What feature does a high-limit pressure control have?

A high-limit pressure control serves a critical safety function in steam systems by ensuring that pressure does not exceed a predetermined threshold. The main characteristic of this type of control is its requirement for manual reset functionality. This means that when the high-limit is tripped due to excess pressure, it does not automatically resume operation. Instead, an operator must manually reset the control once the system has been safely addressed and the pressure has returned to a normal range. This feature is vital for preventing unintended safety hazards and ensuring that the operator is aware of and responds to potentially dangerous conditions.

The other characteristics, while they may apply to different types of controls or systems, are not defining features of high-limit pressure controls. For instance, automatic reset mechanisms might be found in other types of controls that are designed for rapid recovery without operator intervention. Continuous monitoring and remote control capability are also features that might be associated with more advanced control systems, but they do not specifically represent the functionality of a high-limit pressure control.