INTRODUCTION

Having been involved in the design, manufacture and application of temperature sensors for twenty years, I have done a number of training seminars on temperature sensors. After presenting long winded explanations as to how RTD’s (Resistance Temperature Detectors) and thermocouples are constructed and used, people usually ask the question “OK, so how do I determine which sensor to use in my application?”. This paper is intended to answer that question.

After a brief review of how RTD’s and thermocouples are constructed and used to measure temperature, we will discuss what differentiates these sensors from one another. We will discuss the topics of temperature range, tolerance, accuracy, interchangeability and relative strengths and weaknesses for each type. After reviewing these topics you will have a better understanding as to when each type of sensor should be used and why.

Review of RTD and Thermocouple Basics

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