Despite their advantages, catalytic sensors have some limitations: - Oxygen Dependence: Many catalytic sensors require the presence of oxygen to function properly, which can be a limitation in oxygen-deficient environments. - Poisoning: Catalysts can be poisoned by certain chemicals, such as sulfur compounds, which can deactivate the sensor. - Limited Lifespan: The catalytic materials can degrade over time, reducing the sensor's effectiveness and necessitating replacement. - Cross-Sensitivity: While selective, they can still respond to other gases, leading to false positives under certain conditions.
