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. In applicable standards and sets of rules (VDI/VDE, 2014; DIN, 2010, 2017),recommendations are made concerning the types of experiments for determiningthe dynamic parameters in fluids (flowing water and flowing air) underwell-defined conditions. In the data sheets of the thermometer manufacturers,quite different specifications can be found, such as time percentage values ortime constants. Only a few thermometer manufacturers specify the medium andflow conditions under which these parameters have been determined. Above all,it is not common practice to indicate a measurement uncertainty for thedynamic parameters found. In Augustin et al. (2017), a first model for theindication of the measurement uncertainty of dynamic parameters in flowingair was presented. The present paper describes the results of a bilateral comparison made forthe first time for determining dynamic parameters in the laboratories of theJUMO GmbH & Co. KG Fulda company and at the Institute of ProcessMeasurement and Sensor Technology of the TU Ilmenau. In doing so, two type-Nthermocouples with different diameters were investigated in experimentalfacilities with flowing water and flowing air. Subsequently, the dynamicparameters found were compared with each other. The differences revealedmainly resulted from plant-specific parameters.

Bilateral comparison for determining the dynamic characteristic values of contact thermometers in fluids