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Sandman Duo ST BiLevel CPAP Machine with Built In Heated Humidifier

BY Puritan Bennett  |  Item #M-114824-US
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Sandman Duo ST BiLevel CPAP Machine

The Sandman Duo ST is lightweight, compact and user-friendly. The Duo ST BiLevel features an intelligent pressure stability and respiratory events detection system that reacts to an obstruction event. Also, the Sandman Series includes the humidifier technology called HumidControl. The built in humidifier actually measures the temperature outside the chamber and adjusts the heater plate to minimize condensation. At 2.64 pounds, take the Sandman Duo anywhere and feel confident you will receive effective therapy.

Sandman Duo ST BiLevel CPAP Machine

The Sandman Duo ST is lightweight, compact and user-friendly. The Duo ST BiLevel features an intelligent pressure stability and respiratory events detection system that reacts to an obstruction event. Also, the Sandman Series includes the humidifier technology called HumidControl. The built in humidifier actually measures the temperature outside the chamber and adjusts the heater plate to minimize condensation. At 2.64 pounds, take the Sandman Duo anywhere and feel confident you will receive effective therapy.

Learn More About Your New Machine

The Sandman Duo ST BiLevel machine is designed to provide accurate therapy pressure using an advanced Adaptive Pressure Stability system that helps in detecting respiratory events. The Duo ST is equipped with pressure and flow sensors that detect apneas, hypopneas, inspiratory flow limitations and snoring. Once an event occurs, the machine reacts using an enhanced algorithm that smoothly adjusts the pressure during events.

The Duo ST allows BiLevel users to set a backup frequency, I/E ratio and pressure rise time. Use the I/E ratio to set the time between inhalation and exhalation. As an alternative, set the Duo ST to CPAP mode and turn on Pressure Alter feature which allows users to adjust their pressure up or down 1cmH20 without going into Clinical Mode.

The Sandman Series uses Covidien's unique Adaptive Pressure Stability (APS) technology that limits the peak to peak variations of CPAP pressure when a user breathes. Adaptive Pressure Stability responds quickly and accurately to several common conditions that result in changes from your prescribed pressure down to each breath.

Common conditions affecting Pressure
  • Switching Masks
  • Mask leaks
  • Altitude
  • Natural respiratory effort
  • Barometric pressure
  • Sleep stage
  • Body position


Each patient is different and Covidien has created FlowSens technology that allows you to adjust the machine's sensitivity along with setting the rise time. Allowing you to adjust the Sandman Duo ST to match your apnea needs.

True Circuit Calibration helps the Sandman Duo ST compensate for pressure variances created when using different styles of masks and tubing. For instance, when using a Full Face Mask, a digital signal processor microcontroller helps to improve flow generation capabilities, delivering an accurate pressure at the mask.

The Sandman Duo ST records compliance data which allows a digital signal processor to work interactively with the user and provides accurate flow control. For advanced therapy effectiveness, use the Sandman Therapy Software to help visualize user sessions and take control of your sleep therapy.

The device is quiet, discreet and user-friendly. Small and light, traveling with the Sandman is convenient. Use either AC or DC power from an external battery source. If altitude is an issue, the Auto Altitude Compensation feature accounts for barometric changes. All Sandman CPAP units contain an advanced pressure transducer that compensates for altitudes up to 9,000 feet, which could effect your cpap as much as 3cmH2o of pressure.

Covidien also addresses the need for humidity, incorporating a built-in heated humidifier, together weighing only 2.75 pounds. The humidifier is located to the rear of the CPAP with a water chamber that is easy to clean. Using a new technology, HumidControl, the humidifier provides the best temperature according to the relative humidity outside the water chamber. This prevents water from collecting in the CPAP hose and keeps the humidification level constant throughout the night.

Features
  • Adaptive Pressure Stability
  • True Circuit Calibration
  • Digital Signal Processor
  • FlowSens Technology
  • Spontaneous Timing
  • Extensive Compliance Data
  • AC or DC Power Compatible
  • Leak Compensation
  • Auto Altitude Adjust
  • LCD back-lit Display
  • Rear-routed tubing
  • Built-In Humidifier
  • HumidControl Technology
  • Parts Replacement Reminders
  • Memory Card and Optional Software

Sound Level: 26 dB

Machine Weight: 2.75

Machine Warranty: 2 Years

Default Machine Settings: 4-25cm H2O

Humidification Available: Yes

Humidification Type: Built-In

Ramp Mode: Yes

DC Capable: Yes

Battery Option: Yes

Auto Altitude Adjustment: Yes

Good For: [object Object]

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  • 24 hour access to our CPAPtalk.com Support Forum
  • Learning Center for information on sleep apnea and cpap equipment
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  • Warranty Services for all items purchased through CPAP.com
  • Insurance Compliant Invoices
  • Free Prescription Request System

User Manual:

The user manual included with this machine can be viewed and downloaded here: Sandman User Guide.

