FreeStyle™ 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.
Expedited Product Warranty Check service is always at your fingertips with AirSep: http://www.airsep.com/Support/Warranty_Information.aspx OR In the US or Canada, dial 866-873-9277 Air Travel with FreeStyle FreeStyle is approved for use on-board commercial aircraft per an addendum to FAA SFAR 106. AirSep® is a registered trademark of AirSep Corporation. n FreeStyle™ is a trademark of AirSep Corporation. MN126-1 Rev.
Table of Contents Section 1.0 Introduction 1.1 Equipment Provider Responsibility 1-1 1.2 Important Notice and Symbol Explanations 1-2 1.3 Definitions of Symbols 1-3 1.4 FreeStyle Specifications 1-4 1.5 FreeStyle Classifications 1-5 2.1 Description of Operation 2-1 2.2 Operation Check 2-1 2.3 Alarm System 2-2 2.3.1 Start-up 2-2 2.3.2 Battery Status 2-2 2.3.3 Low Battery 2-2 2.3.4 Discharged Battery 2-2 2.3.5 Battery Charging 2-3 2.3.6 Battery Fully Charged 2-4 2.3.
3.2.1 Cleaning the Air Intake Gross Particle Filter 3-4 3.2.2 Alarm/Service Indicator 3-5 3.2.3 Nasal Cannula 3-5 3.2.4 Usage During Sleep 3-5 Section 4.0 Equipment Provider Maintenance 4.1 No Scheduled Maintenance 4-1 4.1.1 Air Intake / Gross Particle Filter 4-1 4.1.2 Product Filter Replacement 4-1 4.1.3 Compressor Servicing 4-2 4.1.4 Recording Maintenance 4-2 4.2 Infection Control 4-2 4.3 Cleaning and Preparing for New Patient Use 4-2 5.1 Components 5-1 5.
.13 Circuit Board Replacement 5-21 5.14 Motor Controller Board Replacement 5-25 5.15 Control/Key Panel Replacement 5-27 5.16 Fan Replacement 5-31 6.1 Pressure Profile Quadrant 6-1 7.1 General Troubleshooting 7-1 7.2 Troubleshooting Chart 7-2 8.1 Tools for FreeStyle Service and Maintenance 8-1 Section 6.0 Typical Pressure Profiles Section 7.0 Troubleshooting Section 8.
1.0 Introduction 1.1 Equipment Provider Responsibility All Equipment Providers of the FreeStyle™ 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.
1.2 Important Notice and Symbol Explanations As you review both the FreeStyle Patient Manual and this FreeStyle Service Manual, pay special attention to the WARNING, CAUTION, and NOTE messages.
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 FreeStyle Portable Oxygen Concentrator.
1.4 FreeStyle Specifications Oxygen Concentration:* 1-3 pulse settings; equivalent to a continuous flow of 90% +5.5/-3% Oxygen Concentration Dimensions: 8.6 in. high x 6.1 in. wide x 3.6 in. deep (21.8 cm high x 15.5 cm wide x 9.1 cm deep) Weight: 4.4 lb (2.0 kg); 1.8 lb (.8 kg) optional Airbelt AC Power Supply: 100 – 240 VAC (1.0 amp at 120 VAC) Universal Power Supply: DC Power Supply: 11-16 VDC (6.0 amps max. at 13.
1.5 FreeStyle Classifications Classification 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.
2.0 Operation Check and Test of Oxygen Concentration 2.1 Description of Operation Air enters the FreeStyle Oxygen Concentrator through an external air intake / gross particle filter. This filtered air enters the compressor via a suction intake muffler that quiets the compressor’s suction sound. Pressurized air then exits the compressor and passes through a heat exchanger to reduce the temperature. Next, a two-way solenoid feed valve directs the air into one of two sieve beds that contain molecular sieve.
