What is the supervisory signal for a non-pressurized water tank level?

The supervisory signal for a non-pressurized water tank level is typically set at -12 inches. This means that when the water level in the tank drops to 12 inches below a specified reference point, it triggers a supervisory alarm. This is crucial for monitoring the condition of the water tank to ensure that low water levels are detected promptly, allowing for necessary actions to be taken before the tank becomes critically low.

This specific level is important because it serves as a threshold that indicates the necessity for maintenance or intervention, helping to prevent issues such as pump cavitation or water supply interruptions. By maintaining oversight at this level, alarm systems can contribute to the overall efficiency and reliability of the water system being monitored.