What happens when the drum level sensor indicates a drop in water level in a two element control system?

In a two-element control system used in boiler operations, the drum level sensor plays a crucial role in maintaining the appropriate water level within the boiler drum. When the sensor indicates a drop in water level, it signals the need for corrective action to ensure safe and efficient operation.

The system responds by adjusting to increase the feedwater flow. This is essential because a decrease in water level can lead to insufficient cooling of the boiler components and even boiler damage if not addressed promptly. By increasing the feedwater flow, the system ensures that more water enters the boiler, thus raising the water level back to the desired set point.

The correction must happen quickly to maintain safe operating conditions, and the response initiated by the control system is automatic, emphasizing the reliability and importance of the control logic set in place to manage such situations effectively. The increased feedwater flow directly counters the drop in water level, allowing the system to stabilize and continue operating safely.