Reduced Oxygen Breathing Device 2 (ROBD2)

Licensed from U.S. Navy under U.S. Patent Application No. 10/959.764


The Environics® Series Reduced Oxygen Breathing Device 2 is the next generation system that simulates altitude exposure and can be utilized for both research and hypoxia training. 

NOW AVAILABLE! In addition to hypoxia training, the ROBD "Hot Key" feature allows you to simulate a failure in back up emergency oxygen. This is available for all existing and new ROBD. Contact us today for more information!

Click here to order the ROBD2 through the GSA Schedule, Contract Number GS-07F-0755X.

The U. S. Military currently uses the ROBD2 to train aircrew to recognize the signs and symptoms of hypoxia and to perform the appropriate emergency procedures and additionally, conducts hypoxia research. As of 2017, the Navy will no longer use low-pressure chambers, instead using only the ROBD for hypoxia training.The Army also relies heavily on the ROBD for their re-training of crews.

Features of the ROBD2

  • A new pulse oximeter with touch screen interface
  • Enter one flow rate for all altitudes between 40 and 80 LPM
  • Breathing bag is replaced with an internal reservoir, generating a faster refresh rate to the mask.
  • Addition of an inline Oxygen filter.
  • Pulse ox probe connection moved to the rear of the chassis
  • HRT is the only program type.

Download Full Datasheet for Series 6202 (pdf)

The ROBD2 uses Thermal Mass Flow Controllers (MFC) to mix breathing air and nitrogen to produce the sea level equivalent atmospheric oxygen contents for altitudes up to 40,000 feet. The MFC's are calibrated on a primary flow standard traceable to the National Institute of Standards and Technology (NIST). The system introduces pressure changes and gas expansion as a function of altitude. Several safety features are built into the device: prevention of over pressurization of the subject's mask, prevention of reduced oxygen contents below those being requested for a particular altitude and an emergency dump switch that will supply 100% O2 to subjects. The software is menu driven.  Built-in self-tests verify all system component functionality before the operation of the system can begin. If any self-test fails the system will not operate. The system is designed to work with both bottled gases and gases produced by a Nitrogen/Air Generator (available separately).

Environics offers an optional ROBD2 Simulator Accessory Package to simplify setup of a fully integrated system.


  • 0-40,000 feet elevation
  • 21% oxygen to 4.4% oxygen
  • Integrated pulse oximeter
  • Integrated oxygen analyzer
  • Emergency Oxygen dump switch for delivery of 100% oxygen


  • Wheeled shipping case with dual handles, One-piece construction, molded from lightweight, high-impact polyethylene
  • Dual stage regulators with braided hoses
  • Additional pulse oximeter probes, sensors
  • Simulator Accessory Package


Aircrew training and research
Application Document: US Navy - Mask-On Hypoxia Training for Tactical Jet Aviators (PDF)
Application Document: Hypoxia Recognition and Recovery Training for Commercial Pilots and Cabin Crew (Powerpoint)

References in Scientific Literature
  • Clinical research
  • High altitude training and research
  • Medical stress testing
  • Hypoxia Simulator


Power Input: 110 to 240 VAC

EMI / RFI protected

Gas inputs:
Standard: 1/4" FNPT
Pressure: Nitrogen and air: 40 psig
Oxygen: 20 psig
Optional: Rear panel quick disconnect fittings with SS braided hoses and regulators
Regulator fittings

Gas input color codes
Nitrogen: CGA 580 (BLACK)
Air: CGA 346 (YELLOW)
Oxygen: CGA 540 (GREEN)

Communications: RS232

Capacity: One Subject Under Test (SUT) at a time.
Oxygen Dump: 100% oxygen dump switch to be activated by the operator.

Pulse oximeter:
Built in displays for both pulse and SpO2
User selectable alarm settings
Finger tip probe or Y sensor with ear clips
SpO2 (Oxygen Saturation)
Range: 0-100%
Accuracy: (for 1 standard deviation or 68% of sample distribution)
+/- 2% SpO2 (for 80-100% SpO2)
Display Resolution: 1%

Pulse Rate
Range: 0-300 beats per minute (bpm)
Accuracy: +/- 1% of full scale (for 1 standard deviation or 68% of sample distribution)
Display Resolution: 1 bpm

Oxygen sensor:
Range: 1 - 100% oxygen
Accuracy: Less than +/- 1.0% oxygen at constant temperature and pressure
(when calibrated in air and 100% oxygen)
Resolution: 0.1% oxygen

Output range: User programmable for altitude / oxygen concentration and duration at each step

Altitude range: 0 ft to 40,000 ft
Incremental adjustment of altitude: 1 foot
Maximum ascent/descent rate: 60,000 feet per minute
Minimum ascent/descent rate: 1 foot per minute

Breathing mask connector: MS 22058-2

Height: 12.0" (30.48 cm)
Width: 17.5" (44.45 cm)
Length: 23.5" (59.69 cm)

Weight: 55 lbs (20.4 kg)

Electrical Requirements:
Voltage: 110-240 VAC ( +/- 10%), 50/60 HZ
Power consumption: 55 watts

Performance Temperatures:
15° C to 35° C

Storage Temperature Range
-10° C to 50° C

Environics is a registered trademark of Environics Inc. Other trade names or brand names are the property of their respective holders. We hope the information given here will be helpful. It is based on data and knowledge considered to be true and accurate and is offered for the users' consideration, investigation and verification, but we do not warrant the results to be obtained. All specifications and descriptions contained herein are subject to change without notice. Please read all statements, recommendations or suggestions in conjunction with our conditions of sale which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use which would infringe any patent or copyright.