Abstract: In various embodiments, both very high speed and very high sensitivity hydrogen detection is achieved by controlling water vapor concentration over the catalyst used to convert hydrogen in sample gas (e.g., ambient air) to water vapor, to provide a substantially stable water vapor mixing level at a target mixing ratio. The naturally-occurring water vapor in the sample gas, without further steps, typically would vary over time within a wide range (e.g., due to changing atmospheric conditions). By controlling a level of water vapor over the catalyst to be substantially equal to a target mixing ratio that is not too low as to impair response time, and not too high as to impair sensitivity, both very high speed and very high sensitivity can be provided.

Abstract: A storage tote includes a base and a selectively movable lid. A support assembly is secured to the base and movable between a folded position and a deployed position. In the folded position, the support assembly extends generally parallel to the surface upon which it is supported. In the deployed position, the support assembly extends generally downwardly to support the base at a height substantially above the support surface. The support assembly may include a pair of opposing legs. The support assembly may additionally include a one or more pairs of wheels for selective movement of the storage tote from one location to another. A leg retention assembly may be provided for securing the legs in the folded position to prevent accidental or otherwise unwanted movement of the legs from the folded position.

Abstract: A storage tote includes a base and a selectively movable lid. A support assembly is secured to the base. The support assembly is movable between a folded position and a deployed position. In the folded position, the support assembly extends generally parallel to the surface upon which it is supported. In the deployed position the support assembly extends generally downwardly to support the base at a height substantially above the support surface. In this manner, the storage tote may be configured in at least two orientations as desired for access by the user thereof. The support assembly may include a pair of opposing legs. The storage tote may be insulated.