Manufacturer Warranty
This machine comes with a 2 Year Manufacturer Warranty. CPAP.com will work with the manufacturer on your behalf if the machine needs repairs. Please follow these steps:
  • Contact us at cpap@cpap.com 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 CPAP.com at 13235 N Promenade Blvd Stafford, TX 77477
  • Do not return accessory items such as the carry bag, hose or power cords
  • Email updates will be sent to keep you informed as the machine moves through the warranty process
  • CPAP.com 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.
360
Universal Power

This system operates automatically between 110v and 240v AC. When traveling either inside or outside the USA, there are no switches to switch or fuses to change. The machine will automatically sense what voltage is needed and set itself to run on that power.

The user will need to adapt the plug that goes into the wall to fit the style of outlet socket that is being used. This is simply done with a Power Adapter Plug kit. This is the same type of plug adapter that would be used with a hair dryer or an electric shaver. World Traveler Power Adapter Plugs.

Universal 12 Volt DC Power Cord

This machine come equipped with a DC plug on the back of the unit. This allows the user to connect the CPAP to an external DC battery source. The IntelliPAP can be powered by plugging the 12volt DC Power Cord into a cigarette lighter plug. This is ideal for traveling by car, boat, or recreational vehicle that is equipped with a cigarette lighter plug.

CPAP.com Battery Kit with Universal 12 Volt DC Cable

The 2.5 lb CPAP.com Battery Pack is surprisingly small and lightweight. The lithium ion battery can be recharged at any discharge level without losing charge time due to battery memory loss. This battery has been approved by the United Nations and Department of Transportation as tested safe for travel. This battery kit comes with the CPAP.com battery and the 12 Volt DC Power Cord.

Respironics Battery Kit with Universal 12 Volt DC Cable

This portable battery pack is an external lead acid battery that is the ultimate in power, portability and convenience. This battery kit comes with the Respironics battery and the 12 Volt DC Power Cord (connects CPAP to cigarette lighter socket).
What is the difference BiPAP and BiPAP ST?
A BiPAP (also referred to as a BiLevel or VPAP) delivers two set pressures, a higher pressure for inhalation and a lower pressure for exhalation.

BiPAP and BiPAP ST machines are similar, as they are both designed to provide the same airway pressure. The difference between a BiPAP and a BiPAP ST is the Spontaneous Timed feature. The ST responds to the user when the minimum number of breaths per minute has not been met. This machine ensures all breaths occur by triggering the user to take another breath within the minute.

For example, a BiPAP might be set at the following:
  • Inhalation Pressure - 10
  • Exhalation Pressure - 5
In this case, a BiPAP will provide an IPAP of 10 and EPAP of 5.

A BiPAP ST might be set at the following:
  • Inhalation Pressure - 10
  • Exhalation Pressure - 5
  • 12 BPM (Breath Per Minute)
Similarly to the regular BiPAP, the BiPAP ST will provide an IPAP of 10 and EPAP of 5, and will additionally monitor if you inhale 12 times within the minute. Please Note: The ST will not breathe for you, rather it will prompt the user to take a breath.
How do I choose the machine that is right for me?
We provide our customers with many tools to make informed decisions about their machine purchases. Options include:
How can I compare different machines?
We work very hard to provide many different ways for our customers to compare products. Here are the machine product guides we have created and maintain:
  • CPAP Machine Comparison Guide. This guide stacks up every CPAP machine we sell, feature by feature. If you don't know the meaning of a feature, click the question mark for a definition. The links below will take you to the most popular CPAPs, or all CPAP machines we sell.

    Compare Most Popular CPAP Machines

    Compare All CPAP Machines

  • Auto Adjusting Machine (APAP) Comparison Guide. This guide stacks up every APAP machine we sell, feature by feature. If you don't know the meaning of a feature, click the question mark for a definition. The links below will take you to the most popular APAPs, or all APAP machines we sell.

    Compare Most Popular APAP Machines

    Compare All APAP Machines

  • BiPAP, VPAP and BiLevel Comparison Guide. This guide stacks up every BiPAP machine we sell, feature by feature. If you don't know the meaning of a feature, click the question mark for a definition. The links below will take you to the most popular BiPAPs, or all BiPAP machines we sell.

