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.
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
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
We provide you Project Temperature Sensors – Types.You can choose the best of your choice and interest from the list of topics we suggested. All new project ideas that are appearing focuses to improve the knowledge of Engineering students.
https://www.elprocus.com
Visit our page to get more ideas on Project Report Format for Final Year Engineering Students these ideas developed by professionals.
Elprocus provides free verified electronic projects kits around the world with abstracts, circuit diagrams, and free electronic software. We provide guidance manual for Do It Yourself Kits (DIY) with the modules at best price along with free shipping.
An RTD (Resistance Temperature Detector) is a sensor whose resistance changes as its temperature changes. The resistance increases as the temperature of the sensor increases. The resistance vs temperature relationship is well known and is repeatable over time. An RTD is a passive device. It does not produce an output on its own. External electronic devices are used to measure the resistance of the sensor by passing a small electrical current through the sensor to generate a voltage. Typically 1 mA or less measuring current, 5 mA maximum without the risk of self-heating.
RTDs are built to several standardized curves and tolerances.
The most common standardized curve is the ‘DIN’ curve. The curve describes the resistance vs temperature characteristics of a Platinum, 100 ohm sensor, the standardized tolerances, and the measurable temperature range.
The DIN standard specifies a base resistance of 100 ohms at 0°C, and a temperature coefficient of .00385 Ohm/Ohm/°C. The nominal output of a DIN RTD sensor is shown below:
There are three standard tolerance classes for DIN RTDs. These tolerances are defined as follows:
DIN Class A: ±(0.15 + .002 |T|°C)
DIN Class B: ±(0.3 + .005 |T|°C)
DIN Class C: ±(1.2 + .005 |T|°C)
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
We provide you Project Temperature Sensors – Types.You can choose the best of your choice and interest from the list of topics we suggested. All new project ideas that are appearing focuses to improve the knowledge of Engineering students.
https://www.elprocus.com
Visit our page to get more ideas on Project Report Format for Final Year Engineering Students these ideas developed by professionals.
Elprocus provides free verified electronic projects kits around the world with abstracts, circuit diagrams, and free electronic software. We provide guidance manual for Do It Yourself Kits (DIY) with the modules at best price along with free shipping.
An RTD (Resistance Temperature Detector) is a sensor whose resistance changes as its temperature changes. The resistance increases as the temperature of the sensor increases. The resistance vs temperature relationship is well known and is repeatable over time. An RTD is a passive device. It does not produce an output on its own. External electronic devices are used to measure the resistance of the sensor by passing a small electrical current through the sensor to generate a voltage. Typically 1 mA or less measuring current, 5 mA maximum without the risk of self-heating.
RTDs are built to several standardized curves and tolerances.
The most common standardized curve is the ‘DIN’ curve. The curve describes the resistance vs temperature characteristics of a Platinum, 100 ohm sensor, the standardized tolerances, and the measurable temperature range.
The DIN standard specifies a base resistance of 100 ohms at 0°C, and a temperature coefficient of .00385 Ohm/Ohm/°C. The nominal output of a DIN RTD sensor is shown below:
There are three standard tolerance classes for DIN RTDs. These tolerances are defined as follows:
DIN Class A: ±(0.15 + .002 |T|°C)
DIN Class B: ±(0.3 + .005 |T|°C)
DIN Class C: ±(1.2 + .005 |T|°C)
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
(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)
Developing an experimental set up for measurement of cutting temperature in T...HIMANSHU KUMAR SINGH
• Developed an experimental set up for measurement of cutting temperature in Turning Operation
• Design (in SolidWorks) and implementation of a miniature device for measuring temperature at cutting point for lathes and CNC’s
• Analysed varies exiting technology and made the advanced, accurate, low cost and easy to use temperature measuring device.
