(RTD) – simple temperature sensing tool.
made of conductive material
Work on principle of change of resistance of metal with respect to temperature
Rise in temperature reduce in resistance of conductive material
RTD types are broadly classified according to the different sensing elements used.(Pt, Ni ,Cu)
The thermocouple is a device which converts thermal energy to electrical energy. It is particularly used as a thermosensor. It has wider applications in instrumentation and measurements.
This PPT gathered many relevant topics relating to thermocouple like its working, principle, laws and different types.
Thank you!
A Thermocouple is a sensor used to measure temperature. Thermocouples consist of two wire legs made from different metals. The wires legs are welded together at one end, creating a junction. This junction is where the temperature is measured. When the junction experiences a change in temperature, a voltage is created. The voltage can then be interpreted using thermocouple reference tables to calculate the temperature.
There are many types of thermocouples, each with its own unique characteristics in terms of temperature range, durability, vibration resistance, chemical resistance, and application compatibility. Type J, K, T, & E are “Base Metal” thermocouples, the most common types of thermocouples.Type R, S, and B thermocouples are “Noble Metal” thermocouples, which are used in high temperature applications (see thermocouple temperature ranges for details).
Thermocouples are used in many industrial, scientific, and OEM applications. They can be found in nearly all industrial markets: Power Generation, Oil/Gas, Pharmaceutical, Bio Tech, Cement, Paper & Pulp, etc. Thermocouples are also used in everyday appliances like stoves, furnaces, and toasters.
Thermocouples are typically selected because of their low cost, high temperature limits, wide temperature ranges, and durable nature.
A thermocouple is a temperature-measuring device consisting of two dissimilar conductors that contact each other at one or more spots. It produces a voltage when the temperature of one of the spots differs from the reference temperature at other parts of the circuit.
1. THERMOCOUPLE
∙ Principle of Operation
∙ Materials Used
∙ Advantages
∙ Applications
∙ Comparison with RTD
∙ Limitations
By
AnandBongir
GirjashankarMishra
2. A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference.
3. Principle of Operation
Thermocouples are based on the principle that two wires made of dissimilar materials connected at either end will generate a potential between the two ends that is a function of the materials and temperature difference between the two ends (also called the Seebeck Effect).
4. Seebeck Effect
5.
6. Materials Used
Type K:
Chromel – Alumel
• Range: −200 °C to +1350 °C
• Sensi: 41 µV/°C
Type J:
Iron – Constantan
• −40 to +750 °C
• 55 µV/°C
Type E:
Chromel – Constantan
• 401 to 900° C
• 68 µV/°C
Type N:
Nicrosil – Nisil
• >1200 °C
• 39 µV/°C
7. Advantages
It is rugged in construction
Covers a wide temperature range
Using extension leads and compensating cables, long transmission distances for temperature measurement possible. This is most suitable for temperature measurement of industrial furnaces
Comparatively cheaper in cost
Calibration can be easily checked
Offers good reproducibility
High speed of response
Satisfactory measurement accuracy
8. Limitations
For accurate temperature measurements, cold junction compensation is necessary
The emf induced versus temperature characteristics is somewhat nonlinear
Stray voltage pickup is possible
In many applications, amplification of signal is required
9. Applications
Type B, S, R and K thermocouples are used extensively in the steel and iron industries to monitor temperatures and chemistry throughout the steel making process.
Gas-fed heating appliances such as ovens & water heaters.
In the testing of prototype electrical and mechanical apparatus
This Presentation Will Help You To Discover Knowledge About Basic Principles Of Thermocouples. this Presentation Also give You Governing Effect Knowledge & Working Principles Of Thermocouples. In Details You Will Get History and Definitions Of Thermocouples. This Presentation Has Best Diagrams also So that You Can Get Knowledge Easily. At The End You Will See Applications Of Thermocouples In Day to Day Life.
A Thermocouple is a temperature measuring device consisting of two dissimilar conductors that contact each other at one or more spots.
A Thermocouple is a sensor made from two dissimilar metals. When these two metals are fused together at one end they create a junction.
When the junction experiences changes in temperature, a very small voltage is created .which corresponds to a temperature reading.
RTD or Thermocouple; What's the Right Choice?Chuck Bragg
How do you choose when to use an RTD or a Thermocouple to achieve the best temperature measurement? This slide set and the associated notes (RTDology.com) provide guidance and insight.
