SSR90 Flashcards
What is the MSA/Auer SSR 90M?
A compact closed-circuit, self-contained, oxygen-generating rescue breathing apparatus with potassium dioxide (KOz) as the active chemical.
What chemical is used in the SSR 90M for oxygen generation?
Potassium dioxide (KOz)
How is oxygen generated in the SSR 90M?
When the wearer’s exhaled breath, containing carbon dioxide and water vapour, reacts with the chemical in the canister.
What is the breathing rate at rest for the SSR 90M?
30 L/min
What is the approximate service time of the SSR 90M at a slow run breathing rate?
60 min
How does the oxygen production rate in the SSR 90M relate to the wearer’s demand?
The rate at which oxygen is produced is proportional to the demand of the wearer.
What happens to oxygen production when the wearer breathes deeply?
The oxygen-generating chemical will more than satisfy the wearer’s requirements.
What occurs when the wearer breathes at a sedentary rate?
Less carbon dioxide and water vapour are exhaled, slowing down the rate of oxygen production.
What happens when a person moves vigorously while using the SSR 90M?
The increased demand for oxygen is satisfied immediately.
What occurs to the breathing bag when the canister produces more oxygen than used after hard work?
The breathing bag will become over-inflated.
How is excess oxygen managed in the SSR 90M?
The excess oxygen is vented through the relief valve on the breathing bag.
What are the two indications that the KOz canister is becoming expended?
Fogging of the lenses on inhalation and increased resistance during exhalation
What is the total weight of the SSR 90M unit in the case?
14.7 lb
What is the weight of the SSR 90M unit itself?
10.3 lb
How often must the SSR 90M be serviced?
After each use
List the five main parts of the SSR 90M apparatus.
- Facemask and mouthpiece
- Breathing bag and breathing tube
- Oxygen-generating canister
- Carrying harness
- Stainless steel carrying case
Describe the features of the full-facemask of the SSR 90M.
Foldable, twin lens, speaking diaphragm, threaded breathing tube connection
What is included with the mouthpiece for special applications?
Noseclip and goggles
What is the capacity of the breathing bag?
Approximately five litres
What materials are used for the breathing bag?
Rubber with a red fabric covering
Where is the relief valve located on the breathing bag?
On the front of the breathing bag
What is the function of the valve housing in the breathing bag?
Contains inhalation and exhalation check valves, heat exchanger, particle filter, and connection for the internal exhalation tube
What is the oxygen-generating canister filled with?
Potassium dioxide (KOz)
How is oxygen delivered into the breathing bag from the canister?
By the chemical reaction of moisture and carbon dioxide with potassium dioxide
True or False: The breathing tube is connected to the bottom of the breathing bag.
False
Fill in the blank: The canister is a metal container filled with an oxygen-producing chemical called _______.
potassium dioxide (KOz)
What does the central tube of the oxygen-generating canister do?
Delivers exhaled air to the bottom of the canister
