What is the input controller used in single-point positioning?

In single-point positioning, the primary input controller typically used is steam pressure. This is because steam pressure is a fundamental variable in steam systems that directly impacts the performance and efficiency of steam-operated equipment. The control of steam pressure allows for precise modulation of steam flow into various systems, ensuring that they operate within desired parameters.

For instance, maintaining the appropriate steam pressure allows for the effective delivery of heat, which is crucial for processes needing thermal energy, as well as for maintaining safety limits in steam boiler operations.

While other factors such as water temperature, oil viscosity, and airflow rate are important in many systems, they do not serve as the primary controllers in single-point positioning like steam pressure does. Water temperature can influence the efficiency of steam generation but is not the input controller for positioning. Oil viscosity is relevant in systems using oil as a fuel or lubricant but does not directly relate to steam operations. Airflow rate is essential in combustion and ventilation systems but does not play the same crucial role in steam system control as steam pressure.