    Compare Most Popular BiPAP Machines

    Compare All BiPAP Machines
What comes with my machine?
Machines come with a six foot hose, power cord, at least one filter, and manuals. Most manufacturers include a carrying case which is designed specifically for their equipment. CPAP, APAP, and BiPAP machines do not come with a delivery system or mask. CPAP masks must be purchased separately.

To see the list of what specifically comes with each machine, you can Browse for a machine. Then on the product page, click the "Specs" tab to see a full list of what comes with the machine.

Which CPAP masks work on which machines?

Any mask will work with any machine, with one important exception. The ResMed AirMini is only compatible with certain ResMed CPAP masks. Compatible masks for the AirMini are as follows:

  • ResMed AirFit™ N20 Nasal Mask
  • ResMed AirFit™ F20 Full Face
  • ResMed AirTouch™ F20 Full Face
  • ResMed AirFit™ P10 Nasal Pillow

When considering another CPAP, APAP or BiPAP machine from ResMed or any other manufacturer, mask compatibility extends to all brands. The AirMini uses non-standard tubing to connect the machine to the mask, and is the primary reason why other masks won't work with the AirMini. Despite this issue, many of our customers consider the AirMini to be an excellent machine.

Are prescriptions required for mask, machine, humidifier, and EPAP purchases?

Yes. Federal law requires we have a valid prescription on file before we ship your mask, machine, humidifier, or EPAP therapy, including Provent and Bongo RX. You will also need a prescription to purchase the Nightbalance POSA device.


We provide many easy ways to get your prescription:

  • We can request your prescription for you! When you checkout, just let us know you would like us to request your prescription, or you can log into your account to have us request your prescription.
  • Fax your prescription to our toll-free fax number: 866.353.2727, or our international fax number: 713.541.7377
  • Email your prescription to cpap@cpap.com
  • Upload your prescription in your account, under the Prescriptions Section
  • Ask your doctor to fill out our prescription form. We have both a standard prescription form and an EPAP prescription form.


For more information on prescriptions, please see our Prescription Section of the Learning Center.


What does a BiPAP ST prescription need to say?
A BiPAP ST prescription must contain all of the following information:
  • One of the following words or phrases: "BiPAP ST", "Synchrony ST", "VPAP ST"
  • Your physician's contact information
  • Your physician's signature
  • The patient's full name
  • A backup rate or BPM setting.
  • Your inspiration pressure (Also called IPAP or breathing in pressure)
    • Example: IPAP 13 CM/H20
    • Example: IPAP 13
    • Example: IPAP 4 CM/H20
    • Example: IPAP 4
  • Your expiration pressure (Also called EPAP or breathing out pressure)
    • Example: EPAP 13 CM/H20
    • Example: EPAP 13
    • Example: EPAP 18 CM/H2O
    • Example: EPAP 18
What is exhalation relief?
Exhalation relief is a comfort feature which reduces the air flow at the time of exhalation, making the breathing process more natural.

The following are the different types of exhalation relief names by manufacturer.

  • Philips Respironics = C-Flex, C-Flex+, A-Flex and Bi-Flex
  • Resmed = EPR (Expiratory Pressure Relief)
  • 3B Medical = RESlex
  • Apex Medical = PVA (Pressure Variation Algorithm) Pressure Relief
  • Curative Medical = EUT (Expiratory Unloading Technology)
  • DeVilbiss = SmartFlex
  • Fisher & Paykel = SensAwake Technology
  • Human Design Medical = Z-Breathe
  • Somnetics = EZEX

Here are some machines with an exhalation relief feature:

Transcend Auto miniCPAP™ Machine with EZEX
PR System One REMStar 60 Series Auto with Bluetooth
AirSense™ 10 AutoSet CPAP Machine with HumidAir™ Heated Humidifier
+ See More
What maintenance is required on machines?
The only care a CPAP, APAP or BiPAP machine requires is to clean or change the filters at the air intake. This keeps the internal parts from accumulating dust. Fine paper filters should be changed out every 30 days, or when they appear soiled. Foam washable filters should be rinsed with clear running water once a week, allowed to air dry, and reinserted.

Here are some other suggested actions to care for your machine:
  • Keep the area around your machine clean by removing any dust from the area to improve the air quality delivered to your machine and to you.
  • Keep the air intake of the machine unblocked. Curtains, bedding, and papers can easily block the air intake of your machine, reducing the airflow.
  • If a humidifier is used with your therapy, do not pick up the machine with the humidifier attached. With most machines it is easy to spill water from the humidifier chamber into the machine causing damage. Manufacturer warranties are voided by water damage to the machine. To avoid this, remove the chamber from the humidifier and then remove the humidifier from the machine rather than transporting them together.
  • If a humidifier is used, empty the water from the chamber every morning. Accidents happen. If a family pet or family member moves the machine and humidifier with water in the chamber it is more likely that water could be spilled into your machine. Water damage to a machine voids the manufacturer warranty.
How do I use a battery to operate my CPAP?

