According to safety standards, what must be monitored to manage steam pressure levels in boilers?

Automatic limiting devices are essential for managing steam pressure levels in boilers as they serve a critical safety function. These devices are designed to automatically shut down the boiler or limit its operation should the steam pressure exceed a predetermined level. This is crucial because excessive steam pressure can lead to dangerous situations such as boiler explosions or catastrophic failures.

By continuously monitoring the pressure within the boiler system, automatic limiting devices ensure that the pressure remains within safe operational limits. This provides a critical layer of protection for both the equipment and personnel operating the boiler.

In contrast, while thermocouples and pressure sensors can measure temperature and pressure, respectively, they do not automatically intervene if unsafe conditions arise. Thermocontrols may regulate temperatures but typically do not focus on pressure management directly. Therefore, while these other devices play significant roles in monitoring and controlling the system, automatic limiting devices are specifically essential for ensuring safety by managing steam pressure levels effectively.