Which device is primarily used to monitor the pressure in a boiler system?

The device used to monitor the pressure in a boiler system is the pressure gauge. This instrument is specifically designed to measure and display the pressure of fluids within a system, allowing operators to ensure that the pressure remains within safe and operational limits.

In a boiler system, maintaining the correct pressure is critical for safe and efficient operation, as deviations can lead to unsafe conditions or system failures. The pressure gauge provides real-time data, which is essential for monitoring the system's performance and for making necessary adjustments.

While a thermometer measures temperature and is important for monitoring steam or water temperatures in a boiler, it does not provide pressure readings. A flow meter measures the flow rate of liquids or gases but does not monitor pressure directly. A manometer can be used to measure pressure, but it is typically used for measuring low pressure or vacuum conditions and is less common in standard boiler systems compared to a pressure gauge. Therefore, the primary device used for monitoring pressure in a boiler system is the pressure gauge.