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    S9 AutoSet™ CPAP Machine

    S9 AutoSet™ CPAP Machine

    The S9 AutoSet is the premium Automatic Positive Airway Pressure (APAP) model in ResMed's S9 Series. ResMed had incorporated Easy-Breathe Technology along with an Enhanced AutoSet algorithm to make breathing through a CPAP feel more "natural". Major improvements can be seen throughout the system with advanced features like the Optional H5i with Climate Control, ClimateLine heated tubing, and on-display advanced data reporting.

    Manufactured by ResMed.

    6% of AutoCPAP Machine product buyers choose this product.

    The S9 AutoSet is the premium Automatic Positive Airway Pressure (APAP) model in ResMed's S9 Series. ResMed had incorporated Easy-Breathe Technology along with an Enhanced AutoSet algorithm to make breathing through a CPAP feel more "natural". Major improvements can be seen throughout the system with advanced features like the Optional H5i with Climate Control, ClimateLine heated tubing, and on-display advanced data reporting.

    Product Features

    The AutoSet series of Automatic Positive Airway Pressure (APAP) machines have long been designed to maximize comfort while providing minimal therapy pressures at the optimal moment. ResMed builds upon the AutoSet Advantage algorithm and incorporates EPR with Easy-Breathe technology in a new post modern shell. The S9 Series aesthetics are a complete redesign with new features:

      Key Product Features

    • Intuitive Design
    • Mask-Fit System
    • Optional Climate Control Heated Humidifier
    • SlimLine or (Optional) ClimateLine Tubing
    • AutoSet with Easy-Breathe Technology
    • Forced Oscillation Technique (FOT)
    • Expiratory Pressure Relief (EPR)
    • Smart Start / Smart Stop
    • On-Display Advanced Data Reporting
    • Optional SkinIt Cover

    Mask-Fit System

    ResMed has incorporated a simple and effective tool for help with proper mask fitting. The Mask-Fit system allows users to preset a mask type, tailoring the S9 CPAP therapy to a particular mask style:

    • Nasal
    • Pillows
    • Full Face

    Once set, the Mask-Fit system runs a 3 minute seal integrity test, prior to therapy treatment. After 3 minutes, a Mask-Fit icon appears (a green or red smiley face). If the smiley face is red, adjustments are necessary until the smiley face turns green, then therapy will begin.

    Optional Humidaire H5i Heated Humidifier with Climate Control

    ResMed has re-invented the Humidaire line of CPAP humidifiers. The Humidaire H5i incorporates an intelligent humidity controlling technology. The Climate Control system is managed through a combination of S9 machines, H5i humidifier and ClimateLine heated tubing. There are five sensors throughout the system that monitor ambient temperature and patient airflow. The ClimateLine heated tubing uses a built-in mask temperature sensor to reach relative humidity at the mask. Sensors inside and outside the CPAP machine closely monitor changes in humidity and prevents condensation from forming inside the tube. Rainout can hinder CPAP therapy and affect compliance. With the H5i humidifier, set the level of humidity and attach the ClimateLine tubing to achieve a new level of comfort.

    SlimLine and (Optional) ClimateLine Tubing

    The S9 Series CPAP machines come standard with the new ResMed SlimLine Tubing. The small diameter air tube is ultra-light, flexible and provides a unique alternative to bulky, generic 6 foot hoses. ResMed also offers a Standard Hose.

    The ClimateLine Tubing has an internal heated coil and mask temperature sensor that helps manage rainout throughout the hose. Climate Control algorithms measure temperatures from the humidifier to prevent condensation from forming. The ClimateLine Tubing can use the SlimLine Tubing Wrap to achieve total control of rainout.

    Enhanced AutoSet Advantage

    ResMed's AutoSet Advantage is the answer to providing 'just what you need, when you need it'. Pressure needs vary throughout the night. These variations depend on how deep the user is sleeping, body position, and other daily factors that can affect therapy levels. AutoSet Advantage effectively minimizes therapy and helps lower pressure-related side effects, like mouth-breathing and nasal dryness. The AutoSet Advantage has always provided a strong defense against a main types of sleeping events:

  • Flow Limitations
  • Snoring
  • Obstructive Apneas

    The Enhanced AutoSet Advantage now detects and responds to open events using an event responsive Forced Oscillation Technique (FOT). A different event response is generated when an open airway event is encountered.

