Hydrogen flux sensor assembly

An analyte sensing probe for attachment to a ferromagnetic surface, the probe comprising a flexible collector plate for placing against the surface, the collector plate having at least one side and hole in communication with one end of a capillary and defining when placed against the surface, a gap through which air may flow from the periphery of the plate to the capillary, the air entraining any analyte passing through the surface for measurement by an instrument connected in use to the capillary, wherein the probe further comprises a flexible magnetic assembly positioned on the side of the collector plate remote from the surface, the assembly being composed of a plurality of mutually articulated segments of which at least some are magnetically attracted to the surface;

• wherein the segments of the magnetic assembly are connected to each other by hinges, secured in place by at least one pin.