Scuba Diving International (SDI) Computer Nitrox Practice Exam

How does temperature affect oxygen sensors in diving equipment?

1. It has no effect on their accuracy

2. It can alter the readings of oxygen concentration

3. It enhances their response time

4. It can cause them to malfunction

The correct answer is: It can alter the readings of oxygen concentration

Oxygen sensors in diving equipment are designed to measure the concentration of oxygen in a gas mixture. Temperature plays a significant role in the accuracy of these readings. As the temperature changes, it can affect the chemical and physical properties of the sensing material used in the oxygen sensor. When the temperature rises or falls beyond the range for which the sensor is calibrated, it can lead to alterations in the readings of oxygen concentration. For example, higher temperatures might cause the sensor to read higher concentrations of oxygen than are actually present, while lower temperatures could yield lower readings. This temperature-induced variability can therefore compromise the reliability of the sensor's outputs, making it crucial for divers to account for temperature effects during dives. This understanding is vital for ensuring accurate dive planning and safety, as reliable readings of oxygen concentration are essential for preventing issues such as oxygen toxicity or hypoxia.