2.3 Alarm System An audible alarm sounds if FreeStyle has a low battery, 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. 2.3.1 Start-Up A one-second, audible alarm sounds to indicate start-up. FreeStyle begins to operate when the alarm stops. 2.3.2 Battery Status To check the level of charge of the internal battery, press the BATT button on FreeStyle’s keypad.
2.3.5 Battery Charging To check the level of charge of the battery, press the BATT button on the keypad. The battery gauge/indicator(s) illuminate to indicate the level of battery charge (25-100%). To charge the FreeStyle’s internal battery: § Connect its Universal AC or / DC (auto) power supply into the unit’s power receptacle located on the right side of the FreeStyle unit, and the other end to its proper AC or DC power outlet.
2.3.6 Battery Fully Charged When FreeStyle is connected to an AC or DC outlet and is either in operation or is off, the green 100% battery gauge/indicators displays to indicate that the battery is fully charged. 2.3.7 Cannula Disconnect (No inspiration detected) When FreeStyle is operating and does not sense breathing within 15 minutes, a red light will illuminate with a constant audible alarm.
2.4 Oxygen Concentration Test and Specification To ensure that FreeStyle’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. 1. Connect the FreeStyle Oxygen Concentrator using an AirSep-supplied Universal AC or / DC power supply only (AirSep Part No.
3.0 Patient Instructions 3.1 General Instructions It is important that patients thoroughly understand how to operate AirSep’s FreeStyle 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.
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. 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.
Lithium batteries may permanently lose capacity when exposed to extremely hot temperatures with the batteries fully charged or completely depleted. For extended storage, it is recommended that batteries be charged 25 to 50% and remain within a temperature range of 73 F (23 C) +/- 2C. Depending upon the temperature of the AirBelt 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.
3.2 Routine Maintenance by the Patient To ensure accurate output and efficient operation of the unit, the patient must perform two simple, routine maintenance tasks: 3.2.1 • Clean the air intake / gross particle filter • Contact the Equipment Provider for inspection/service when the alarm/service indicator illuminates. Cleaning the Air Intake / Gross Particle Filter The patient must clean this filter weekly, as described below.
3.2.2 Alarm/Service Indicator When the unit has reached 5,000 hours of use, a yellow LED will illuminate in the upper left hand corner of the unit’s keypad/alarm display. Instruct patients to notify the Equipment Provider when this unit alarms. 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. 3.2.3 Nasal Cannula AirSep recommends a nasal cannula with 7 ft (2.1 m) of tubing, AirSep Part No.
4.0 Equipment Provider Maintenance 4.1 No Scheduled Maintenance FreeStyle model units are maintenance-free due to their technologically advanced design. AirSep does not require preventative maintenance or service on these concentrators as long as the concentrator remains within specifications. To ensure that the unit’s output of oxygen is within specification, you must establish and implement a protocol to check oxygen concentration upon delivery to a patient and at periodic intervals (Refer to Section 2.
4.1.3 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. 4.1.4 Recording Maintenance As the Equipment Provider, you should record all routine maintenance and repairs performed on the FreeStyle unit, including hours and dates of service. 4.
Clean or replace the air intake / gross particle filter with warm soapy water between each patient’s use. The patients should be instructed to clean this filter at least once per week, depending on the environment, during normal operation. Change the product filter after 10,000 hours of use. It is not necessary to change this filter between patients even if the previous patient had a communicable disease or infection.
5.2 Housing Removal 5.2.1 Removing Front Cover 1. Place unit on its back and position the outlet nozzle upwards facing forward. 2. Locate the three screws securing the front cover (top center, lower left, and right). 3. Using a Phillips-head screwdriver, loosen, and remove the screws. (See Figure 5.1.) Figure 5.1 4. Lift off the front cover. 5.2.2 Removing Back Cover 1. Place unit on its front. 2. Locate the four screws securing the back cover. 3.
