After each reading of an oxygen indicator, the instrument should be purged with
Direct Answer
Option A: fresh air
To ensure accuracy and prevent sensor damage or 'memory effects' from previous samples, the oxygen indicator must be purged with fresh ambient air. This restores the sensor to the baseline atmospheric oxygen concentration (approx 20.9%) before the next measurement.
All Options
Detailed Explanation & Context
To ensure accuracy and prevent sensor damage or 'memory effects' from previous samples, the oxygen indicator must be purged with fresh ambient air. This restores the sensor to the baseline atmospheric oxygen concentration (approx 20.9%) before the next measurement.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Oil Tanker Cargo Operations (TASCO).
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