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Archive June 2020

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A Myth About Valve Circuits

MYTH: IF A CIRCUIT HAS CONTINUITY, A VALVE SHOULD WORK ELECTRONICALLY.


You’d think that’d be sound logic — but think again. This reasoning isn’t sound at all. I am sure you might be wondering why. As an irrigator troubleshooting a valve circuit, you will likely use a circuit tester that flashes a green light or emits a tone when it detects continuity in a circuit. No continuity results in a red light or no tone. Even multimeters that are set to measure ohms emit an audible tone to indicate that a circuit has continuity. What often happens is a technician will interpret the test instrument’s tone, beep or green light to mean that the circuit being testing is free of faults. Stop right there.