Which device is used to sense infrared or ultraviolet rays in a boiler?

The flame scanner is specifically designed to detect infrared or ultraviolet rays emitted during the combustion process within a boiler. This device plays a crucial role in ensuring safety and efficiency by monitoring the presence of a flame. If the flame goes out, the flame scanner detects the absence of the infrared or ultraviolet radiation that would otherwise be present, and it can trigger safety systems to prevent potential hazards such as the buildup of explosive gases.

In contrast, the temperature gauge measures the temperature of the boiler's water or steam, while the pressure switch monitors the pressure levels within the system. The flow meter evaluates the flow rate of fluids, ensuring that the correct amount enters and leaves the boiler but does not interact with infrared or ultraviolet emissions. Each of these devices has a distinct function related to overall boiler operation but does not fulfill the specific function of sensing flame characteristics like the flame scanner does.