Commodity Fumigation License Practice Exam

What do thermal conductivity analyzers (TCA) measure in a fumigation area?

1. Temperature of the fumigant

2. Concentration of gases

3. Pressure levels in the environment

4. Humidity levels of the air

The correct answer is: Concentration of gases

Thermal conductivity analyzers (TCA) are specifically designed to measure the concentration of gases in a given environment, such as a fumigation area. They operate by detecting changes in the thermal conductivity of the gas mixture present in the area being monitored. When a specific gas, such as a fumigant, is present, it will affect the thermal conductivity of the air or the gas mixture differently than other components. This allows the analyzer to quantify the concentration of the target gas based on the difference in conductivity. This capability is essential in fumigation practices, as it helps ensure that the fumigant is applied at the appropriate concentration for effective pest control while also monitoring to avoid harmful exposure to non-target organisms or individuals. The other options, while related to the conditions in a fumigation environment, are not the primary focus of what a TCA measures.