism. These droplet nuclei may be breathed in by another person, but 

prolonged exposure to the infected person is usually necessary for infection to occur. 

HIV and Viral Hepatitis are both viruses that are not living cells themselves but can duplicate 

when in a living “host” cell. Both of these organisms are usually passed on by person-toperson contact, and both need to be in the human body to survive. Once outside the body, viruses 

do not survive. 

7.5 Cleaning and Preparing for New Patient Use 

When you remove Focus from a patient’s home, always detach and dispose of the used nasal 

cannula. Clean the exterior of Focus with a mild household cleaner applied with a damp cloth or 

sponge. Pay special attention to the oxygen outlet for the cannula connection to make sure it 

remains free of dust, water, and particles. Be careful not to get any liquid into the interior of the 

unit. 

Next, clean the exterior with a common chemical disinfectant before any other patient uses the 

unit. Do not use liquid directly on the Focus unit to clean it. 

Do not use liquid directly on the Focus unit to clean it. A list of undesirable chemical agents 

includes but is not limited to, the following, according to the plastics manufacturer: alcohol and 

alcohol-based products, concentrated chlorine-based products (ethylene chloride), and oil-based 

products (Pine-Sol, Lestoil). These are NOT to be used to clean the plastic housing on Focus, 

they can damage the units plastic. 

Allow Focus to air dry, and then re-test oxygen concentration before you 

return the unit to your inventory. 

_______________________________________________________________ 

*Make the bleach solution a 1:100 dilution of 5.25% sodium hypochlorite. 

Mix one part household bleach (e.g., Clorox with 99 parts cold tap 

water) to measure the solution easily, take 1⁄4 cup of household bleach, 

and mix it with a gallon of cold tap water. Allow the mixture to sit on 

potentially contaminated surfaces for 10 minutes. 

AirSep does not recommend the sterilization of this equipment. 
 

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8.0 Service 

8.1 Note: At this, all repairs must be performed at AirSep’s Service Department. If 

your Focus requires service, contact your Customer Service representative to 

obtain an RGA and instructions for return to AirSep. 

 

9.0 Troubleshooting 

Problem Possible Cause Solution 

Unit does not turn on, 

and AC power supply is 

properly connected to a wall 

outlet. 

Wall switch power is off. 

No power to unit. 

Unit temperature has exceeded 

battery operating temperature 5 to 

40o

C. 

AC power supply is not properly 

connected to Focus. 

Defective AC power supply. 

Turn on wall or outlet switch. 

Reset household circuit 

breaker. 

Allow unit to cool before 

starting. 

Check connection from the 

AC adapter to Focus. 

Replace AC adapter. 

Unit does not turn on, and DC 

power supply is properly 

connected to an automobile, 

RV, accessory outlet. 

No power at DC outlet 

DC power supply is not connected 

to accessory outlet or not connected 

to Focus. 

Defective DC power supply 

Unknown 

Check fuse for DC outlet. 

Connect DC power supply to 

outlet of automobile after 

ignition is started. 

Replace power supply. 

Return to AirSep. 

General malfunction; alarm is 

activated. 

Unit overheats and will shut down. 

Check air inlet and exhaust vents for 

obstruction. 

Unknown 

Clear obstruction at air inlet 

and exhaust. 

Return To AirSep 

Battery duration is less than 

per specification. 

.

Battery not fully charged. 

Battery has been stored in a 

discharged or 100% charged state 

for prolonged period of time or 

stored in a very high temperature 

environment. 

Battery reached cycle life. 

Ensure that battery charges 

for at least 3-1/2 hours and all 

(4) LEDs are lit solid. 

Replace battery. 

Replace Battery. 

Unit does not start on battery. Battery temperature has exceeded 

battery operating temperature 5 to 

40o

C. 

Focus is not turned on. 

Battery is depleted 

Allow battery to cool before 

starting. 

Turn Focus on. 

Replace battery 
 

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Problem Possible Cause Solution 

Battery does not charge. Battery temperature has exceeded 

battery operating temperature 5 to 

40oC. 

Battery is defective. 

AC adapter connector is defective or 

contact pin is bent. 

Defective AC adapter 

Allow battery to cool before 

charging. 

Replace battery 

Replace battery 

Replace AC adapter. 

Oxygen concentration is below 

specifications in test mode. 

Unknown Return to AirSep. 

Unit does not deliver oxygen. Cannula kinked or not properly 

connected. 

Unknown 

Check cannula and the 

cannula connection. 

Return to AirSep.