Description

Description

Closed Circuit Breathing Apparatus - PSS BG-4 Plus, 4-hour Positive Pressure with Sentinel II | Dräger

Dräger PSS® BG 4 plus

Specially designed for demanding tasks, The Dräger PSS® BG 4 plus closed-circuit breathing apparatus combines uncompromising safety with outstanding respiratory protection and wearer comfort. Innovative in design, it provides the wearer with up to four hours of breathing gas in toxic environments.

Dräger PSS BG 4 plus
Whenever emergency teams are saving lives or extinguishing fires, above or below the ground, the Dräger PSS BG 4 plus comes into its own. Whether used during rescue or fire fighting missions in mines, tunnels or underground train ducts, or in assignments with long access routes, the closed-circuit breathing apparatus is the first choice. More than 25,000 professional users rely on the Dräger PSS BG 4 worldwide.

Optimized in conjunction with our customers
Our products must meet the precise needs of the user and, for this reason, we involve our customers in the development process. Modifications to the proven Dräger PSS BG 4 are the result of practical experience and constant monitoring to ensure the highest quality standards. We listened to our customers and implemented their requirements in the new Dräger PSS BG 4 plus. Numerous improvements and new accessories have increased safety and durability and further improved the ease of servicing. The modifications are available individually or a as a practical retrofit set upon request.

Excellent suitability for extended use
The slight positive pressure breathing circuit protects the wearer by preventing hazardous substances from entering the sealed breathing system. Depending on the application, the duration of use is up to four hours. A CO2 absorber removes carbon dioxide from the exhaled gas. At the same time the breathing gas is enriched with oxygen from the oxygen cylinder. Before the regenerated breathing gas is inhaled again it flows through the cooler.

Product enhancements
Both the minimum valve, which enriches the breathing gas with additional oxygen upon demand, and its attachment clip have been treated with a special coating to protect against corrosion. A redesigned clip simplifies the fitting of the valve. The area around the pressure reducer has been reinforced and additional reinforcement protects the carrying plate, providing greater stability when handling the unit complete with oxygen cylinder. To reduce the temperature of the inhaled gas and minimize physical stress to the wearer, the cooler can be filled with ice.

Practice-oriented innovations
Newly developed heat protection for the breathing hose and housing are also optionally available to further reduce the temperature of the inhaled gas. A T-piece with water trap can be retrofitted to the facemask to prevent water from collecting in the flow area of the device. Any liquid discharged into the breathing circuit from the drain valve is optionally collected in a super absorbent fleece. The fleece is designed for single use and is easily disposed.

Simple CO2 disposal
Complete with integral dust filter, the flow-sensitive CO2 absorber is available as either a single-use absorber or refillable cartridge. Fitted with a newly designed spring clip, the CO2 absorber offers increased spring durability. The position and size of the breathing hose connectors have also been optimized for easier handling during assembly. For hygienic storage the single-use absorbers are available in a sealed bag.

Proven wearer comfort
?The ergonomically shaped carrying plate, the low weight and the proven harness with adjustable shoulder straps and easy to use "pull-forward" design provide more freedom of movement with less effort. The practical breathing hose routing across the shoulders ensures optimum balance on the wearers back.

All functions upon a glance
The Dräger PSS BG 4 plus is equipped with the Dräger Sentinel II fully electronic signal and warning unit. Controlled via large push buttons, it combines a multitude of functions. During use it quickly provides the wearer with important information, thereby reducing the risk potential. Using battery warning thresholds the Dräger Sentinal II reliably indicates current operational status.

Monitoring functions:

Cylinder pressure (analog and digital)
Remaining duration of use (time remaining until residual pressure warning)
Temperature indication upon the press of a button
Automatic recording of all mission data optical and acoustic warning signals:
Optical and acoustic warning signals:

Residual pressure warning
Two additional selectable electronic alarm thresholds
Automatic alarm for lack of movement
Manual emergency call alarm

High performance soda lime
Drägersorb 400 has been specially designed for the absorption of CO2 in closed-circuit breathing apparatus which significantly contributes to long-term performance capabilities, especially under the likely conditions of use for the Dräger PSS BG 4 plus. Drägersorb 400 is characterized by a very high abrasion resistance and can, therefore, be used in the apparatus for 6 months, or up to 300 miles when stored in a vehicle.