5.3 Internal Battery Replacement When removing the front cover to remove the battery, always use ESD safeguard to protect the electronic circuit board from damage. 1. Remove the front housing. 2. Carefully disconnect the 8-pin (J1) and 2-pin (J2) connector from the battery pack to the circuit board. (See Figures 5.2 and 5.3.) Figure 5.2 Figure 5.3 3. The battery pack is fastened using Velcro. To remove the pack, simply pull on battery. (See Figure 5.4.) Figure 5.4 4.
5.4 PSA Removal 1. Disconnect the FreeStyle unit from the AC or DC outlet. 2. Remove the front housing. 3. Remove the battery. Care must be taken when removing (J1) and (J2) connector. 4. Disconnect the 8-pin connector (J5) with multi-color wires from the circuit board. Care must be taken not to pull on wires. (See Figure 5.5.) Figure 5.5 5. Remove and discard foam from the top of the oval opening. (See Figure 5.6.) Figure 5.6 5-4 AirSep Corp.
The following two steps (6 and 7) require extreme caution to ensure the black pressure sensor (U3) is not damaged. 6. Remove the adjustable nozzle by gently pulling it upward until it comes out of the left side retaining clips. When the left side is out, pull the nozzle to the left to completely remove it from its cradle. (See Figure 5.7.) Figure 5.7 7. Carefully disconnect the 1/8” OD black tubing coming from the back of the unit to the limiting orifice. (See Figure 5.8.) Figure 5.8 AirSep Corp.
8. Remove the 8-32 x ¼” black Phillips screws located in the center of outlet nozzle cradle. (Figure 5.9) Figure 5.9 9. Turn unit over and remove the back housing. 10. Disconnect the black ground wire, (connected to the compressor on its upper right side near the air inlet filter) using a Phillips screwdriver. (See Figure 5.10.) Figure 5.10 5-6 AirSep Corp.
11. Disconnect the 1/8” OD black tube from the Y-connector or T connector (which is located at the back of the PSA system) that connects to the pressure transducer on the left side. 12. Remove each tie-wrap around the upper top screw bosses. (See Figure 5.11.) Figure 5.11 13. Using needle nose pliers, disconnect all the valves from the circuit board, carefully noting where each valve is connected. Do not disconnect by pulling on the wires. (See Figure 5.12.) Figure 5.12 AirSep Corp.
14. Carefully remove the complete PSA assembly from the center housing by pulling it upwards and slipping compressor molex connector through center section. (See Figure 5.13.) Figure 5.13 15. Remove the compressor plate by removing the two screws. (See Figure 5.14.) Figure 5.14 5-8 AirSep Corp.
16. Remove the two mounts from the compressor. (See Figure 5.15.) Figure 5.15 AirSep Corp.
5.5 Compressor Replacement The compressor is the “pump” within the oxygen concentrator that pushes room air into the bottom of the sieve beds. This allows oxygen to flow out the top. Over time, the cup seals wear and the compressor does not operate properly. 5.5.1 Compressor Assembly Removal 1. Remove PSA system assembly per Section 5.4. 2. Stand the PSA assembly upright and loosen the center bolt using 5/32” Allen wrench. (See Figure 5.16.) Figure 5.16 3.
4. If either of the two fittings connecting the compressor to the manifold is connected to the compressor, remove it and insert it into the manifold. (See Figure 5.18.) Figure 5.18 5. Connect the new compressor to the PSA assembly, and tighten the bolt to a torque of 15 in- lbs. (See Figure 5.19.) Figure 5.19 AirSep Corp.
5.5.2 Compressor Assembly Installation To install the new compressor assembly, perform the compressor removal procedure in reverse order. After replacing the units compressor, you must reset the hour meter, as described in section 5.11 5-12 AirSep Corp.
5.6 Product Manifold Replacement 1. Remove the PSA system per Section 5.4. 2. Disconnect the tubing assembly from the two barbs on the product manifold, mixing tank, and one end of the purge tube. (Figure 5.20 a, b, c) Figure 5.20a Figure 5.20c Figure 5.20b 3. Remove the tie wraps that bundle the solenoid value wire together. 4. Loosen and remove the center bolt from the PSA assembly using a 5/32” Allen wrench. (Figure 5.21) AirSep Corp.
