The primary water level indicator activates alarms and generates an electrical signal that is proportional to what?

The primary water level indicator is designed to monitor the level of water within a system, such as a boiler. It activates alarms and generates electrical signals that directly correlate with the water level present in the tank or vessel. When the water level drops or rises to certain predetermined thresholds, the indicator provides appropriate feedback through alarms or signals to alert operators to conditions that may require their attention, such as low water levels that could lead to overheating or damage.

This functionality is critical for maintaining safe and efficient operations within a system. Understanding the water level helps ensure that there is sufficient water for safe and effective boiler operation, thus preventing failures. The other options relate to important system parameters but are not directly measured by the primary water level indicator; thus, they do not serve as the basis for the alarms and signals generated by this specific device.