Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia...
-
Upload
cecily-doyle -
Category
Documents
-
view
216 -
download
2
Transcript of Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia...
![Page 1: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/1.jpg)
Temperature Measurement
Muhajir Ab. RahimSchool of Mechatronic Engineering
Universiti Malaysia Perlis
![Page 2: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/2.jpg)
Introduction
• Almost all industrial processes need accurately controlled temperature.
• It will determined the desired quality of products (chemical, steel, plastic, nuclear and food industries)- temperature dependent products and processes.
![Page 3: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/3.jpg)
Temperature and Heat
• Temperature is the measure of the thermal energy in a body, which is relative hotness or coldness of a medium and is normally measured in degrees, using Fahrenheit, Celsius and Kelvin scale.
• Heat is a form of energy; as energy is supplied to a system the vibration amplitude of its molecules and its temperature increases. Example unit of heat is BTU and calorie unit.
• The temperature increase is directly proportional to the heat energy in the system.
![Page 4: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/4.jpg)
![Page 5: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/5.jpg)
Temperature Measurement
• Temperature measurement method can be broadly classified as follows;
1) Non-electrical method
2) Electrical method
3) Radiation method
![Page 6: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/6.jpg)
Non-electrical Method
• Example of non-electrical temperature measurement method;
1) Bimetallic thermometer
(based on the principle of solid expansion)
2) Liquid in glass thermometer
3) Pressure thermometers (based on the principle of fluid expansion)
low expansion material
high expansion material
![Page 7: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/7.jpg)
Electrical Method
• Electrical methods are in general preferred for the measurement of temperature as they furnish a signal which can be easily detected, amplified or used for control proposes.
• Example of temperature measurement by electrical methods are;
1) Thermocouple
2) Resistance Temperature Detector (RTD)
3) Thermistor
4) IC Sensor
![Page 8: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/8.jpg)
Temperature (T) Temperature (T)
Temperature (T)Temperature (T)
Vol
tage
(V
)
Res
ista
nce
(R)
Vo
ltag
e o
r C
urr
en
t (
V o
r I)
Res
ista
nce
(R)
Thermocouple Thermistor
IC Sensor
RTD
![Page 9: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/9.jpg)
Thermistor
RTD
IC Sensor
![Page 10: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/10.jpg)
Radiation Method
• The main advantages of radiation method in temperature measurement is because of non contact with the ubject of measurement. So it is applicable to high temperature, moving object..
• Example of radiation method temperature measurement instrument is pyrometer.
![Page 11: Temperature Measurement Muhajir Ab. Rahim School of Mechatronic Engineering Universiti Malaysia Perlis.](https://reader035.fdocuments.in/reader035/viewer/2022062804/56649ea95503460f94bae426/html5/thumbnails/11.jpg)
How to select?
• You need to consider several factors such as temperture range, required range, accuracy, environment, speed of response, ease of use and cost.
• Thermocouple are used in high temp chemical industries such as glass and plastic process.
• Thermistor and IC sensor usually used in electronic hobby and automotive industry.
• RTD commonly used in lower temp., higher precision chemical industries.