Which component within the general regulator combustion control system develops a demand signal to maintain the boiler at a desired standard?

The steam pressure controller is the component responsible for developing a demand signal within the general regulator combustion control system to maintain the boiler at a desired pressure level. It continuously monitors the steam pressure within the system and sends control signals to the combustion system to adjust fuel flow when necessary. This ensures that the boiler operates efficiently and maintains stable steam pressure, which is crucial for steam generation and overall system performance.

The other components listed have different roles. A flow meter measures the flow rate of steam or water but does not directly control combustion. A temperature sensor provides important data regarding the temperature of steam or other system fluids but does not generate demand signals for combustion control. The fuel valve actuator responds to signals from the combustion control system by adjusting the fuel supply based on the demand created, but it is not the component that initially develops the demand signal. Thus, the steam pressure controller is key to maintaining the boiler's specified operating conditions.