What does a pressure gauge reading a vacuum indicate for a kettle when it is cold?

When a pressure gauge on a kettle reads a vacuum while the kettle is cold, it indicates that the kettle is functioning correctly. A vacuum reading typically occurs when the kettle has cooled down after being in use. This happens because the steam inside the kettle condenses back into water, creating a vacuum as the pressure drops.

Under normal conditions, when the kettle is not in operation and the contents are cool, seeing a vacuum is expected and signifies that the kettle is not leaking or retaining unnecessary pressure. This reading would not suggest malfunctions, maintenance needs, or the necessity for replacement, as those scenarios would typically present different gauge readings or operational issues.

Understanding the function of the pressure gauge in this context is crucial for operators, as it helps in monitoring the kettle’s performance and ensuring safety during operation.