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Mathematical Modeling and Analysis of Dynamic Response of RTD using MATLAB

Surankumar V. Sawai, Vidya Aswar, SadikTamboli, Meera Khandekar

Reliability in extreme conditions of the RTDs have made them widely used in process industry for temperature measurement. They have good calibration and fast dynamic response time, as compare to other temperature sensor and these are important characteristic while selecting sensor. The number of problem that can affect the response time of RTDs: dynamic response time, failure in insulation, loose connection between extension lead, thinning of sensing wire, EMF effect, seeping of chemical from connection head into thermowell, and erroneous indication. The objective of this paper is to analysis and study of the time constant of different Resistance Temperature Detector (RTDs) used in process. The Resistance Temperature detector used in this experiment is Pt100 bare, Pt500 thermowell, Pt1000 sheath. There was three main purpose of this study. The first was to demonstrate dynamic behaviour of RTD. The second was, by means of time domain analysis to find out model of RTD using System Identification Toolbox. The third purpose was to understanding the different parameter that affect the dynamic response of RTD.