What is the primary function of a draft gauge?

The primary function of a draft gauge is to measure pressure differences, specifically the pressure difference between the inside of a combustion chamber or furnace and the outside atmosphere. This measurement is critical in ensuring proper combustion efficiency. By monitoring the draft pressure, engineers can assess how well the combustion gases are being expelled from the system and whether there is adequate air being supplied for the combustion process.

Maintaining the correct draft pressure is essential for safe and efficient operation of boilers and furnaces, as it directly affects fuel efficiency, emissions, and overall system performance. A well-functioning draft gauge allows for timely adjustments to be made, ensuring that the combustion process operates within optimal parameters.

The other options pertain to different aspects of boiler or furnace operation but do not represent the function of a draft gauge. For instance, measuring water level in the boiler relates to the safety and operation of the boiler itself, temperature measurements focus on the heat within the furnace, and fuel consumption monitoring helps assess efficiency but is not the role of a draft gauge.