• The tool-work thermocouple measurement technique is an economic and fairly accurate technique of temperature measurement
In thermogravimetric analysis, the change in weight in
relation to a change in temperature in a controlled environment is measured. Heat is used in TGA to force
reactions and physical changes in materials. Thermogravimetric analysis (TGA) is a reliable method to determine
endotherms, exotherms, measure oxidation processes, thermal stability, decomposition points of explosives,
characteristics of polymers, solvent residues, the level of organic and inorganic components of a mixture,
degradation temperatures of a material, and the absorbed moisture content of materials. Materials analyzed by
thermogravimetric analysis include explosives, petroleum, chemicals, biological samples, polymers, composites,
plastics, adhesives, coatings, organic materials, and pharmaceuticals.The thermogravimetric analysis instrument usually consists of a high-precision balance and sample pan.
The pan holds the sample
material and is located in a
furnace or oven that is
heated or cooled during the
experiment. A thermocouple
is used to accurately control
and measure the
temperature within the oven.
The mass of the sample is
constantly monitored during
the analysis. An inert or
reactive gas may be used to
purge and control the
environment. The analysis is
performed by gradually
raising the temperature and plotting the
substances weight against temperature. A
computer is utilized to control the
instrument and to process the output
curves.
Spectroscopy is the measurement and interpretation of electromagnetic radiation absorbed or emitted when the molecules or atoms or ions of a sample move from one energy state to another energy state. UV spectroscopy is a type of absorption spectroscopy in which light of the ultra-violet region (200-400 nm) is absorbed by the molecule which results in the excitation of the electrons from the ground state to a higher energy state.Basically, spectroscopy is related to the interaction of light with matter.
As light is absorbed by matter, the result is an increase in the energy content of the atoms or molecules.
When ultraviolet radiations are absorbed, this results in the excitation of the electrons from the ground state towards a higher energy state.
Molecules containing π-electrons or nonbonding electrons (n-electrons) can absorb energy in the form of ultraviolet light to excite these electrons to higher anti-bonding molecular orbitals.
The more easily excited the electrons, the longer the wavelength of light they can absorb. There are four possible types of transitions (π–π*, n–π*, σ–σ*, and n–σ*), and they can be ordered as follows: σ–σ* > n–σ* > π–π* > n–π* The absorption of ultraviolet light by a chemical compound will produce a distinct spectrum that aids in the identification of the compound.
Medical devices are heavily regulated because of their
intended uses in human beings. Generally medical devices
are classified into different categories depending upon the
degree of potential risks and regulated accordingly.Many medical devices are involved with relative moving parts,
either in contact to the native tissues or within the biomaterials,
and often under loading. Important issues, such as friction and
wear of the moving parts, not only affect the functions of these
devices but also the potential adverse effects on the natural tissues.
Biotribology deals with the application of tribological principles,
such as friction, wear and lubrication between relatively motions
surfaces, to medical and biological systems. Biotribology plays an important role in a number of medical devices
Protein based nanostructures for biomedical applications karoline Enoch
Proteins are kind of natural molecules that show unique
functionalities and properties in biological materials and
manufacturing feld. Tere are numerous nanomaterials
which are derived from protein, albumin, and gelatin. Tese
nanoparticles have promising properties like biodegradability, nonantigenicity, metabolizable, surface modifer, greater
stability during in vivo during storage, and being relatively
easy to prepare and monitor the size of the particles.
These particles have the ability to attach covalently with
drug and ligand
A Schering Bridge is a bridge circuit used for measuring an unknown electrical capacitance and its dissipation factor. The dissipation factor of a capacitor is the the ratio of its resistance to its capacitive reactance. The Schering Bridge is basically a four-arm alternating-current (AC) bridge circuit whose measurement depends on balancing the loads on its arms .
A Maxwell bridge is a modification to a Wheatstone bridge used to measure an unknown inductance (usually of low Q value) in terms of calibrated resistance and inductance or resistance and capacitance. When the calibrated components are a parallel resistor and capacitor, the bridge is known as a Maxwell-Wien bridge. It is named for James C. Maxwell, who first described it in 1873.