The thermocouple is a device which converts thermal energy to electrical energy. It is particularly used as a thermosensor. It has wider applications in instrumentation and measurements.
This PPT gathered many relevant topics relating to thermocouple like its working, principle, laws and different types.
Thank you!
A Thermocouple is a sensor used to measure temperature. Thermocouples consist of two wire legs made from different metals. The wires legs are welded together at one end, creating a junction. This junction is where the temperature is measured. When the junction experiences a change in temperature, a voltage is created. The voltage can then be interpreted using thermocouple reference tables to calculate the temperature.
There are many types of thermocouples, each with its own unique characteristics in terms of temperature range, durability, vibration resistance, chemical resistance, and application compatibility. Type J, K, T, & E are “Base Metal” thermocouples, the most common types of thermocouples.Type R, S, and B thermocouples are “Noble Metal” thermocouples, which are used in high temperature applications (see thermocouple temperature ranges for details).
Thermocouples are used in many industrial, scientific, and OEM applications. They can be found in nearly all industrial markets: Power Generation, Oil/Gas, Pharmaceutical, Bio Tech, Cement, Paper & Pulp, etc. Thermocouples are also used in everyday appliances like stoves, furnaces, and toasters.
Thermocouples are typically selected because of their low cost, high temperature limits, wide temperature ranges, and durable nature.
A thermocouple is a temperature-measuring device consisting of two dissimilar conductors that contact each other at one or more spots. It produces a voltage when the temperature of one of the spots differs from the reference temperature at other parts of the circuit.
1. THERMOCOUPLE
∙ Principle of Operation
∙ Materials Used
∙ Advantages
∙ Applications
∙ Comparison with RTD
∙ Limitations
By
AnandBongir
GirjashankarMishra
2. A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference.
3. Principle of Operation
Thermocouples are based on the principle that two wires made of dissimilar materials connected at either end will generate a potential between the two ends that is a function of the materials and temperature difference between the two ends (also called the Seebeck Effect).
4. Seebeck Effect
5.
6. Materials Used
Type K:
Chromel – Alumel
• Range: −200 °C to +1350 °C
• Sensi: 41 µV/°C
Type J:
Iron – Constantan
• −40 to +750 °C
• 55 µV/°C
Type E:
Chromel – Constantan
• 401 to 900° C
• 68 µV/°C
Type N:
Nicrosil – Nisil
• >1200 °C
• 39 µV/°C
7. Advantages
It is rugged in construction
Covers a wide temperature range
Using extension leads and compensating cables, long transmission distances for temperature measurement possible. This is most suitable for temperature measurement of industrial furnaces
Comparatively cheaper in cost
Calibration can be easily checked
Offers good reproducibility
High speed of response
Satisfactory measurement accuracy
8. Limitations
For accurate temperature measurements, cold junction compensation is necessary
The emf induced versus temperature characteristics is somewhat nonlinear
Stray voltage pickup is possible
In many applications, amplification of signal is required
9. Applications
Type B, S, R and K thermocouples are used extensively in the steel and iron industries to monitor temperatures and chemistry throughout the steel making process.
Gas-fed heating appliances such as ovens & water heaters.
In the testing of prototype electrical and mechanical apparatus
This Presentation Will Help You To Discover Knowledge About Basic Principles Of Thermocouples. this Presentation Also give You Governing Effect Knowledge & Working Principles Of Thermocouples. In Details You Will Get History and Definitions Of Thermocouples. This Presentation Has Best Diagrams also So that You Can Get Knowledge Easily. At The End You Will See Applications Of Thermocouples In Day to Day Life.
A Thermocouple is a temperature measuring device consisting of two dissimilar conductors that contact each other at one or more spots.
A Thermocouple is a sensor made from two dissimilar metals. When these two metals are fused together at one end they create a junction.
When the junction experiences changes in temperature, a very small voltage is created .which corresponds to a temperature reading.
RTD or Thermocouple; What's the Right Choice?Chuck Bragg
How do you choose when to use an RTD or a Thermocouple to achieve the best temperature measurement? This slide set and the associated notes (RTDology.com) provide guidance and insight.
esistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions are also used. The RTD wire is a pure material, typically platinum, nickel, or copper. The material has an accurate resistance/temperature relationship which is used to provide an indication of temperature. As RTD elements are fragile, they are often housed in protective probes.
