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