Dynamic Temperature Measurement General Information The term dynamic temperature measurement covers all measurements during which thermal transients occur in a sensor irrespective of whether the transient is caused by temperature variations in the medium, whose temperature is to be measured, or in the temperature sensor, itself. Thus, unavoidable dynamic errors occur during the measurement of any temperatures, changing with time. Errors also arise during the temperature measurement of a medium at a constant temperature using a temperature sensor immersed in the medium. Determination of the dynamic errors of a thennometer, requires knowledge of its dynamic properties | Temperature Measurement Second Edition L. Michalski K. Eckersdorf J. Kucharski J. McGhee Copyright 2001 John Wiley Sons Ltd ISBNs 0-471-86779-9 Hardback 0-470-84613-5 Electronic 15 Dynamic Temperature Measurement General Information The term dynamic temperature measurement covers all measurements during which thermal transients occur in a sensor irrespective of whether the transient is caused by temperature variations in the medium whose temperature is to be measured or in the temperature sensor itself. Thus unavoidable dynamic errors occur during the measurement of any temperatures changing with time. Errors also arise during the temperature measurement of a medium at a constant temperature using a temperature sensor immersed in the medium. Determination of the dynamic errors of a thermometer requires knowledge of its dynamic properties. In many non-electric thermometers where the sensor and indicator form one inseparable unit the dynamic properties to be described must refer to the whole device. Electric thermometers are mostly used when it is essential to know the dynamic error so that it can be taken into consideration. Consequently the dynamic parameters of electric sensors will be the main topic for discussion in this chapter. It must be stressed that dynamic errors in temperature measurement are principally caused by the sensor. For this reason any influence of the dynamic properties of indicating instruments may be neglected in most cases. Knowledge of the dynamic properties of a temperature sensor is necessary for the following main cases to determine the necessary immersion time while measuring a constant medium temperature to determine the dynamic errors while measuring temperatures changing with time to compare the dynamic properties of different temperature sensors so that the one best suited for a specific application may be chosen to determine the true temperature variations of temperatures changing in time by correcting known indicated values .