Figure 5.21 5. Holding sieve beds in place, gently pull upward on the product manifold to remove. Keep tubing assembly in place. 6. Align new product manifold with the outlet of the sieve beds, and gently push manifold down into place. 7. Reconnect tubing assembly to new product manifold. 8. Place center bolt through product manifold and tighten to 15 in-lbs. (Figure 5.21) 5.7 Solenoid Valve Replacement It may not be necessary to completely remove the PSA system assembly to replace the solenoid valve.
4. Carefully disconnect the Molex connector from the circuit board by pulling on the Molex connector, not the valve wires. 5. Using a small Phillips screwdriver, remove the two screws fastening the valve. 6. Remove the valve. 7. Place gasket provided into new valve. 8. Fasten new valve using the two screws provided. 9. Re-bundle wires and tie-wrap. 10. Start FreeStyle unit and leak test around the area where the gasket is located on the valve. 5.8 Adsorbent Bed Replacement 1.
Figure 5.23 5. Remove the plugs from the top and bottom of the new adsorbent beds. 6. Place a 1.5 mm CS X 6 mm ID o-ring on the bottom cap of the adsorbent bed cap. 7. Place a 1.5 mm CS X 3.5 mm ID o-ring on the top cap of the adsorbent beds. 8. Align product manifold with the outlet on the new adsorbent beds and gently push down until the o-rings are completely seated. (Figure 5.25) Figure 5.24 9. Place center bolt through product manifold and tighten to 15 in-lbs. 5-16 AirSep Corp.
Figure 5.25 10. Reassemble FreeStyle, and leak test at bed connections. 5.9 Feed/Waste Manifold Replacement 1. Remove PSA system per Section 5.4. 2. Carefully remove tie-wraps that bundle the solenoid valve wires together. 3. Loosen and remove the center bolt from the PSA assembly using a 5/32” Allen wrench. 4. Holding both sieve beds, gently pull upward, removing the product manifold and sieve beds.
5. Remove feed/waste manifold by pulling upward on the manifold. Both fittings from the manifold to the compressor should still be connected to the manifold. If not, remove fitting(s) from the compressor. (Figure 5.27) 6. Place new feed/waste manifold onto compressor. Gently push manifold down until compressor fittings are seated into compressor head. Figure 5.27 5.10 Measuring System Pressure 1. Remove the back cover. 2.
5.11 Hour Meter Functionality General FreeStyle’s hour meter includes two monitoring channels: a historical channel that cannot be reset, and a maintenance channel ( See Figure A-1). An onboard, momentary-action pushbutton can be used to toggle the display between the two channels. While displaying the maintenance channel, the switch can be used to reset the accumulated maintenance hours to zero. Reset the hour meter at each 5,000-hour interval.
5.11.4 Toggle/Reset Switch This switch toggles the display or resets the maintenance channel depending on the activation time and the current display mode. Upon power-up, the display defaults to the historical display mode. The display will remain in historical mode until the pushbutton is used to toggle the display into maintenance mode. The hour meter will remain in this mode until toggled or until power is removed. The “h” icon will remain on and a “wrench” icon will be displayed below the “h” icon.
4. Using a small-head Phillips screwdriver remove (2) 2-56 plastic screws. (Figure 5.29) Figure 5.29 5. Gently pull upward to remove the hour meter from the 8-pin connector (J3). When removing, take care not to bend or break any pins on the J3 connector header. 6. Replace the hour meter. 5.13 Circuit Board Replacement When replacing the circuit board, always use and ESD safe work area. Also, use an ESD wrist strap to protect electronic circuitry. 1. Remove front and rear cover as per Section 5.2.
