Abstract: A method is provided for calibrating a measurement process for a measurement system having a fluid detector, which is provided with a preconcentrator and a fluid sensor. The measurement system for detecting a concentration of a substance to be detected has a sorption phase, during which the fluid to be detected is enriched for a sorption duration (t) in the preconcentrator in a first state, and a measurement phase, in which a concentration of the substance to be detected resulting from the release of the substance to be detected that was enriched in the preconcentrator is measured. The fluid detector is calibrated by adjusting the sorption duration (t).

Abstract: Disclosed is a holding device for a cellular phone (100), comprising a holding surface (215), a top holding rail (220, 435) that is spaced apart from the holding surface (215), and a pressing unit (300, 450). Said pressing unit (300) encompasses an elastic pressing element (340) which can apply a holding force (Fhold) extending parallel to the longitudinal axis of the cellular phone (100) to a base region (107) of the cellular telephone (100) such that a top region (106) of the cellular phone (100) is pressed against the top holding rail (220, 435). Said top holding rail (220, 435) and a bottom holding rail (260, 436) are provided for securing the cellular telephone (100) against a transversal force on the holding surface (215).

Abstract: Disclosed is a holding device for a cellularphone (100), comprising a holding surface (215), a top holding rail (220, 435) that is spaced apart from the holding surface (215), and a pressing unit (300, 450). Said pressing unit (300) encompasses an elastic pressing element (340) which can apply a holding force (Fhold) extending parallel to the longitudinal axis of the cellular phone pressed against the top holding rail (220, 435). Said top holding rail (220, 435) and a bottom holding rail (260, 436) are provided for securing the cellular telephone (100) against a transversal force on the holding surface (215).