It uses the principle that the positive phase angle of an inductive impedance can be compensated by the negative phase angle of a capacitive impedance when put in the opposite arm and the circuit is at resonance; i.e., no potential difference across the detector (an AC voltmeter or ammeter)) and hence no current flowing through it. The unknown inductance then becomes known in terms of this capacitance.
A Kelvin bridge, also called a Kelvin double bridge and in some countries a Thomson bridge, is a measuring instrument used to measure unknown electrical resistors below 1 ohm. It is specifically designed to measure resistors that are constructed as four terminal resistors.
Dc bridge types ,derivation and its applicationkaroline Enoch
The DC Bridge is used for measuring the unknown electrical resistance. This can be done by balancing the two legs of the bridge circuit. The value of one of the arm is known while the other of them is unknown
The bridge uses for measuring the value of unknown resistance, inductance and capacitance, is known as the AC Bridge. The AC bridges are very convenient and give the accurate result of the measurement.The construction of the bridges is very simple. The bridge has four arms, one AC supply source and the balance detector. It works on the principle that the balance ratio of the impedances will give the balance condition to the circuit which is determined by the null detector.
Photodynamic therapy (PDT) is a two-stage treatment that combines light energy with a drug (photosensitizer) designed to destroy cancerous and precancerous cells after light activation. Photosensitizers are activated by a specific wavelength of light energy, usually from a laser.
Preamplifier and impedance matching circuitskaroline Enoch
A preamplifier circuit with a very low noise characteristic can be built by simply combining a FET transistor with a bipolar one. The input impedance of the preamp circuit is almost the same as the gate impedance of the FET transistor (around 1MΩ) The output impedance at the other end is about 1KΩ.
Phototherapy is a type of medical treatment that involves exposure to fluorescent light bulbs or other sources of light like halogen lights, sunlight, and light emitting diodes (LEDs) to treat certain medical conditions
The word “laser” is an acronym for light amplification by stimulated emission of radiation. Most sources of visible light radiate energy at different wavelengths (ie, different colors) and at random time intervals (noncoherent). The unique properties of laser energy are monochromaticity (single wavelength), spatial coherence, and high density of electrons. These allow focusing of laser beams to extremely small spots with very high-energy densities.
A laser consists of a transparent crystal rod (solid-state laser), or a gas- or liquid-filled cavity (gas or fluid laser) constructed with a fully reflective mirror at one end and a partially reflective mirror at the other. Surrounding the rod or cavity is an optical or electrical source of energy that will raise the energy level of the atoms within the rod or cavity to a high and unstable level, a process known as population inversion. When the excited atoms spontaneously decay back to a lower-energy level, their excess energy is released in the form of light. This light can be emitted in any direction. In a laser cavity, however, light emitted along the long axis of the cavity can bounce back and forth between the mirrors, setting up a standing wave that stimulates the remaining excited atoms to release their energy into the standing wave, producing an intense beam of light that exits the cavity through the partially reflective mirror. All of the light produced has the same wavelength (monochromatic) and phase (coherent), with little tendency to spread out (low divergence). The laser light energy can be emitted continuously or in pulses, which may have pulse durations of nanoseconds or less.
he ability of the laser to ablate prostatic tissue with minimal hemorrhage has concentrated most of the interest in urologically applied lasers to benign prostatic hyperplasia (BPH) [Anson et al. 1994]. Despite tremendous advances in the surgical and minimally invasive treatment of BPH, transurethral resection of the prostate (TURP) is still considered the ‘gold standard’. The risks of TURP are always mentioned when discussing the reasons for seeking alternative treatment modalities for BPH. Bleeding certainly remains a concern, especially in patients on some form of anticoagulation (heparin, coumarin related compounds, antiplatelet agents) or those with prostates in excess of 60–80 g. On the other hand, with the availability of transurethral resection in saline (TURiS), the TURP syndrome is nowadays considered by many to be a relatively rare complication
Lasers have been used successfully to treat a variety of vascular lesions including superficial vascular malformations (port-wine stains), facial telangiectases, haemangiomas, pyogenic granulomas, Kaposi sarcoma and poikiloderma of Civatte. Lasers that have been used to treat these conditions include argon, APTD, KTP, krypton, copper vapour, copper bromide, pulsed dye lasers and Nd:YAG. Argon (CW) causes a high degree of non-specific thermal injury and scarring and is now largely replaced by yellow-light quasi-CW and pulsed laser therapies.