    AutoSet Algorithm

    The AutoSet algorithm measures flow limitations such as snoring and apneas on a breath-by-breath basis. Therapy begins at a minimal pressure. When the user's airflow shows signs of flow limitation, the AutoSet algorithm gently increases pressure based on the intensity and duration of the event. Once the event clears, pressures gradually decrease over a 20 minute time frame. Flow limitation occurs as the upper airway begins to collapse, before snoring and apneas are detected. By gradually increasing therapy pressure, the AutoSet algorithm reacts preemptively, resulting in lower average treatment pressures.

    For example, as you sleep on your side, pressures will stay at a minimum because your airway is open. Turning on your back can collapse the airway and the AutoSet algorithm will increase the pressure. The AutoSet algorithm recognizes other conditions like sinus colds or allergies, which restrict nasal airflow. The AutoSet Advantage will increase treatment pressure accordingly, for whatever flow limitation may occur.

    AutoSet with Easy-Breathe Technology

    The S9 AutoSet uses Easy-Breathe Technology along with expiratory pressure relief (EPR) to make breathing through an APAP feel natural. At the onset of a flow limitation, the AutoSet algorithm responds with an increase of therapy pressure based on the degree of airflow restriction. Easy-Breathe technology aids in smoothing the pressure waveform during pressure increase. The process imitates normal respiration and ultimately makes breathing more comfortable than traditional CPAP machines. Easy-Breathe allows the user to receive the lowest pressure necessary to keep the airway open.

    As an added benefit, Easy-Breathe allows the S9 Series to operate at 26 dBA when set to 10cm of pressure from a distance of one meter. ResMed also managed to reduce the overall conducted noise that typically travels from the machine, through the tubing, and at the mask.

    Expiratory Pressure Relief (EPR)

    EPR decreases the pressure at the beginning of each breath and keeps the pressure low throughout the exhalation. The pressure is reduced by an exact pressure drop of one, two or three centimeters of water pressure. EPR gradually changes therapy pressures so there is little ventilatory effect. EPR also has an Event Detection Circuit. When a sleep disordered breathing event is expected or has occurred, EPR stops until the event concludes and normal breathing resumes.

    For more information on all these technologies, check out ResMed's Tech Fact Sheet.

    SmartStart / SmartStop

    SmartStart / SmartStop enables your device to start automatically by breathing into the mask. This feature automatically starts and stops your CPAP machine when you put on or take off your mask.

    On-Display Advanced Data

    There are two menus that provide users with information about compliance, therapy and machine settings: Standard Menu and Clinical Menu. Both can be reached by using the "Info" button on your machine, but the Advanced Info Menu will only appear if the machine is in its Clinical Mode.

    Standard Menu

    • Usage
    • Mask Fit
    • AHI
    • Period
    • Days Greater than 4 Hrs
    • Average Use
    • Total Used Hours

    The Advanced Menu displays all the above plus:

    • Days Used
    • Pressure
    • Leak Rate

    ResMed offers a "For Her" version of this machine. Click here to view the pink S9 AutoSet for Her CPAP Machine and H5i Heated Humidifier.

    View our CPAP Newsletter CPAP Newsletter: Understanding the S9 Line to see a detailed comparison of S9 Machines.

  • Return On Warranty Issues Only


    This Product Includes...

    • S9 AutoSet CPAP Machine
    • SlimLine Tubing
    • Carrying Case
    • Disposable Filter
    • Patient Manual
    • SD Memory Card
    • Power Supply and Cord

    Product Specifications

    Pressure: 4 to 20 cm H2O (.2 increments)

    Ramp Time: 0 to 45 min. (5-min. increments)

    Starting Ramp Pressure: 4 to min pressure

    Dimensions: 6 in x 5.5 in x 3.25 in

    Bag Dimensions - Outside: 13.5 in x 12 in x 5.5 in

    Machine Weight: 1.79lbs

    Filters: Pollen or Hypoallergenic

    Sound Level: 26 dBA

    Operating Altitude: Sea level to 8500' (2591 m)

    SlimLine Air Tubing: Flexible plastic, 1.83m, 15mm inner diameter

    Optional ClimateLine Tubing Length: 78 inches

    Optional ClimateLine MAX Tubing Length: 75 inches

    Housing Construction: Flame retardant thermoplastic

    Device Set-Up: Push Dial

    Available Languages: English (Default), French, Spanish, Portugese

    Humidification: Optional Integrated Heated Humidifier or Pass-over Humidifier

    DC Power: Only use DC Converter by ResMed for DC input or damage may occur.

