The BioPak 240 is a long duration rebreather that re circulates the user's exhaled breath. A small oxygen cylinder provides make-up gas to a breathing chamber. The user inhales the gas into the face piece. The user's exhaled breath passes through a carbon dioxide absorbent and back into the breathing chamber, where fresh oxygen is added. The replenished gas is now available for the next inhalation.
A spring-loaded diaphragm in the breathing chamber maintains positive pressure in the system. If the user's inhalation fully depletes the breathing chamber, a demand, free flow valve automatically supplies the additional oxygen required. If the user's exhalation causes the diaphragm to fully expand, excess gas is vented out of the relief valve.
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A loud, high-pitched, pressure activated whistle alarm sounds when approximately 20-25% of the service life remains. A manual bypass is provided to override the supply system in an emergency. A frozen gel tube coolant canister is added to the inhalation side of the breathing circuit to cool the breathing gas on the way to the mask.
Ease of Maintenance
User maintenance requirements are minimized. Most repairs and testing can be done in the field.
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