Hydrogen sensors utilize the specificity of alloys in hydrogen selection to achieve hydrogen detection applications under various complex working conditions. This sensor has advantages such as good selectivity, no cross interference, no need for oxygen to participate in reactions, and long service life. Its unique technical advantages are also reflected in the sensor’s ability to accurately and reliably detect hydrogen gas in saturated water vapor, and its operation is not affected by condensate water, even able to withstand immersion in liquid water.