Which of the following is not a component of the SSR?

The correct answer identifies that the oxygen tank is not a component of the Self-Contained Self-Rescuer (SSR). The SSR is designed for emergency situations, offering miners a means of escape in environments with hazardous gases, such as smoke or carbon monoxide. It operates on a closed-circuit system, utilizing a breathing bag to store exhaled air, and it typically includes a chemical canister that absorbs carbon dioxide while supplying oxygen from the system's own stored resources.

The breathing bag is crucial for managing the air supplied to the user, allowing for efficient breathing during an emergency. The chemical canister plays a vital role in maintaining air quality by filtering out harmful gases. The facemask is designed to fit securely on the user's face, ensuring that they can inhale the purified air without interference.

In contrast, an oxygen tank is not part of the SSR's design, as the unit is self-contained and does not require an external oxygen supply. This self-reliance is essential for providing portability and ease of use in emergency situations, where access to additional oxygen sources would be impractical.