Resistance thermometers are constructed in a number of forms and offer greater stability, accuracy and repeatability in some cases than thermocouples. While thermocouples use the Seebeck effect to generate a voltage, resistance thermometers use electrical resistance and require a power source to operate. The resistance ideally varies nearly linearly with temperature per the Callendar–Van Dusen equation.
The platinum detecting wire needs to be kept free of contamination to remain stable. A platinum wire or film is supported on a former in such a way that it gets minimal differential expansion or other strains from its former, yet is reasonably resistant to vibration. RTD assemblies made from iron or copper are also used in some applications. Commercial platinum grades exhibit a temperature coefficient of resistance 0.00385/°C (0.385%/°C) (European Fundamental Interval).[7] The sensor is usually made to have a resistance of 100 Ω at 0 °C. This is defined in BS EN 60751:1996 (taken from IEC 60751:1995). The American Fundamental Interval is 0.00392/°C,[8] based on using a purer grade of platinum than the European standard. The American standard is from the Scientific Apparatus Manufacturers Association (SAMA), who are no longer in this standards field. As a result, the "American standard" is hardly the standard even in the US.
Lead-wire resistance can also be a factor; adopting three- and four-wire, instead of two-wire, connections can eliminate connection-lead resistance effects from measurements (see below); three-wire connection is sufficient for most purposes and is an almost universal industrial practice. Four-wire connections are used for the most precise applications.
Resistance Temperature Detector
WHAT IS RTD ?
WHY IS RTD USED?
Typical Design
RTD PROBE
Common Resistance materials for RTD
Advantages of RTD
Application OF RTD
Question and Answers
Usage of Platinum
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This document will discuss each of the underlying technologies to create and implement an e- commerce website.
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This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
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accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
3. CONTENT
Resistance/temp. relation of metal
About RTD & Functions
Classifications of RTDs
Construction
Advantages
Limitation
Applications
4. RELATION BETWEEN TEMPERATURE AND
RESISTANCE
Rt = R0[ 1+ X1t + X2t2 ]
X1 & X2 are constant and it is different values for
different metals.
Rt is the resistance of temperature at temperature “t”.
R0 is the resistance of temperature at room
temperature T0.
“t” is the change in temperature.
5. ABOUT RTD & FUNCTIONS
(RTD) – simple temperature sensing tool.
made of conductive material
Work on principle of change of resistance of metal
with respect to temperature
Rise in temperature reduce in resistance of
conductive material
6. RTD TYPES
RTD types are broadly classified according to the different
sensing elements used.(Pt, Ni ,Cu)
Platinum
best metal for process type RTD’s.
withstand oxidation and is effective over a range of –200
to + 850 degrees C.
7. Copper
- The greatest strength of this metal is its low cost.
-measure temperatures as high as 120 degrees C.
Nickel
- good compromise between copper and platinum.
-has a higher output and is slightly less expensive than
platinum.
- extremely nonlinear above 300 degrees C.
9. The simplest type of open wire construction of platinum
resistance thermometer(PRT).
The platinum wire is wound in the form of spirals on an
insulating material such as mica or ceramic.
This assembly is fired at high temperature to assure
annealing of the winding.
The assembly is then placed at the tip of probe as shown in
figure.
This wire is in direct contact with the gas or liquid whose
temperature is to be measured.
10. This gas or liquid however should not be corrosive or
conductive.
The resistance of the platinum wire changes in
temperature of the gas or liquid.
The maximum temperature measurable in continuous
operation is 1000*K i.e. 727*C
This type of sensor have a positive temperature
coefficient of resistivity as they are made from metals.
The wire is direct contact with the gas or liquid whose
temperature is to be measured.
11. The other metal used are nickel and copper.
For many application the platinum resistance wire is
enclosed in a protective tube.
The tube is made of glass, quartz, porcelain or metal.
This protect the resistance wire from any mechanical
damage or chemical reaction.
12. ADVANTAGES
Very high accuracy
Excellent stability and reproducibility
Ability to be matched to close
tolerances for temperature difference
measurements.
Ability to measure narrow spans
Suitability for remote measurement
13. LIMITATION
Susceptibility to mechanical
damage
Need for lead wire resistance
compensation
Susceptibility to self-heating error
Susceptibility to signal noise