Easy maintenance
?Both the retrofittable vibration protection and the robustly designed locking hinge increase the safety of the Dräger PSS BG 4 plus during transportation. For maximum operational readiness, the Dräger PSS BG 4 plus has been designed to allow the fast assembly and/or removal of device components without special tools.

The full-face mask Dräger FPS 7000 RP
The full-face mask Dräger FPS 7000 ideally complements the Dräger Panorama Nova product family. With an improved head harness and available in various sizes, it adjusts perfectly to every face shape. With its dual sealing line, the almost natural field of view and easy-to-operate wiper, the FPS 7000 RP ensures a safe tight fit and good all-around visibility. An optional adapter enables the connection of the comfortable CamelBak* drinking system. Liquid only flows through the straw when the integrated biting valve is pressed together by the teeth.

*CamelBak® is a trademark of Camelbak Products, LLC.

More Info

Closed Circuit Breathing Apparatus for Extended Hazardous Atmospheres

Firefighters, mine rescue technicians, and confined-space teams working in underground and hazardous atmospheres rely on the PSS BG 4 plus Closed Circuit Breathing Apparatus to provide up to four hours of breathable gas during extended operations.

Industry Applications and Professional Use

Emergency Services Work Environments

Firefighters and emergency responders typically use the PSS BG 4 plus during long-duration rescue and fire fighting where extended air supply and mission data logging help manage complex incidents.

Mining Work Environments

Mine rescue technicians commonly deploy this closed-circuit rebreather in underground shafts and long-access rescues where the 4-hour positive pressure capability and Drägersorb 400 CO2 absorber support prolonged missions.

Transportation (Underground/Rail) Work Environments

Tunnel and subway crews often depend on the unit for long access-route incidents because Sentinel II records mission data and provides analog and digital pressure monitoring for situational awareness.

Utilities Work Environments

Confined-space entry teams in utilities typically use the apparatus for maintenance in vaults and manholes where low-weight ergonomics and cooler/thermal management reduce wearer strain.

Municipal Services Work Environments

Municipal rescue and hazmat teams often choose the PSS BG 4 plus for planned and unplanned incidents requiring closed-circuit operation and reliable CO2 absorption performance.

Technical Specifications and Product Features

Understanding Product Standards

Technical features matter for closed-circuit breathing apparatus because they influence duration, wearer comfort, and operational monitoring during complex responses.

What does positive pressure mean?

Positive pressure in a closed-circuit system means the breathing loop maintains slightly higher internal pressure than the ambient atmosphere to reduce ingress of contaminants into the circuit.

Specification	What It Means	Practical Benefit
PSS BG 4 plus — 4-hour duration	Manufacturer-rated operational time under specified conditions.	Supports extended operations in mines, tunnels, and long access rescues.
Sentinel II electronic signal and warning unit	Analog and digital cylinder pressure, remaining duration, temperature, mission data logging and alarms.	Gives wearers and incident commanders clear runtime and status information for better decision making.
Drägersorb 400 CO2 absorber	High-performance soda lime cartridge available single-use or refillable.	Enhances CO2 absorption life and abrasion resistance for long-duration missions.
Cooler, ergonomic carrying plate, FPS 7000 RP compatibility	Thermal management, adjustable harness and full-face mask integration.	Improves wearer comfort, balance, and mask fit during prolonged use.

Use Case Scenarios and Applications

Indoor Confined-Space Operations

The PSS BG 4 plus typically performs in confined-space entry where teams need a closed-circuit rebreather to limit gas consumption and manage CO2 with Drägersorb 400.

Underground and Tunnel Rescue

In long-access tunnel or subway incidents, responders commonly rely on Sentinel II mission data logging and pressure monitoring to coordinate rotations and track remaining duration.

Large-Scale Incident Response

Incident commanders often deploy multiple units for sustained operations where ergonomic harnesses, cooler options, and optional heat protection help sustain wearer performance across shifts.

Occasional-Use Maintenance and Inspections

Utility crews and municipal teams generally use the apparatus for periodic confined-space inspections where the low-weight carrying plate and easy-service components simplify readiness.

