Why do manufacturers provide sunshields for outside air temperature sensors?

• A. To prevent direct sunlight from affecting outside air temperature sensor operation.
• B. To shield sensors from rain.
• C. To increase measurement range.
• D. To reduce power consumption.

Answer: (A)

Direct sun can heat a temperature sensor and the nearby surfaces, causing readings to be higher than the actual air temperature. A sunshield blocks direct solar radiation while still letting air circulate around the sensor, so the sensor can come to equilibrium with the surrounding air rather than being warmed by sunlight. This keeps measurements of outside air temperature accurate and consistent, which is essential for reliable control and monitoring. Other effects like rain protection can be provided by separate shields, but the primary purpose of a sunshield is to prevent radiant heating from the sun.