Temperature Measurement (AFM03)

Learn the basic principles of temperature measurement and the application of temperature measuring instruments.

Prerequisites

This lesson is designed for participants familiar with basic mathematical operations including algebra.

Description

This lesson presents the basic principles of temperature measurement and the application of temperature measuring instruments. Various temperature-measuring instruments are discussed including thermometers, pyrometers, thermocouples, resistance temperature detectors, and thermistors.

Objectives

Recognize the importance of temperature measurement and control. Identify the principle of kinetic energy with a graph of molecular movement. Identify four scales used to indicate temperature. Define heat transfer in terms of conversion, conduction, and radiation. Define response time, stem loss, and radiation error. Identify the effect that inserting a sensor in a thermowell will have on the sensor??s temperature measurement and its response time. Identify the effect that thermal shunting will have on temperature measurement. Describe the principles of operation for a liquid in glass thermometer. Identify the reference and measuring junctions in a drawing representing a thermocouple. Identify the negative wire in a type J thermocouple. Identify the components of a thermocouple assembly when a thermocouple is inserted in a thermowell. Explain how a thermopile is used to produce greater output in response to smaller temperature change. Identify the use and application of thermocouples joined in parallel. State the principle of operation for a resistance temperature detector. Identify the bridge circuit??s operation in an RTD to measure temperature. Identify the effect strain will have on a resistance temperature detector. Identify the type, design considerations, and strain on various types of RTDs. Identify a voltage divider circuit??s operation in a thermistor circuit to measure temperature. State the principle of operation for a thermistor.