What is the function of a water level gauge in a boiler?

The function of a water level gauge in a boiler is to indicate the water level within the boiler. This is crucial because maintaining the correct water level is essential for safe and efficient boiler operation. The water level gauge allows operators to monitor the water level in real-time, ensuring that it remains within safe limits.

If the water level is too low, it can lead to overheating and potential damage to the boiler. Conversely, if the water level is too high, it can result in water being carried over into the steam system, which can cause water hammer and other issues in the piping system. Therefore, having a precise indication of water level aids in maintaining boiler safety and performance, making it a vital component of boiler operation.

The other options do not correctly relate to the primary purpose of the water level gauge, as it is not responsible for controlling steam temperature, measuring fuel amounts, or reducing steam pressure. Each of those functions is managed by different boiler components and systems.