What type of gas can the PAM not test for?

The primary reason water vapor is not testable by the Portable Analytical Monitor (PAM) is that PAM is designed to measure specific gases by analyzing their chemical properties and concentrations in the air. Unlike gases like carbon monoxide, volatile organic compounds, and carbon dioxide, which are identifiable and quantifiable using the PAM's sensors, water vapor presents a unique challenge because it is not a gas that can be effectively isolated or measured in the same manner.

Water vapor is a naturally occurring component of the atmosphere and can exist at varying concentrations depending on environmental conditions. The PAM is not equipped to differentiate or measure water vapor levels, as its sensors are primarily tuned to detect specific harmful gases that require monitoring in confined or hazardous environments. Thus, when it comes to the PAM's capabilities, water vapor is simply beyond its measurement scope, making it the correct choice.

The other gases listed can be reliably detected by the PAM utilizing its intended technology, which highlights the limitations of the device related specifically to water vapor.