A properly operating thermocouple connected to a gas valve should put out 20 to 30 millivolts.

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Multiple Choice

A properly operating thermocouple connected to a gas valve should put out 20 to 30 millivolts.

A thermocouple in a standing-pilot gas valve system generates a small DC voltage that holds the valve open when flame is present. That voltage is typically in the tens of millivolts range, and for a properly operating setup you’d expect about twenty to thirty millivolts. If the flame is present and the system is healthy, this range is what keeps the valve energized; voltage much lower than this can fail to hold the valve, and voltages much higher than this are not typical for standard safety designs. So the statement aligns with how these systems are designed to work, making it correct.

A thermocouple in a standing-pilot gas valve system generates a small DC voltage that holds the valve open when flame is present. That voltage is typically in the tens of millivolts range, and for a properly operating setup you’d expect about twenty to thirty millivolts. If the flame is present and the system is healthy, this range is what keeps the valve energized; voltage much lower than this can fail to hold the valve, and voltages much higher than this are not typical for standard safety designs. So the statement aligns with how these systems are designed to work, making it correct.

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