How should air temperature be checked according to the material?

• A. With a reliable thermometer read in direct sunlight
• B. With a thermometer immersed in ice water
• C. With a digital thermometer kept in shade
• D. With a temperature gun aimed at the surface

Answer: (A)

Measuring ambient air temperature requires a reliable thermometer that is exposed to the outdoor environment so the reading reflects the air conditions the plant operates in. The material specifies using a dependable thermometer and reading it in direct sunlight because this setup is described as capturing the true outdoor air temperature the equipment and processes experience, rather than an artificially cooled or heated surface. A thermometer immersed in ice water would only show near freezing and not the actual air conditions. A digital thermometer kept in shade can produce readings that don’t represent the air temperature in sunlit outdoor areas. A temperature gun measures surface temperature and radiation, not the air, so it isn’t suitable for gauging ambient air.