RHZK6.8/D Self-contained Open-circuit Compressed Air Breathing Apparatus

2. Carbon Fiber Cylinder
   The apparatus is equipped with a 6.8 L fully wrapped carbon-fiber composite cylinder. The inner liner is made of high-strength, corrosion-resistant aluminum alloy material.

• Weight (when cylinder pressure reaches 30 MPa): ≤13 kg
• Rated working pressure: 30 MPa
• Hydrostatic test pressure: 50 MPa
• Burst pressure: 102 MPa
• Cylinder valve interface thread specification: G5/8

The cylinder valve is equipped with a built-in dual-sided pressure gauge, allowing real-time monitoring of internal cylinder pressure.

3. Flame Retardant Performance
   Components, including the back frame, harness straps, buckles, cylinder protective cover, full face mask, medium-pressure hose, demand valve, and rescue connection interface, are all flame-retardant.

• Afterflame time: ≤0 seconds
  
  

4. Wearing Weight

• Total wearing weight: ≤11 kg
  
  

5. Airtight Performance of the Complete Unit
   After the airtightness test, the pressure gauge reading shows:

• Pressure drop within 1 minute: 0 MPa
  
  

6. Dynamic Breathing Resistance

When cylinder pressure is 30–2 MPa and breathing flow is 40 × 2.5 L/min:

• Inhalation resistance: ≤380 Pa
• Exhalation resistance: ≤625 Pa

When cylinder pressure is 2–1 MPa and breathing flow is 25 × 2 L/min:

• Inhalation resistance: ≤250 Pa
• Exhalation resistance: ≤560 Pa
  
  

7. High & Low Temperature Resistance Performance

• High-temperature exhalation resistance: ≤730 Pa
• Low-temperature exhalation resistance: ≤280 Pa
• Radiant heat inhalation resistance: ≤160 Pa
• Radiant heat exhalation resistance: ≤600 Pa
  
  

8. Static Pressure

• Static pressure: ≤200 Pa
  
  

9. Alarm Performance

• Alarm activation pressure: 5 ± 0.5 MPa
• Continuous alarm sound level: Above 90 dB for more than 15 seconds

The alarm system features:

• Integrated sound and light alarm
• Fall detection alarm function

The alarm device has passed inspection by the National Explosion-Proof Inspection Center and has obtained an Explosion-Proof Certification Certificate.

10. Full Face Mask Performance

• Total field of vision retention: ≥80%
• Binocular field of vision retention: ≥65%
• Lens light transmittance: ≥93%
• CO₂ content in inhaled air: ≤0.9%

Additional features include:

• Anti-fog function
• HUD pressure head-up display device integrated inside the mask
• Built-in wireless Bluetooth receiving device

The transmitting device is integrated with the chest-mounted mechanical pressure gauge, enabling real-time transmission of the remaining air volume in the cylinder to the receiving device.

11. Reducer Performance

• Reducer output pressure: 6–0.9 MPa
  
  

12. Safety Valve Performance

• Closing pressure: ≥1.0 MPa
  
  

13. Pressure Gauge Performance
    After immersion in 1 meter of water for 24 hours, no water should enter the pressure gauge.

• Air leakage rate: ≤13 L/min
  
  

14. Ergonomic Backplate Design
    The SCBA backplate is designed according to ergonomic principles, specifically tailored to fit the Asian body structure. It closely conforms to the user's back, effectively reducing shoulder burden during operation and improving mobility during firefighting and rescue missions.

The webbing and fabric are made from solution-dyed aramid materials and equipped with 3M reflective strips to ensure visibility during nighttime rescue operations.

15. Demand Valve Performance
    The demand valve features a simple structure, strong functionality, large airflow output, and compact size.