All machines can connect to DC power. Some machines are configured to operate on DC Power and have a DC power outlet. Other machines require AC power and will need an Inverter that turns DC power to AC power.


Having the proper equipment is the biggest key to successfully operating the machine from a battery. For example, if your machine does have a DC outlet and you want to run your machine from a marine battery, be sure to get the correct DC cable for the machine, as well as an adapter cable with alligator clips that fits over the cigarette lighter plug.


CPAP.com sells complete battery kits with everything you need for many machines including the correct cables for those machines and batteries. If you have questions about the specific power needs of your machine, review the 'Power' tab found on the machine's product page, or give us a call at 1-800-356-5221.

CPAP.com 100% Price Protection Guarantee

When you shop with us, we want you to be confident that you are receiving the best available price. If this items goes on sale or you spot an online or retail competitor with a lower price within seven days of your purchase, let us know, and we will credit you the difference.

"Super helpful, fast shipping, friendly assistance, great selection, I love this company."

- Verified Customer, 10/25/22

★★★★★

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Manufacturer
Puritan Bennett
ResMed
ResMed
Warranty
2 Years
2 Years
Sound Level
26 dB
26.6 dBA
Quiet
-
-
Yes

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★★★★★

Verified purchase | May. 18, 2010 | Verified CPAP.com Customer
compact,quiet,easy to use
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★★★★★

Great Machine, LOVE this humidifier!

Verified purchase | Sep. 26, 2009 | Verified CPAP.com Customer
I used another manufacturer’s Auto-titrating BiPAP for years to treat my complex apnea (both obstructive and central apnea). I had failed CPAP testing in the hospital sleep lab because I was unable to exhale against sufficient pressure to minimize my obstructive apneas, so we went to the auto-titrating BiPAP to resolve my apneas, and my min EP and max IP pressures were determined. Synchronization combined with auto-titration seemed to resolve my central apneas by forcing progressively harder puffs of air — the only drawback was in this process the machine would often “run away” and go all the way to the machines max pressure of 25 and stay there. As a result, I would wake with the mask blasting air everywhere and I not able to breathe against it. The only resolution was to turn the machine off and back on. I purchased the Sandman Duo ST machine because of the very small and light size of the machine, the description of the “adaptive algorithm” in the machine, and the synchronization feature. It would be much more convenient for travel, and seemed it would possibly resolve issues I had with my previous machine. First, this is NOT an auto-titrating machine, as I had believed from the description of the “adaptive algorithm. Thus, because my pressures were determined as min/max auto-titration, the settings in the Sandman when I received it were way off. Fixed EP/IP pressures were not determined during my sleep study. I could not breathe with these settings, and short of a new hospital sleep study, trial and error were necessary to find pressures that promote good sleep. Are they the “correct” pressures? Neither my doctor nor I can really tell given the limited data the software provides. That said, with this machine I am sleeping very well. I turn frequently during the night and my respiratory rate changes significantly with position and other factors. Though breathing is fully synchronized by the machine, the sensitivity is such that the second I “exhale against the inflow,” the machine switches to exhalation and resynchronizes. My partner reports that I do not snore and, more important, don’t seem to have uncorrected central apnea episodes. Bottom line is that once the pressures and other settings were determined, this very compact machine really does the job. Another real plus is that I have always had to use the humidifiers on previous machines only in pass-over mode. Even on a heat setting of 1, I experienced drown-out. With this machine, I am able to set humidification level where I need it, currently at 4, and experience no drown-out. The humidity sensor really works. Going from an auto-titrating machine with only min/max titrated pressures to a fixed-pressure BiPAP was quite difficult, and gave a bad first impression of the Sandman. Had I had a prescription with correct pressures for this type of BiPAP in the beginning, I would have immediately known this machine is a champion. With correct settings now in the Sandman, I have given up all thoughts of going back to my auto-titrating machine.
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★★★★★

Excellent Machine

Verified purchase | Jul. 27, 2009 | Verified CPAP.com Customer
Received my Sandman Duo ST BiLevel CPAP Machine a few days ago. It was easy to setup and operate. The machine operates perfectly giving me a restful sleep for the first time in many years. I live overseas and the machine arrived 6-days after ordering. I was able to track the progress of the shipment via UPS and was able to call UPS for a last minute change of delivery as it was arriving on the weekend when my office was closed. It was rerouted to my home so I could use it immediately. Thanks all for the speedy order and delivery.
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