This document provides an overview of Resistance Temperature Detectors (RTDs), highlighting their configurations, working principles, applications, advantages, and disadvantages. RTDs, particularly the widely used PT-100, measure temperature through resistance changes and can be configured in two, three, or four wire systems. While they offer high accuracy and stability, they come with complexities and limitations such as a restricted temperature range and higher costs.

1. Name Zahid Abbas
Roll No 312/F17
Group No #02
BSc Mech Engr & Tech

2. RTD’S

3. Introduction
Resistance Temperature Detector
Configurations
Working of RTD
Applications
Advantages
Disadvantage
Contents

4. INTRODUCTION
• Sir William siemens prefer the use
of platinum as the element in a
RTD.
• The classical resistance
temperature detector (RTD)
Construction using platinum was
proposed by C.H. Meyars in 1932

5. RESISTANCE TEMPERATURE DETECTOR(RTD’S)
 Resistance Thermometers are the
sensors used to measure
temperature by comparing the
resistance of the RTD element
with Temperature
 RTD converts the temperature
into the electrical resistance
,which can be measured using the
wheatstone Bridges
 A Wheatstone bridge is
an electrical circuit used to
measure an unknown electrical
resistance

6. PT 100
• PT-100 is a platinum RTD which
is most widely use in industries
• The resistance of the PT-100 RTD
is 100 Ω at 0 °C.
• Resistance Temperature of
platinum is 0.00392 °C

7. MATERIAL OF RTD’S

8. Name Ishtiaq Hussain
Roll No 304/F17
Group No #02
BSc Mech Engr & Tech

9. RTD’S CONFIGURATIONS
• RTD is available in basically three
configurations
• Two wire compensation
• Three wire compensation
• Four wire compensation

10. • Two wire compensation:-
• The 2 wire RTD configuration is
the simplest among RTD circuit
designs. In this serial
configuration, a single lead wire
connects each end of the RTD
element to the monitoring device.

11. • Three wire compensation:-
• The 3 wire RTD configuration is
the most commonly used RTD
circuit design and can be seen in
industrial process and monitoring
applications.

12. Four wire compensation:-
This configuration is the most
complex and thus the most time-
consuming and expensive to install,
but it produces the most accurate
results.

13. WORKING OF RTD

14. Name Taimoor Hussain
Roll No 305/F17
Group No #02
BSc Mech Engr & Tech

15. APPLICATIONS OF RTD’S
• Air Conditioning and
Refrigeration
• Food processing
• Grills
• Plastics processing
• Petrochemical process
• Air temperature measurement
• Gas temperature measurement
• Liquid temperature measurement
• Exhaust gas temperature
measurement

16. ADVANTAGES OF RTD SENSORS
• RTD sensors have many
advantages.
 Highly accurate
 High repeatability
 Offer precise measurement even
in extreme environments
 Long term stability
 Platinum RTD are suitable for
higher temperature ranges
 No special wire required for
installation
 Easy Installation
•

17. DISADVANTAGE OF RTD SENSOR
 The RTD require more complex
measurement circuit.
 More limited temperature range
(-200 deg C to 500 deg C)
 High initial price
 Slower response time than a
thermocouple
 Possibility of self heating.
• It is affected by shock and
vibration.