2. Remove inlet screen 3. Remove internal battery per Section 5.3 Internal Battery Replacement. 4. Remove PSA system as per Section 5.4. 5. Remove DC power input connector from location J1, pin 3 connector on circuit board. (Figure 5.30) Figure 5.30 6. Disconnect control panel/keypad flex circuit from J8 Ziff (zero insertion force) connector by carefully lifting upward on the locking tab. (Figure 5.31) Figure 5.31 7. Turn unit over so that the main circuit board is facing up. 8.
9. Remove hour meter as per Section 5.12. 10. Remove cannula nozzle tubing by cutting tie-wrap (use small-size cutter). Carefully pull tubing from nozzle barb. (Figure 5.32) Figure 5.32 11. Disconnect fan connector using needle-nose pliers, carefully pulling upward on fan connector housing at location J6 on main circuit board. Figure 5.33 12. Remove six 4-20 self-tapping plastic screws. (Figure 5.33) AirSep Corp.
Figure 5.34 13. Remove main circuit board from center section assembly. (Figure 5.35) Figure 5.35 14. Replace main circuit board; reverse order of steps 1-14. 5-24 AirSep Corp.
5.14 Motor Controller Board Replacement When replacing the motor controller circuit board, always use and ESD safe work area. Also, use an ESD wrist strap to protect electronic circuitry. 1. Lift the motor controller board from the circuit board, being careful not to break the connector pins while gently rocking it back and forth to loosen and disconnect. (Figure 5.36) Figure 5.36 2.
4. Following alignment, view the replacement board from the side at an angle to make certain that the pins are aligned properly before seating the connector. Figure 5.38 5. Gently press the board into place until properly seated. (Figure 5.38) Figure 5.39 5-26 AirSep Corp.
5.15 Control Panel/Key pad Replacement When replacing the control panel keypad, always use and ESD safe work area. Also, use an ESD wrist strap to protect electronic circuitry. 1. Remove the front and rear cover per Section 5.2. 2. Remove PSA system per Section 5.4. 3. Remove control panel/keypad flex circuit from J8 Ziff (zero insertion force) connector by carefully lifting upward on locking tab. 4.
8. Carefully align control/keypad to enclosure recessed control panel area, and press keypad evenly to ensure all adhesive is in contact with plastic surface. (Figure 5.42) Figure 5.42 9. Route the flex circuit from control panel keypad notched area of control panel enclosure section. (Figure 5.43) Figure 5.43 10. Bend flex circuit 180o, being careful not to crease or fold the flex circuit. (Figure 5.44) If creased or folded, the flex circuit will be damaged 5-28 AirSep Corp.
Figure 5.44 11. Insert flex circuit into rib section and connect flex circuit with carbon contacts facing toward you. (Figure 5.45) Figure 5.45 AirSep Corp.
12. Insert into J8 Ziff (zero insertion force) connector, making sure that the flex circuit seats into the connector. Carefully press the Ziff connector locking tab in a downward direction. Ensure latch seats. (Figure 5.46) Figure 5.46 13. Replace PSA system. 5-30 AirSep Corp.
5.16 Fan Replacement When replacing the fan, always use and ESD safe work area. Also, use an ESD wrist strap to protect electronic circuitry. 1. Remove PSA system assembly per Section 5.4. 2. Remove internal battery per Section 5.3. 3. Disconnect the Molex connector from the circuit board to the fan. (Figure 5.47) Figure 5.47 4. Remove the four Phillips screws securing the fan to the center section. (Figure 5.48) Figure 5.48 AirSep Corp.
5. When installing the new fan, be sure the arrow on the side of the fan is pointing outwards toward the front cover. This arrow indicates the direction of the airflow of the fan. Be sure the two wires coming from the fan are located on the upper left side. (Figure 5.49a, b) Figure 5.49b Figure 5.49a 6. Insert screws through each of the four corners of the fan. Secure with kep nut. Do not over tighten. 7. Connect Molex connecter to the circuit board. 5-32 AirSep Corp.
