SSR90

Question 1

What is the MSA/Auer SSR 90M?

Answer 1

A compact closed-circuit, self-contained, oxygen-generating rescue breathing apparatus with potassium dioxide (KOz) as the active chemical.

Question 2

What chemical is used in the SSR 90M for oxygen generation?

Answer 2

Potassium dioxide (KOz)

Question 3

How is oxygen generated in the SSR 90M?

Answer 3

When the wearer’s exhaled breath, containing carbon dioxide and water vapour, reacts with the chemical in the canister.

Question 4

What is the breathing rate at rest for the SSR 90M?

Answer 4

30 L/min

Question 5

What is the approximate service time of the SSR 90M at a slow run breathing rate?

Answer 5

60 min

Question 6

How does the oxygen production rate in the SSR 90M relate to the wearer’s demand?

Answer 6

The rate at which oxygen is produced is proportional to the demand of the wearer.

Question 7

What happens to oxygen production when the wearer breathes deeply?

Answer 7

The oxygen-generating chemical will more than satisfy the wearer’s requirements.

Question 8

What occurs when the wearer breathes at a sedentary rate?

Answer 8

Less carbon dioxide and water vapour are exhaled, slowing down the rate of oxygen production.

Question 9

What happens when a person moves vigorously while using the SSR 90M?

Answer 9

The increased demand for oxygen is satisfied immediately.

Question 10

What occurs to the breathing bag when the canister produces more oxygen than used after hard work?

Answer 10

The breathing bag will become over-inflated.

Question 11

How is excess oxygen managed in the SSR 90M?

Answer 11

The excess oxygen is vented through the relief valve on the breathing bag.

Question 12

What are the two indications that the KOz canister is becoming expended?

Answer 12

Fogging of the lenses on inhalation and increased resistance during exhalation

Question 13

What is the total weight of the SSR 90M unit in the case?

Answer 13

14.7 lb

Question 14

What is the weight of the SSR 90M unit itself?

Answer 14

10.3 lb

Question 15

How often must the SSR 90M be serviced?

Answer 15

After each use

Question 16

List the five main parts of the SSR 90M apparatus.

Answer 16

• Facemask and mouthpiece
• Breathing bag and breathing tube
• Oxygen-generating canister
• Carrying harness
• Stainless steel carrying case

Question 17

Describe the features of the full-facemask of the SSR 90M.

Answer 17

Foldable, twin lens, speaking diaphragm, threaded breathing tube connection

Question 18

What is included with the mouthpiece for special applications?

Answer 18

Noseclip and goggles

Question 19

What is the capacity of the breathing bag?

Answer 19

Approximately five litres

Question 20

What materials are used for the breathing bag?

Answer 20

Rubber with a red fabric covering

Question 21

Where is the relief valve located on the breathing bag?

Answer 21

On the front of the breathing bag

Question 22

What is the function of the valve housing in the breathing bag?

Answer 22

Contains inhalation and exhalation check valves, heat exchanger, particle filter, and connection for the internal exhalation tube

Question 23

What is the oxygen-generating canister filled with?

Answer 23

Potassium dioxide (KOz)

Question 24

How is oxygen delivered into the breathing bag from the canister?

Answer 24

By the chemical reaction of moisture and carbon dioxide with potassium dioxide

Question 25

True or False: The breathing tube is connected to the bottom of the breathing bag.

Answer 25

False

Question 26

Fill in the blank: The canister is a metal container filled with an oxygen-producing chemical called _______.

Answer 26

potassium dioxide (KOz)

Question 27

What does the central tube of the oxygen-generating canister do?

Answer 27

Delivers exhaled air to the bottom of the canister