    Warranty: 2 Year Manufacturer

    90W Power Supply:

    • Dimensions of Power Supply Only - Not including Cord or Plug: 5 1/2 inch (L) x 1 7/8 inch (W) x 1 1/4 inch (D)
    • Weight of Power Supply, Cord & Plug: 1.29 Pounds
    • Unit Input Range 100-240V, 50-60Hz,
    • Nominal for Aircraft Use 110V, 400Hz
    • Typical Power Consumption 70W (80VA)
    • Maximum Power Consumption 110W (120VA)

    European Voltage Usage: Yes, outlet adapters required

    Data Storage Capacity:

    • Display: 365 days summary data (up to 500 events per session.)
    • SD Memory Card: 365 days summary data and 30 Days and 7 nights detailed data

    Aircraft Use:

    These S9 devices comply with US FFC Part 15, Class B requirements if no external data cables are used.

    Max Exposure Heat for Machine:

    Machine should not be exposed to heat greater than 140 degrees Fahrenheit

    Required Settings: This machine does not have required settings.

    Unless directed otherwise, will leave this machine at its default settings of:

    • EPR: Off
    • Ramp: On
    • Ramp Time: 20 Minutes
    • Ramp Start: 4 cm H2O always offers these services:

    • 8 am to 10 pm CST Toll Free Phone and Email Support
    • 24 hour access to our Support Forum
    • Learning Center for information on sleep apnea and cpap equipment
    • Consumer Purchasing Trends Reports
    • Warranty Services for all items purchased through
    • Insurance Compliant Invoices
    • Free Prescription Request System

    Manufacturer Note

    • Some product images supplied by ResMed © ResMed 2010 Used with Permission.
    • ResMed products are for sale only to patients within the U.S. and not to other third parties or businesses.
    • A valid prescription is required for the purchase of this product.
    • All services provided by, including advertisement, ordering, sale, delivery, instruction, and setup of the products are performed solely by and independently of the manufacturer.

    Important Tips

    Deciding which S9 Machine to Choose

    To see a detailed comparison of the different S9 CPAP machines by features, please see our CPAP Newsletter: Understanding the S9 Line.

    Compatible Hoses

    The S9 line of machines come with SlimLine hosing which has a 15mm diameter. A standard (22mm) hose can be used with the S9 machines, however the Patient Setup Menu must be accessed and the "Tube" setting changed from "Slim" to "Standard". If a ClimateLine hose is attached this setting is automatically changed accordingly.

    Power Supply

    The S9 Series can use (2) different Power Supply units, a 30 Watt or 90 Watt external brick. S9 machines come standard with a 90 Watt Power Supply that can power the CPAP machine and Humidifier. The 30 Watt Power Supply will only operate the CPAP machine and the humidifier will act as a passover.

    The DC Converter 24V/90W For S9 Machines allows this machine to be used with battery power.

    The S9 Series now can use the ResMed hypoallergenic air filter. The filter is made from non-woven acrylic and polypropylene fibers with a polypropylene carrier.

    For help understanding how AutoSet with Easy-Breathe works, click on AutoSet with Easy-Breathe Tech Fact Sheet.

    For help with setting up the S9 Series, click on the S9 Elite and AutoSet Welcome Guide.

    Humidaire Cool Down Feature

    All S9 Series machines utilize a "Cool Down" feature that runs the CPAP Motor up to 1 hour after turning the machine off. The motor helps to cool off the humidifier plate. You may hear a "faint blowing sound" when you turn the machine off. However, you can unplug the power cord and allow the heater plate to cool without airflow.

    H5i Humidification Level

    The H5i Heated Humidifier has three modes: Patient, Auto and OFF. These settings can be accessed under “Climate Control” through the Clinical Menu.

    When the H5i is set in Auto mode it will measure the amount of humidity in the room and heat only as much as needed to reach the optimal moisture level of 80% and then stop heating and go into a cool down mode. When the H5i again senses the need to raise the humidity to 80% it will begin to heat.

    When the H5i is set in Patient mode it will heat in the traditional manner until it reaches the desired setting of humidity or 80%. The H5i can be set from OFF to 6 and is adjusted from the HOME screen.

    The maximum level of humidification is 80% whether using the SlimLine of ClimiteLine Tubing.