6.0 Pressure Profiles 6.1 Pressure Profile Quadrant The following pressure profiles illustrate the range of normal operating pressure at sea level. These are approximate pressures. A unit may be out of the range shown below and still be within specification, for example, in higher altitude environments. AirSep Corp.
7.0 Troubleshooting 7.1 General Troubleshooting Before reviewing the Troubleshooting Chart, the following steps may be useful to isolate any malfunctions: 1. Make sure all filters are clean. 2. Turn the unit on by pressing flow setting [ 2]. A brief, continuous alarm sounds to indicate that the FreeStyle has been turned on. The compressor will start to run, you must wait 10 seconds before proceeding to step 3. 3. Activate the test mode by pressing flow settings [1] and [ 3] simultaneously for five seconds.
7.2 Troubleshooting Chart Problem Unit does not turn on when connected to AC power outlet. Possible Cause Wall switch power is off. Solution Turn on wall or outlet switch or reset circuit breaker. No power at outlet. Universal AC or /DC Power Supply: AC power supply is not properly connected to FreeStyle. Unit does not turn on, and DC power supply is properly connected to an automobile, RV, accessory outlet. General malfunction; alarm is activated. Defective AC power supply.
Problem Possible Cause Solution Battery duration is less than per specification. Battery not fully charged. Ensure that battery charges for at least 3½ hours and all (4) LEDs are lit solid. Note: While charging, battery may not initiate a charge. Allow unit to cool to operating temperature before charging. Will initiate in approx. (20 min). Battery has been stored in a discharged or 100% charged state for prolonged period of time or stored in a very high temperature environment. Replace battery.
Problem Oxygen concentration is below specifications in test mode. Solution Unit’s temperature is too high. Blocked air intake or outlet; or defective fan. Clear any obstruction in air intake or outlet filter; or replace fan as needed. Leaks. Correct any leaks. Restriction exhaust filter. Replace exhaust filter. Defective Compressor Replace Compressor Contaminated adsorbent beds. Replace adsorbent beds. Defective solenoid valve. Replace solenoid valve. Cannula kinked or not properly connected.
8.0 Recommended Tools 8.1 Tools for FreeStyle Service and Maintenance In additional to a pressure test gauge, the following tools are generally readily available for purchase in your local area, and can assist you in servicing and maintaining the FreeStyle unit. Figure 8.1a .25-inch hexnut screwdriver and Phillips-head screwdriver Figure 8.1b 5/32-inch Allen-head driver Figure 8.1c 0-50 lb torque driver or fixed 15 lb torque driver Figure 8.
Appendix n Exploded Drawings Figure 1: FreeStyle — Internal Front View A-1 Figure 2: FreeStyle — Internal Rear View A-2 Figure 3: FreeStyle — PSA Assembly - Product Manifold A-3 Figure 4: FreeStyle — PSA Assembly - Feed/Waste Manifold A-4 AirSep Corp.
Figure A.1: Internal Front View AirSep Corp.
Figure A.2: Internal Rear View - Exploded A-2 AirSep Corp.
ITEM PART NUMBER ITEM PART NUMBER DESCRIPTION 1 BE227-1 BEDS, ASSY, MULTIPLE, 1.500” BED OD, ANNULUS, FREESTYLE 10 OR026-1 O-RING, BUNA N, 70 DURO, 1.0mm CS, 8.0mm ID, 10mm OD 2 CA232-1 CABINET, COMPRESSOR, MOUNTING PLATE, FREESTYLE 11 OR027-1 O-RING, BUNA N, 70 DURO, 1.5mm ID, 3.5mm ID 3 CO264-1 COMPRESSOR, ASSY, 1.252” BORE, FREESTYLE 12 OR027-2 O-RING, BUNA N, 70 DURO, 1.5mm ID, 6.
Figure A.4: PSA Assembly Feed / Waste A-4 AirSep Corp.
