Which measures wind speed and shuts the system off at a pre-set wind speed?

• A. Rain Sensor
• B. Wind Sensor
• C. Flow Sensor
• D. Pressure Sensor

Answer: (B)

The key idea here is using a wind sensor to protect irrigation from wind drift. A wind sensor, typically an anemometer, measures how fast the air is moving and feeds that information to the controller. When the wind speed reaches a preset threshold, the system is commanded to stop watering to prevent spray drift, overspray onto sidewalks or neighboring areas, and wasted water. Once wind speeds drop below the threshold for a short period, watering can resume.

Other sensors measure different things: a rain sensor detects rainfall to skip irrigation, a flow sensor watches the actual water flowing through the system to catch leaks or misadjusted heads, and a pressure sensor monitors the supply pressure to ensure proper operation. They don’t measure wind speed or shut the system off based on wind, so they don’t fit the scenario.