Question 733 Deck Safety

The correct answer is A) Exposure to carbon dioxide for more than 10 minutes. Carbon dioxide can interfere with the oxygen indicator's ability to accurately measure the oxygen concentration. Prolonged exposure to elevated levels of carbon dioxide, such as more than 10 minutes, can cause the oxygen indicator to provide an incorrect, lower reading of the actual oxygen concentration. This is because carbon dioxide can disrupt the sensor's electrochemical reaction that is used to detect and measure the oxygen levels. The other options are incorrect because exposure to low levels of sulfur dioxide or brief exposure to carbon dioxide would not significantly impact the oxygen indicator's readings. Only prolonged exposure to high carbon dioxide levels can lead to inaccurate oxygen concentration measurements.