1. General Requirements
1.1 Meets all performance requirements of the PRC Fire Rescue Industry Standard XF 124-2013 "Positive Pressure Firefighting Air Breathing Apparatus".
1.2 The back frame bears a permanent manufacturer label and fire product certification certificate number.
1.3 The explosion-proof performance of the overall electrical components shall comply with GB/T 3836.1-2021 and GB/T 3836.4-2021 standards, with a rating no lower than Ex ib IIB T4 Gb.
2. System Composition
2.1 The complete air breathing apparatus consists of the mask assembly, demand valve assembly, back frame assembly, reduction system assembly, carbon fiber composite cylinder, alarm assembly, and pressure heads-up display device.
3. Mask Assembly
3.1 Field of view rate 83.9%, binocular field of view retention rate 70.2%, lens light transmittance 92.2%.
3.2 Window surface treated with hardening and anti-fog coating.
3.3 Mask body material is non-toxic, odorless, and non-irritating; mouth/nose piece uses high-quality medical-grade silicone, firmly connected and not easily detached; compatibility subject to on-site testing.
3.4 Uses ultra-thin Kevlar mesh hood, with elastic adjustment straps on top and sides to ensure tight fit of the sealing frame against the wearer's face without painful pressure.
4. Demand Valve and Back Frame Assembly
4.1 The medium-pressure hose of the demand valve assembly must not restrict head movement or interfere with valve connection; when bent, airflow resistance increase shall not exceed 5%; burst pressure shall be no less than 4 times the maximum designed output pressure of the reducer.
4.2 The medium-pressure output end of the reducer connects to the demand valve via a quick connector and is equipped with a rescue interface (waist or chest).
4.3 The back frame assembly is designed for universal use with 6.8L and 9L cylinders, featuring embedded air channel grooves to avoid snagging.
4.4 The back frame design conforms to ergonomics, freely bending to fit the back and effectively distributing load to the waist.
4.5 Shoulder and waist belts must be wide, thick, and securely connected; running 50 meters while wearing the SCBA should cause no significant shoulder pressure, with minimal apparatus sway.
4.6 All plastic buckle components are securely connected and non-detachable.
5. Reduction System and Carbon Fiber Cylinder
5.1 The reducing valve adopts a balanced design with automatic compensation balance piston to ensure stable output pressure and flow.
5.2 Overall airtightness (radiant heat resistance performance) 0.8 MPa.
5.3 The reducer is equipped with a safety valve to protect downstream components in case of failure.
5.4 Medium-pressure hoses possess flame-retardant, flexible, and aging-resistant characteristics.
5.5 The carbon fiber cylinder valve must be equipped with a high-pressure safety diaphragm and an embedded dual-side display pressure gauge.
5.6 Handwheel features anti-slip design, opens counter-clockwise, and includes lock/unlock functionality.
5.7 Cylinder body clearly marked with: Compressed Air, Cylinder Number, Hydrostatic Test Pressure, Nominal Working Pressure (30 MPa), Nominal Volume (6.8 L), Weight, Production Date, Inspection Cycle, Service Life, Product Standard Number, and warning text: "Warning: Do not fill if fiber breakage or damage is found."
6. Alarm and Pressure Display Components
6.1 The whistle emits a continuous audible alarm when cylinder pressure drops to 5.5 ± 0.5 MPa, continuing until pressure drops to 1 MPa.
6.2 Pressure heads-up display protection rating: Display module IP67, Transmitter module IP65.
6.3 Operating temperature range: -30 ℃ ~ 60 ℃, uses common market batteries, easy to replace.
6.4 Pointer-type pressure gauge equipped with rubber protective boot, range 35MPa, accuracy class 1.6, minimum scale value 1 MPa.
6.5 Dial has prominent markings in the alarm pressure zone and at 30 MPa, ensuring readability in dim environments. No water ingress allowed after waterproof testing.
6.6 Pressure heads-up display uses LED indicators:
- Cylinder pressure 30 MPa ~ 10 MPa: Green light steady on
- Cylinder pressure 10 MPa ~ 6 MPa: Yellow light steady on
- Cylinder pressure < 6 MPa: Red light flashing
- Low battery voltage: Yellow light flashing
- Pairing transmitter and display: Blue light flashing; turns off after successful pairing
7. Overall Unit and Protective Configuration
7.1 Cylinder nominal volume 6.8 L, nominal working pressure 30 MPa; at 30 MPa pressure, total worn weight is 11.4kg.
7.2 Hemispherical rubber boots added to cylinder top and bottom; entire cylinder body equipped with aramid flame-retardant protective sleeve, sewn with two rings of "Yellow-Silver-Yellow" reflective markings; printing/coating available upon request.
7.3 Connection between back frame and reducer uses screw fastening; welding or riveting is prohibited.
7.4 All straps (shoulder, pull, waist, cylinder tightening) must be made of flame-retardant materials and securely connected to the back frame (must pass pull and lift tests).
7.5 Quick-release plug-in interface used between cylinder and reducer.
8. Delivery and Spare Parts
8.1 Upon delivery acceptance, each set must include the following additional spare parts:
- Masks: 2 pcs
- Demand valves: 1 pc
- Rescue masks: 1 pc
- Dedicated O-ring kits: 6 sets
- Breathing diaphragms: 4 pcs
- Cylinder handwheel switches: 2 sets
- Whistles: 2 pcs
- Pointer-type pressure gauges: 1 pc
8.2 One set of dedicated repair tools provided for every 4 units (rounded down).
8.3 Two common market backup batteries provided per set.
8.4 Rescue mask bag made of navy blue aramid flame-retardant fabric, sewn with orange reflective markings.
8.5 All accessories individually packaged, plus one shockproof packing box capable of holding all accessories.
