An air flow meter in a fuel cell system is a crucial component that measures the amount of air entering the fuel cell. Accurate measurement of air flow is essential for optimizing the performance, efficiency, and reliability of the fuel cell.

The air flow meter measures the rate at which air is entering the fuel cell. This measurement is typically expressed in units like liters per minute (L/min) or cubic meters per hour (m³/h).

Fuel cells, particularly proton exchange membrane (PEM) fuel cells, require a precise ratio of hydrogen to oxygen to operate efficiently. The air flow meter helps ensure that the correct amount of oxygen (from the air) is supplied to the fuel cell.