This document discusses various methods for measuring temperature. It describes bimetallic thermometers, liquid-in-glass thermometers, resistance temperature detectors (RTDs), and pyrometers. Bimetallic thermometers use the different expansion rates of two metals to measure temperature, while liquid-in-glass thermometers rely on the expansion of liquid in a glass tube. RTDs precisely measure temperature through changes in electrical resistance. Pyrometers determine temperature by comparing the brightness of radiation from an object to a reference light source. Each method has advantages like accuracy, but also limitations such as measurement range or susceptibility to damage.
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
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 can be used by the Students of Engineering who Deals with the Subject INDUSTRIAL INSTRUMENTATION and use it for Refrence (Anyways you Guys will Copy Paste or Download it) ;)
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
In this presentation we have discussed about temperature measuring instruments used in industry. Like Mechanical , electrical and non contact types instruments for measuring temperature
Discussing what is temperature. How to calibrate a thermometer. Liquid in glass thermometers. Calibrate a liquid-in-glass thermometer using two fixed points. Characteristics of a quality/ good thermometer.
This Presentation can be used by the Students of Engineering who Deals with the Subject INDUSTRIAL INSTRUMENTATION and use it for Refrence (Anyways you Guys will Copy Paste or Download it) ;)
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
In this presentation we have discussed about temperature measuring instruments used in industry. Like Mechanical , electrical and non contact types instruments for measuring temperature
Discussing what is temperature. How to calibrate a thermometer. Liquid in glass thermometers. Calibrate a liquid-in-glass thermometer using two fixed points. Characteristics of a quality/ good thermometer.
various types of temperature measuring instrument
1.expansion types
i)bimetallic strips
ii)liquid in gas
2.based on electric resistivity
i)thermocouple
ii)thermistors(most sensitivity)
3.pyrometers
i)mirror types
ii)optical
iii)photon types(not exact names:-based on collection of photon)
and one interesting term include in pyrometers is THERMOPILE:A large number of themocouple connected in series.Hopes so you all will enjoy
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
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.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
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.
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CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
1. L.J. Institute of Engg. & Technology
Temperature
measurement
Name: Sandeep
Singh Vasir
En,no:13032011953
9
Division:ME-C2
Subject in charge:
Sir.Mehul V.Kediya
2. Temperature measurement
The following characteristics can be used to
measure the temperature
A change in dimentions - expansion or
contraction of material w.r.t. Temp change
A change in electrical resistance of metals and
semi-conductors w.r.t. Temp change
A thermo-electric emf produced due to temp
difference at two junctions of two metal alloy
joined together
A change in intensity and colour of radiation
emitted by the hot body w.r.t to change in
temp
3. Temperature is a measure of the
thermal energy in the body.
Normally measured in degrees [°]using
one of the following scales.
1. Fahrenheit.[°F]
2. Celsius or centigrade. [°C]
3. Kelvin .[°K]
Scale
5. (1)Bimetallic Thermometer
Two basic principles of operation
is to be followed in the case of
a bimetallic sensor.
1) A metal tends to undergo a
volumetric dimensional
change
(expansion/contraction),
according to the change in
temperature.
2) Different metals have
different co-efficient of
temperatures. The rate of
volumetric change depends
on this co-efficient of
temperature.
6. Device consists of a bimetallic strip of two different metals .
•
They are bonded together to form a spiral or a twisted helix.
•
Both these metals are joined together at one end by either
welding or riveting.
•
It is bonded so strong that there will not be any relative
motion between the two.
. The image of a bimetallic strip is shown below.
7. Working
A change in temperature causes the free end of the strip to
expand or contract due to the different coefficients of
expansion of the two metals.
This movement is linear to the change in temperature and
the deflection of the free end can be read out by attaching a
pointer to it.
This reading will indicate the value of temperature.
Bimetallic strips are available in different forms like helix
type, cantilever, spiral, and also flat type.
8. Advantages
1) Power source not required
2) Robust, easy to use and cheap.
3) Can be used to 500 °C.
Disadvantages
1) Not very accurate.
2) Limited to applications where manual reading is
acceptable.
3) Not suitable for very low temperatures because the
expansion of metals tend to be too similar, so the device
becomes a rather insensitive thermometer
9. (2)Liquid – in – Glass
Thermometer
Construction
1.Bulb: The reservoir for containing most of the
thermometric liquid (mercury).
2.Stem: The glass tube having a capillary bore
along which the liquid moves with changes
in temperature.
3. Scale: A narrow-temperature-range scale for
reading a reference temperature .
10. •
The volume of mercury changes slightly with temperature; the small change
in volume drives the narrow mercury column a relatively long way up the
tube.
•
The space above the mercury may be filled with nitrogen or it may be at
less than atmospheric pressure, a partial vacuum.
Advantages
1) Simplicity in use & low cost.
2) Portable device.
3) Checking physical damage is easy.
4) Power source not require
Disadvantages
1) Can not used for automatic recording.
2) Time lag in measurement.
3) Range is limited to about 300 °C .
12. Resistance Temperature Detector (RTD)
the resistance of RTD
changes proportionally
When the temp of an
object changes
Platinum, nickel and
copper are the commonly
used sensing elements
13.
Advantages
Very high accuracy, excellent stability and interchangeability
Ability to measure narrow spans, suitable for remote measurement
Disadvantages
Susceptibility to
mechanical damage,
self-heating error,
signal noise
Unsuitability for bare
use in electrically
conducting substance
expensive
14. Pyrometer
It measures the amount of heat that is radiated from an object.
The device compares the brightness produced by the radiation of the object
whose temp is to be measured
An eye piece at the left side and
an optical lens on the right
A reference lamp
A rheostat to change the
current and brightness
An absorption screen is fitted
between the optical lens and
the reference bulb, so as to
increase the temp range
15. Working
1.The radiation from the source is emitted and the
optical objective lens captures it.
2.The lens helps in focusing the thermal radiation on to the
reference bulb.
3.The observer watches the process through the eye piece
and corrects it in such a manner that the reference lamp
filament has a sharp focus and the filament is super-imposed
on the temperature source image.
4.The observer starts changing the rheostat values and the
current in the reference lamp changes.
5.This in turn, changes its intensity.
This change in current can be observed in three different ways.
16. The filament is dark. That is, cooler than the
temperature source.
Filament is bright. That is, hotter than the
temperature source.
Filament disappears. Thus, there is equal
brightness between the filament and
temperature source
17. •
Advantages
1. Provides a very high accuracy with +/-5º Celsius.
2. The biggest advantage of this device is that, there is no direct
contact between the pyrometer and the object whose
temperature is to be found out.
•
Disadvantages
1. As the measurement is based on the light intensity, the device
can be used only in applications with a minimum temperature of
700º Celsius.
2. The device is not useful for obtaining continuous values of
temperatures at small intervals.