Device and Method for Calibration of Measuring Instruments

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The invention describes a device and method for calibrating analytical instruments that measure trace substances. It features a sealable, temperature-controlled diffusion chamber equipped with a weighing unit. A calibrant material is placed on the weighing unit, and under controlled conditions, the vapor released from the calibrant is measured and used to calibrate measurement devices accurately.

Use CasesContent extracted from patent full text and abstract with AI.

• Calibration of laboratory equipment used for trace substance analysis in chemistry or environmental science labs
• Quality assurance in pharmaceutical manufacturing involving sensitive measurements
• Routine maintenance of gas analyzers in industrial or research applications
• Calibration of air monitoring or pollution detection devices

BenefitsContent extracted from patent full text and abstract with AI.

• Increases the accuracy and reliability of analytical measurement devices
• Allows in-situ calibration without removing or disturbing sensitive analyzers
• Provides controlled and repeatable calibration conditions via temperature and atmosphere regulation
• Enables direct and precise determination of calibration substance usage and vapor release

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Patent Abstract

The invention relates to a device for calibrating measuring instruments for trace substance analysis, comprising a closable, atmospherically controllable, temperature-controllable diffusion chamber, wherein the diffusion chamber has at least one main gas inlet, a partial gas outlet, and at least one sampling gas outlet connected to analysis instruments, wherein the device is characterized in that it has a weighing unit in the interior of the diffusion chamber, on whose detection surface a calibration substance is applied. The invention further relates to a method for calibrating measuring instruments, comprising the steps: a. Applying a calibration substance to the detection surface of a weighing unit located in the interior of a closable, atmospherically controllable, temperature-controllable diffusion chamber b. Closing the diffusion chamber and temperature-controlling the interior to a constant temperature at which a constant amount of vapor is released from the calibration substance c. Passing a constant inert gas stream through the diffusion chamber d. Branching off a sampling gas stream from the total gas stream, which is composed of the inert gas stream and the vapor amount of the calibration substance, and supplying it to an analysis instrument and analyzing the vapor amount e. In-situ determination of the mass change of the calibration substance at constant temperature and constant inert gas stream using the weighing unit located in the interior f. Determination of the concentration of the calibration substance from the vapor analysis and the mass change according to steps d) and e).