Ocenco SCBA Air Time Calculator

Ocenco EEBD & SCSR Duration Calculator – M-20.2 and EBA 6.5

Important: Ocenco devices are NOT conventional compressed-air SCBA. The M-20.2 is a belt-worn EEBD (Emergency Escape Breathing Device) using compressed oxygen, rated for escape from hazardous atmospheres — not entry or firefighting. The EBA 6.5 is a SCSR (Self-Contained Self-Rescuer), a closed-circuit rebreather using oxygen for extended mining escape. Standard SCBA air time formulas do not directly apply to oxygen-based or rebreather devices. The duration estimates on this page use modified inputs to approximate rated duration — always refer to manufacturer documentation for certified duration.

EEBD vs SCBA vs SCSR: critical distinctions

An SCBA (Self-Contained Breathing Apparatus, EN 137 / NFPA 1981) is certified for entry into IDLH atmospheres and structural firefighting. An EEBD (EN 1146 / NIOSH 42 CFR 84) is certified for emergency escape only — evacuating from a hazardous area to safety — not entry. An SCSR (MSHA/NIOSH for mining) is a closed-circuit rebreather for self-rescue in mining emergencies, typically with much longer rated duration due to oxygen-scrubbing chemistry. Using an EEBD or SCSR as a substitute for entry-certified SCBA is not permitted under any safety standard and creates serious risk.

Ocenco M-20.2: compressed oxygen EEBD — not compressed air

The Ocenco M-20.2 uses a compressed oxygen cylinder (0.4L at 200 bar), not compressed breathing air. This matters for calculation: standard SCBA formulas assume nitrogen-oxygen air mixture. With 100% oxygen, the demand valve flow rate, cylinder charge, and rated duration are calculated differently by the manufacturer. The M-20.2 is NIOSH-rated for 10 minutes at working level or up to 32 minutes at rest. The calculator inputs for this unit are configured to approximate this rated range — do not override with custom pressure inputs unless you have manufacturer documentation supporting different values.

Ocenco EBA 6.5: closed-circuit rebreather for mining escape

The EBA 6.5 is MSHA and NIOSH certified for mining self-rescue operations. It operates as a closed-circuit rebreather: exhaled breath passes through a CO2 scrubber, has oxygen replenished from the cylinder, and is re-breathed. This dramatically extends duration compared to open-circuit SCBA at the same cylinder size. The EBA 6.5 is rated for 60 minutes of active escape or up to 8 hours in a waiting/survival shelter scenario. The calculator uses approximate inputs; actual duration depends heavily on workload and CO2 scrubber performance.

Why standard RMV values don't apply to the M-20.2 and EBA 6.5

Standard firefighting RMV presets (30–75 L/min) reflect open-circuit air consumption rates. Closed-circuit devices (EBA 6.5) recycle exhaled gas, so total oxygen consumption per minute is far lower than equivalent open-circuit consumption. The M-20.2 (demand-flow oxygen) uses a different demand flow profile. RMV presets on these models are set to reflect effective oxygen depletion rates that approximate manufacturer-rated duration, not direct L/min breathing rates.

Where Ocenco devices are typically deployed

The M-20.2 EEBD is the world's smallest belt-worn escape device and is used extensively in vessel crew escape kits (SOLAS-regulated), industrial facility emergency egress, and confined space rescue support. The EBA 6.5 is primarily a mining emergency device for self-rescue from collapsed or gas-hazard environments. Neither is a firefighting tool — their value is in escape and survival, not entry and suppression.

FAQ

This is an estimate based on the values you enter. Real-world air consumption changes with workload, stress, temperature, mask seal, leaks, and individual physiology. Always follow your SOPs and monitor your pressure gauge continuously.