    ClimateLine Tubing Information and Use:

    • Tubing Options: ResMed's S9 AutoSet CPAP has a number of tubing options. The SlimLine 15mm tube is a non-heated tube in a thin, flexible style. The machine can also be used with an OPTIONAL heated ClimateLine Tubing which integrates with the machine and OPTIONAL H5i Heated Humidifier to provide increased humidification and reduced chances of rainout. The ClimateLine is available in two diameters. The SlimLine 15mm ClimateLine Tubing and a standard diameter 19mm ClimateLine Max Tubing. Additionally a standard diameter, non-heated tube may be used.

    • ClimateLine Tubing Lengths: A traditional CPAP tube is 72 inches long. The optional 15mm ClimateLine Tubing length is 78 inches. The optional 19mm ClimateLine MAX Tubing length is 75 inches.

    • Installation of the ClimateLine: The ClimateLine attaches to the back of the machine using the same port as a standard hose. The electronics connection is below the port and may be covered with a protective flexible rubber cap attached the machine. Place the machine so the back of the unit housing the filter and hose connection is facing you. After removing the rubber cap, orient the hose so the electronic tab is facing toward the filter. Push the tubing end firmly onto the port, then rotate the tube clockwise to fit the two electronic connections together.

    • Removing the ClimateLine: To remove the ClimateLine from the back of the machine, rotate the hose counter clockwise. The electronic connections disengage allowing the hose to removed. Cover the machine's electronic port with the flexible rubber cap to protect the connections.

    ClimateLine Tubing Lengths

    A traditional CPAP tube is 72 inches long. The optional ClimateLine Tubing length is 78 inches. The optional ClimateLine MAX tubing length is 75 inches.

    Please Note: If an O2 Enrichment Adapter is used with the ClimateLine Heated Tubing for the S9 Series of CPAP machines, the O2 Enrichment Adapter must be placed between the ClimateLine tubing and the mask instead of between the S9 Humidifier and the hose, in order for the ClimateLine tubing to work correctly.

    SmartStart Note

    Per the manufacturer, the SmartStart auto on / off feature of this machine may not function as intended when used with a nasal pillow mask and a pressure setting of 7 cm H2O or less. If this feature does not appear to be functioning with this type of mask and pressure setting, this comfort feature can be turned off. Please refer to the User Guide for more information.

    Manufacturer Warranty
    This machine comes with a 2 Year Manufacturer Warranty. will work with the manufacturer on your behalf if the machine needs repairs. Please follow these steps:

    • Contact us at or 1-800-356-5221 to receive an RMA (Return Merchandise Authorization) Number before returning the equipment
    • Include a note with the machine describing the issue you are experiencing, along with your full contact information to include a return shipping address and the RMA number provided to you
    • Ship only the defective items to at 13235 N Promenade Blvd Stafford, TX 77477
    • Do not return accessory items such as the carry bag, hose or power cords
    • Loaner Machines are available for rental during the warranty process
    • Email updates will be sent to keep you informed as the machine moves through the warranty process
    • will contact the manufacturer on your behalf and handle all shipping between us and the manufacturer
    • The repaired or replaced unit will be returned to you. Shipping charges may apply.

    Please note: The manufacturer warranty is voided by water damage or misuse of the machine.

    CPAP Power Options

    Battery Power for S9 AutoSet

    The following information is applicable for the ResMed S9 AutoSet alone or with a heated humidifier. Keep in mind that using a heated humidifier will reduce the run time of the battery by approximately one half.

    DC Converter 24V/90W For S9 Machines

    The DC Converter 24V/90W For S9 Machines is required to use the following machines with DC power directly from a battery:

    Failure to use the ResMed DC Converter 24V/90W For S9 Machines can result in damage to your CPAP.

    DC Converter 24V/90W For S9 Machines may be used with the Respironics Battery Pack (No DC Cable).

    ResMed Power Station II Battery Kit for S9™ Machines

    The ResMed Power Station II is a battery kit made specifically for S9 machines. This battery kit includes all necessary components to connect to a S9 machine. It can be used with all S9 Series machines, and the battery is charged with the S9 power supply and cord. The battery can be used during travel or at home as a battery back up if electricity is lost.

    The battery has an estimated run time of 13 hours with an S9 machine set at 10 cmwp without a heated humidifier. Please note the addition of a heated humidifier will greatly reduce the run time of the battery. Please reference the ResMed Battery/Device List for more information on Battery Run Time.

    Respironics Battery Kit for S9 Machines

    This external lead acid battery pack is the ultimate in power, portability and convenience. This battery pack is a great option to have on hand to power the S9 AutoSet™ CPAP Machine in the event of a power outage. This battery kit comes with the Respironics Battery Pack and the DC Converter 24V 90W For S9™ Machines.