Hydrogen leak detector for detecting leaks in hydrogen gas conducting components, comprising a hydrogen gas detector adapted to measure the concentration of hydrogen gas in the gas within a gas conduction path, said hydrogen gas detector comprising: a first gas sensor being hydrogen selective and adapted to react to a first range of relatively low hydrogen concentrations below a first threshold, and a second gas sensor being hydrogen sensitive and non-selective to hydrogen, and sensitive to at least one further secondary gas different from hydrogen, and being adapted to react to a second range of relatively higher hydrogen concentrations above the first threshold, wherein the hydrogen leak detector is adapted to calibrate the second gas sensor for low concentrations of hydrogen which are present in the ambient atmosphere of the hydrogen gas detector and which do or do not originate from a leak in a hydrogen gas conducting component under test, by measuring the hydrogen concentration in a measured gas taken from the ambient atmosphere with the first gas sensor and with the second gas sensor, and by assigning the measurement signal of the second gas sensor of said measured gas to correspond to a concentration which does not originate from a leak in a hydrogen gas conducting component under test, if the measurement signal of the first sensor of said measured gas indicates a hydrogen concentration below a predetermined value, and wherein a hydrogen leak is considered as present in a hydrogen gas conducting component under test if the second gas sensor indicates a hydrogen concentration above a second threshold. a hydrogen gas detector adapted to measure the concentration of hydrogen gas in the gas within a gas conduction path, said hydrogen gas detector comprising: a first gas sensor being hydrogen selective and adapted to react to a first range of relatively low hydrogen concentrations below a first threshold, and a second gas sensor being hydrogen sensitive and non-selective to hydrogen, and sensitive to at least one further secondary gas different from hydrogen, and being adapted to react to a second range of relatively higher hydrogen concentrations above the first threshold, a first gas sensor being hydrogen selective and adapted to react to a first range of relatively low hydrogen concentrations below a first threshold, and a second gas sensor being hydrogen sensitive and non-selective to hydrogen, and sensitive to at least one further secondary gas different from hydrogen, and being adapted to react to a second range of relatively higher hydrogen concentrations above the first threshold, wherein the hydrogen leak detector is adapted to calibrate the second gas sensor for low concentrations of hydrogen which are present in the ambient atmosphere of the hydrogen gas detector and which do or do not originate from a leak in a hydrogen gas conducting component under test, by measuring the hydrogen concentration in a measured gas taken from the ambient atmosphere with the first gas sensor and with the second gas sensor, and by assigning the measurement signal of the second gas sensor of said measured gas to correspond to a concentration which does not originate from a leak in a hydrogen gas conducting component under test, if the measurement signal of the first sensor of said measured gas indicates a hydrogen concentration below a predetermined value, and wherein a hydrogen leak is considered as present in a hydrogen gas conducting component under test if the second gas sensor indicates a hydrogen concentration above a second threshold.