The pulsed dye laser is considered the laser of choice for most vascular lesions because of its superior clinical efficacy and low-risk profile. It has a large spot size (5 to 10mm) allowing large lesions to be treated quickly. Side effects include postoperative bruising (purpura) that may last 1-2 weeks and transient pigmentary changes. Crusting, textural changes and scarring are rarely seen.
The term LASER is an acronym for ‘Light Amplification by the Stimulated Emission of Radiation’. As its first application in dentistry by Miaman, in 1960, the laser has seen various hard and soft tissue applications. In the last two decades, there has been an explosion of research studies in laser application. In hard tissue application, the laser is used for caries prevention, bleaching, restorative removal and curing, cavity preparation, dentinal hypersensitivity, growth modulation and for diagnostic purposes, whereas soft tissue application includes wound healing, removal of hyperplastic tissue to uncovering of impacted or partially erupted tooth, photodynamic therapy for malignancies, photostimulation of herpetic lesion. Use of the laser proved to be an effective tool to increase efficiency, specificity, ease, and cost and comfort of the dental treatment.
Photolithography, also called optical lithography or UV lithography, is a process used in microfabrication to pattern parts on a thin film or the bulk of a substrate (also called a wafer). It uses light to transfer a geometric pattern from a photomask (also called an optical mask) to a photosensitive (that is, light-sensitive) chemical photoresist on the substrate. A series of chemical treatments then either etches the exposure pattern into the material or enables deposition of a new material in the desired pattern upon the material underneath the photoresist. In complex integrated circuits, a CMOS wafer may go through the photolithographic cycle as many as 50 times.
Photolithography shares some fundamental principles with photography in that the pattern in the photoresist etching is created by exposing it to light, either directly (without using a mask) or with a projected image using a photomask. This procedure is comparable to a high precision version of the method used to make printed circuit boards. Subsequent stages in the process have more in common with etching than with lithographic printing. This method can create extremely small patterns, down to a few tens of nanometers in size. It provides precise control of the shape and size of the objects it creates and can create patterns over an entire surface cost-effectively. Its main disadvantages are that it requires a flat substrate to start with, it is not very effective at creating shapes that are not flat, and it can require extremely clean operating conditions. Photolithography is the standard method of printed circuit board (PCB) and microprocessor fabrication. Directed self-assembly is being evaluated as an alternative to photolithography
The Piezoelectric transducer is an electroacoustic transducer use for conversion of pressure or mechanical stress into an alternating electrical force. It is used for measuring the physical quantity like force, pressure, stress, etc., which is directly not possible to measure.The piezo transducer converts the physical quantity into an electrical voltage which is easily measured by analogue and digital meter.
The piezoelectric transducer uses the piezoelectric material which has a special property, i.e. the material induces voltage when the pressure or stress applied to it. The material which shows such property is known as the electro-resistive element
Photoelectric transducers and its classificationkaroline Enoch
The photoelectric transducer converts the light energy into electrical energy. It is made of semiconductor material. The photoelectric transducer uses a photosensitive element, which ejects the electrons when the beam of light absorbs through it.
Piezoresistive pressure sensors are one of the very-first products of MEMS technology. Those products are widely used in biomedical applications, automotive industry and household appliances.
