Why is it not advisable to breathe over the sensors in gas detection equipment?

Breathing over the sensors in gas detection equipment is inadvisable primarily because of the presence of carbon dioxide and moisture in exhaled air, which can poison the oxygen sensor. Oxygen sensors are designed to detect specific gas concentrations and can be negatively affected by other components in the air, such as carbon dioxide. The contamination of the sensor with these substances can lead to incorrect readings, as the sensor may interpret levels of carbon dioxide as levels of oxygen. This interference can compromise the accuracy and reliability of the gas detection equipment, potentially leading to dangerous situations if the sensor fails to detect hazardous gas levels accurately.

Moreover, exhaled moisture can also affect the sensor's performance by potentially causing corrosion or other physical changes within the sensor, further impairing its functionality. Maintaining the integrity of gas detection sensors is crucial for safety in environments where gases are monitored, making it essential to avoid any actions that could introduce contaminants.