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U-tube with piezo-electric actuator Digital density measuring principle. The oscillating U-tube is a technique to determine the density of liquids and gases based on an electronic measurement of the frequency of oscillation, from which the density value is calculated.
Anton Paar GmbH is an Austrian company based in Graz that develops, produces and sells analytical instruments for laboratories and process analytical technology. The company operates globally, with subsidiaries in 37 countries. [ 1 ]
Anton Paar ProveTec, formerly known as Petrotest GmbH, is a German company within the Anton Paar group that is known for its laboratory equipment for the chemical and petrochemical industries. Furthermore, Anton Paar ProveTec is manufacturing measurement instruments for the cosmetics industry, the aroma and fragrance industry, the food, and ...
There are two main uses of the term calibration in statistics that denote special types of statistical inference problems. Calibration can mean a reverse process to regression, where instead of a future dependent variable being predicted from known explanatory variables, a known observation of the dependent variables is used to predict a corresponding explanatory variable; [1]
The formal definition of calibration by the International Bureau of Weights and Measures (BIPM) is the following: "Operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties (of the calibrated instrument or ...
A calibration curve plot showing limit of detection (LOD), limit of quantification (LOQ), dynamic range, and limit of linearity (LOL).. In analytical chemistry, a calibration curve, also known as a standard curve, is a general method for determining the concentration of a substance in an unknown sample by comparing the unknown to a set of standard samples of known concentration. [1]
Reciprocity calibration is a specialist process, and because it forms the basis of the primary standard for sound pressure, many national measurement institutes have invested significant research efforts to refine the method and develop calibration facilities. A system is also commercially available from Brüel & Kjær.
A rate-jump method can be used to return an intrinsic elastic modulus of the sample that is independent of the test conditions. [28] In this method, a constitutive law comprising any network of (in general) non-linear dashpots and linear elastic springs is assumed to hold within a very short time window about the time instant tc at which a ...