Which type of relays on a general regulator combustion control system prevent the master demand signal from bleeding out the range?

In a general regulator combustion control system, high and low-limit relays are crucial for ensuring the master demand signal operates within a safe and effective range. These relays act as safeguards by monitoring specific setpoints; when the demand signal exceeds predefined limits, the relays activate to prevent excessive fuel flow or unsafe combustion conditions. This function is critical because allowing the master signal to bleed out of its designated range can lead to inefficient combustion and potential hazards, such as overheating or equipment damage.

The high and low-limit relays essentially form a control boundary that maintains the integrity of the combustion process. By intervening when necessary, they help stabilize the system and ensure safe operation, which is fundamental in maintaining efficiency and safety within combustion systems.