The sensing material in a piezoresistive pressure sensor is a diaphragm formed on a silicon substrate, which bends with applied pressure. A deformation occurs in the crystal lattice of the diaphragm because of that bending. This deformation causes a change in the band structure of the piezoresistors that are placed on the diaphragm, leading to a change in the resistivity of the material. This change can be an increase or a decrease according to the orientation of the resistors.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
2. RTD
• RTD stands for Resistance Temperature Detector.
• RTDs are sometimes referred to generally as
resistance thermometers.
• The American Society for Testing and Materials
(ASTM) has defined the term resistance
thermometer as follows:
• Resistance thermometer, n. - a temperature-
measuring device composed of a resistance
thermometer element, internal connecting wires, a
protective shell with or without means for
mounting a connection head, or connecting wire or
other fittings,
2
3. PRINCIPLE
• An RTD is a temperature sensor which measures temperature
using the principle that the resistance of a metal changes with
temperature.
• In practice, an electrical current is transmitted through a piece
of metal (the RTD element or resistor) located in proximity to
the area where temperature is to be measured.
• The resistance value of the RTD element is then measured by an
instrument.
• This resistance value is then correlated to temperature based
upon the known resistance characteristics of the RTD element
3
4. • TDs work on a basic correlation between metals and
temperature.
• As the temperature of a metal increases, the metal's resistance to
the flow of electricity increases.
• Similarly, as the temperature of the RTD resistance element
increases, the electrical resistance, measured in ohms (Ω),
increases.
4
5. COMMON COMPONENTS OF RTD
• RTD platinum resistance element
• RTD Tubing Material
• RTD Process Connection
• RTD Wire Configuration
• RTD cold end termination
5
6. RTD PLATINUM RESISTANCE ELEMENT:
• This is the actual temperature sensing portion of the RTD.
Elements range in length from 1/8″ to 3″.
• The standard temperature coefficient is an alpha of .00385 and
the standard resistance is 100 Ω at 0° C.
6
7. RTD OUTSIDE DIAMETER
• The most common outside diameter is ¼” in the US or 6mm
(.236″) for non-US applications.
• However, outside diameters range from .063″ to .500″
7
8. RTD PROCESS CONNECTION:
Process connection fittings include all standard fittings used with
thermocouples (i.e. compression, welded, spring-loaded, etc.).
8
9. RTD WIRE CONFIGURATION
• RTDs are available in 2, 3 and 4 wire configuration.
• 3 wire configurations are the most common for industrial
applications.
• Teflon and fiberglass are the standard wire insulation materials.
• Teflon is moisture resistant and can be used up to 400° F.
Fiberglass can be used up to 1000° F.
9
10. RTD COLD END TERMINATION
• RTDs can terminate on the cold end with plugs, bare wires,
terminal heads and any of the reference junctions common to
thermocouples.
10
11. RTD ELEMENTS
• RTD elements are commonly specified according to their resistance in ohms
at zero degrees Celsius .
• The most common RTD specification is 100 Ω, which means that at 0o C the
RTD element should demonstrate 100 Ω of resistance.
• Platinum is the most commonly used metal for RTD elements due to a
number of factors, including its
• Chemical inertness,
• linear temperature versus resistance relationship,
• Temperature coefficient of resistance that is large enough to give readily measurable
resistance changes with temperature and
• Stability (in that its temperature resistance does not drastically change with time).
• Other metals that are less frequently used as the resistor elements in an
RTD include nickel, copper and Balco.
11
13. CONFIGURATION OF RTD
RTD elements are typically in one of three configurations:
• A platinum or metal glass slurry film deposited or screened onto a
small flat ceramic substrate known as "thin film" RTD elements, and
• Platinum or metal wire wound on a glass or ceramic bobbin and
sealed with a coating of molten glass known as "wire wound" RTD
elements.