Ideal Applications and Work Environments

Where This Product Category Excels

Mine rescue operations: The 4-hour positive pressure design and robust Drägersorb 400 absorber suit extended underground rescues and high-abrasion conditions.
Tunnel and subway emergency response: Sentinel II mission data logging supports long access routes and coordinated multi-team responses.
Confined-space industrial entry: Ergonomic carrying plate and adjustable harness reduce fatigue during prolonged inspections and maintenance.
Hazmat and fire fighting in toxic atmospheres: Closed-circuit operation with CO2 absorption and positive pressure reduces potential ingress of contaminants into the breathing loop.

Professional Applications

Workers Who Rely on This Equipment

Firefighters: Use the PSS BG 4 plus for structural and vehicle fires where extended air supply and alarm functions aid mission management.
Mine rescue technicians: Rely on the apparatus for deep-mine rescues requiring extended duration and abrasion-resistant CO2 absorption.
Confined space entry teams: Wear the closed-circuit unit during vault, tank, and sewer entries where thermal comfort and balance matter.
Emergency responders: Deploy the system for hazmat and tunnel incidents where mission data logging and alarm thresholds improve situational awareness.
Safety coordinators: Specify the unit for long-duration tasks and oversee maintenance, recharge, and consumable replacement schedules.

Complete Safety Equipment Solutions

Complementary Safety Gear

Closed-circuit breathing apparatus work alongside full-face masks, oxygen cylinders, gas detectors and rescue harnesses to form layered respiratory and rescue systems.

Recommended Equipment Combinations

Confined-space rescue: PSS BG 4 plus + full-face mask FPS 7000 RP + gas detector + rescue harness
Tunnel response: PSS BG 4 plus + Sentinel II monitoring + portable radio + oxygen cylinder backup
Hazmat entry: PSS BG 4 plus + heat protection for hoses + T-piece water trap + single-use CO2 absorbers

Selection Guide and Product Suitability

When to Choose This Product

Choose the PSS BG 4 plus for extended confined-space and underground operations that commonly require up to four hours of closed-circuit breathing capability and mission data logging.

Key Evaluation Factors

Required operational duration and escape margin
Compatibility with full-face mask FPS 7000 RP and oxygen cylinder types
CO2 absorber type (single-use vs. refillable) and service interval
Thermal management needs such as cooler and optional heat protection

Limitations and Alternative Considerations

This closed-circuit system generally does not replace specialized electrical-class insulated head or dielectric-specific equipment for electrical exposure; consider alternative certified PPE for those tasks. Available from All Safety with standard, expedited, or overnight shipping to suit project timelines.

Daily Use and Maintenance

Workplace Integration

When teams deploy the PSS BG 4 plus, they typically carry and operate the unit per manufacturer instructions, using Sentinel II to monitor remaining duration and temperature during missions.

How do I fit and adjust the harness and full-face mask?

Adjust the shoulder straps and pull-forward harness for a balanced carry and confirm full-face mask seal using standard fit-check procedures per manufacturer instructions.

Care and Replacement Guidelines

Inspect hoses, seals, valves and electronics before and after each use and clean components with approved agents as recommended by the manufacturer.

When should I replace the CO2 absorber or Drägersorb 400?

Replace Drägersorb 400 and single-use absorbers per manufacturer intervals or after mileage/time limits and store sealed absorbers until use following manufacturer storage guidance.

Ordering and Delivery

How to order

Contact All Safety sales or use the website product page to request a quote, specify required accessories such as FPS 7000 RP masks or refillable CO2 cartridges, and confirm service or retrofit options.

Shipping options

All Safety supports standard, expedited, or overnight shipping where available and coordinates packaging to protect sensitive electronics and single-use absorbers in transit.

Service, support and returns

Arrange retrofit kits, maintenance support, and spare parts through All Safety or authorized service centers and follow manufacturer instructions for servicing Sentinel II electronics and consumables.

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Draeger

Closed Circuit Breathing Apparatus - PSS BG-4 Plus, 4-hour Positive Pressure with Sentinel II | Draeger

Description

Closed Circuit Breathing Apparatus for Extended Hazardous Atmospheres