Which type of irrigation controller is defined by electro-mechanical control using relays, timers, and counters wired together on an enclosure panel?

• A. Electromechanical Controller
• B. Hybrid Controller
• C. Central Controller
• D. Internet Based Controller

Answer: (A)

This is about how irrigation controllers implement control logic. An electromechanical controller relies on physical relays, timers, and counters wired together on an enclosure panel to sequence the irrigation zones. The clock drives the timers, the relays switch valves, and the counters track events, all with no digital processor or software involved. It’s a purely electromechanical setup, typically with dial-driven or motor-driven timers and hard-wired logic.

Hybrid controllers mix digital or electronic components with some mechanical parts, so a microprocessor or programmable features are present—this description doesn’t imply that. Central controllers and internet-based controllers involve networked or cloud connectivity and remote programming, which again isn’t what’s described here.