What safety device is typically found in boiler systems to protect against excess temperature?

The emergency high-temperature limit switch is specifically designed to protect boiler systems from dangerous over-temperature conditions. In the event that the temperature in the boiler exceeds a predetermined level, this device automatically interrupts the operation of the burner or the heating mechanism, preventing further temperature rise. It acts as a critical safety control to ensure that the system does not reach hazardous levels that could lead to equipment failure or even catastrophic incidents.

This safety feature is essential because boilers operate under high pressures and temperatures, and any uncontrolled rise in temperature could result in significant risks, including explosions or other severe damages. The high-temperature limit switch provides an essential fail-safe mechanism that helps maintain safe operating conditions.

Other devices mentioned, like pressure relief valves, serve different safety functions, such as preventing excessive pressure build-up rather than specifically addressing temperature concerns. Flame sensors monitor the existence of a flame and ensure that the burner operates safely but do not directly control temperature. Water level indicators are essential for monitoring water levels to prevent dry firing but do not specifically address the issue of excess temperature. Each component serves an important role, but in the context of temperature safety, the emergency high-temperature limit switch is crucial for preventing overheating.