• A partially supported wound element which is a small coil of wire
inserted into a hole in a ceramic insulator and attached along one
side of that hole. Of the three RTD elements, the thin film is most
rugged and has become increasingly more accurate over time
13
14. PLATINUM RTDS
• Platinum RTDs are the most common type of RTD used in
industrial applications.
• This is because platinum has excellent corrosion resistance,
excellent long-term stability, and measures a wide range of
temperature, (-200…+850°C).
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15. NICKEL RTDS
• Nickel RTDs are less expensive than platinum and have good
corrosion resistance.
• However, nickel ages more rapidly over time and loses accuracy
at higher temperatures.
• Nickel is limited to a measurement range of -80…+260°C.
15
16. COPPER RTDS
• Copper RTDs have the best resistance to temperature linearity of
the three RTD types, and copper is a low cost material.
• However, copper oxidizes at higher temperatures.
• Copper is limited to a measurement range of -200…+260°C
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17. WIRE WOUND RTD
• In a wire wound RTD, a resistance wire
is wound around a non-conducting core,
which is usually made of ceramic.
• The sensor maker carefully trims the
length of resistance wire to achieve the
specified resistance at 0°C. This is called
the “R0” resistance.
• Next, lead wires are attached to the
resistance wire, and then a glass or
ceramic coating is applied over the wire
for protection.
• As temperature increases, the length of
resistance wire increases slightly.
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18. • Care must be taken in the design to ensure that the resistance
wire does not twist or otherwise deform as temperature
increases.
• This is because mechanical strain causes a change in wire
resistance.
• Laboratory-grade RTDs used by calibration and standards
laboratories eliminate this source of error by loosely winding
resistance wire around a non-conducting support structure.
• This type of RTD can be extremely accurate, but is fragile and not
suited for most industrial applications.
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19. COILED ELEMENT RTD
• In a coiled element RTD, the resistance
wire is rolled into small coils, which
loosely fit into a ceramic form that is
then filled with non-conductive
powder.
• The resistance wire is free to expand
and contract as temperature changes,
minimizing error caused by
mechanical strain.
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20. • The powder increases the rate of heat transfer into the coils,
thereby improving the response time.
• Coiled element RTDs are usually protected by a metal sheath and
are used in industrial applications
20
21. THIN FILM RTDS
• Thin film RTDs are mass-produced and
cost less than the other RTD types.
• They are smaller, and have a faster
response time than the others, which is
desirable in many applications.
• They are made by depositing a thin
pathway of platinum on a ceramic base.
• The manufacturer adjusts the
resistance at 0°C by opening parallel
shunts in the pathway with a laser
beam.
• The more shunts are opened, the
higher is the resistance at 0°C
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22. Thin film RTDs are not as accurate as the other types because:
The R0 resistance cannot be adjusted as precisely as in the other
types.
The ceramic base and platinum coating have slightly different
expansion rates.
This creates a strain error at higher temperatures.
Because thin film RTDs are smaller, the RTD excitation current
causes a slightly higher error due to RTD self-heating.
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23. RTD RESISTANCE RATIO
• The term “resistance ratio” describes the average slope of
temperature vs. resistance as the RTD temperature changes from 0°C
to +100°C. The expression for resistance ratio is
(R100-R0) / R0
Where:
• R100 RTD Resistance at 100°C.
• R0 = RTD Resistance at 0°C.
Resistance ratio is affected by the type and purity of the metal used to
make the RTD
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24. CHARACTERISTICS OF RTD ELEMENT
Temperature Coefficient
Nominal Resistance
Temperature Range of Application
Physical Dimensions or Size
Restrictions
Accuracy
24
25. MATERIAL OF RESISTANCE ELEMENT
• Several metals are quite common for use in resistance elements
and the purity of the metal affects its characteristics.
• Platinum is by far the most popular due to its linearity with
temperature.
• Other common materials are nickel and copper, although most
of these are being replaced by platinum elements.
• Other metals used, though rarely, are Balco (an iron-nickel alloy),
tungsten and iridium
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26. TEMPERATURE COEFFICIENT
• The temperature coefficient of an element is a physical and
electrical property of the material.
• This is a term that describes the average resistance change per
unit of temperature from ice point to the boiling point of water
NOMINAL RESISTANCE
Nominal Resistance is the prespecified resistance value at a given
temperature
26
27. TEMPERATURE RANGE OF APPLICATION
• Depending on the mechanical configuration and manufacturing
methods, RTD’s may be used from -270oC to 850oC.
• Specifications for temperature range will be different, for thin
film, wire wound and glass encapsulated types
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28. PHYSICAL DIMENSIONS
The most critical dimension of the element is outside diameter
(O.D.), because the element must often fit within a protective
sheath
ACCURACY
IEC 751 specifications for Platinum Resistance Thermometers
have adopted DIN 43760 requirements for accuracy
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29. APPLICATIONS OF RTD
• RTD sensor is used in automotive to measure the engine
temperature, an oil level sensor, intake air temperature sensors.
• In communication and instrumentation for sensing the over the
temperature of amplifiers, transistor gain stabilizers, etc
• RTD is used in power electronics, computer, consumer
electronics, food handling and processing, industrial electronics,
medical electronics, military, and aerospace.
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30. APPLICATIONS OF RTD
Power electronics,
Computer,
Consumer electronics,
Food handling and processing,
Industrial electronics
Medical electronics
Military
Aerospace.
30
31. THERMISTORS
• Thermistor is special type of resistor, whose resistance varies
more significantly with temperature than in standard
resistors.
• Generally, the resistance increases with the temperature for
most of the metals but the thermistors respond negatively i.e.
the resistance of the thermistors decrease with the increase
in temperature.
• This is the main principle behind thermistor.
• As the resistance of thermistors depends on the temperature,
they can be connected in the electrical circuit to measure the
temperature of the body.
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32. • Thermistors are mainly used as temperature sensors, inrush current limiters, self-
resetting over-current protectors and self-regulating heating elements.
• A thermistor is made from a semiconductor material.
• It is shaped into a disc, a rod or a bead.
• Bead thermistors may be only a few millimetres in diameter.
• Some bead thermistors have the bead enclosed in a glass capsule.
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34. • In PTC type thermistor, resistance increase with increase in
temperature. Whereas in NTC thermistor, resistance decrease
with increase in temperature.
• Pure metals have positive temperature coefficient (PTC) of
resistance, alloys have nearly equal zero temperature coefficient
of resistance and semi conductors have negative temperature
coefficient (NTC) of resistance.
• PTC thermistors can be used as heating elements in small
temperature controlled ovens. NTC thermistors can be used as
inrush current limiting devices in power supply circuits.
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35. FEATURES OF THERMISTOR
• Thermistors are at least 10 times as sensitive as the platinum
Resistance temperature detector (RTD).
• This high sensitivity of thermistors is very useful for precision
temperature measurement, control and compensation.
• Although thermistors are very sensitive but on the other hand, it
exhibits highly non-linear characteristics of resistance versus
temperature.
• Thermistors are available in variety of sizes and shapes
• Thermistors are compact and rugged in construction.
• It is widely used in the application where temperature measurements
ranges -60 °C to 15 °C.
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36. THERMISTOR CHARACTERISTICS
• Resistance increase with increase in
temperature for PTC and Resistance
decrease with increase in temperature
for NTC.
• The thermistor exhibits a highly non-
linear characteristic of resistance vs
temperature.
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37. CONTD..
• There are two fundamental ways to change the temperature of
thermistor internally or externally.
• The temperature of thermistor can be changed externally by
changing the temperature of surrounding media and internally
by self-heating resulting from a current flowing through the
device.
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38. THERMISTOR APPLICATIONS
• Thermistors are used in circuits to control temperature.
• They are used to compensate for the effects of temperature on
conductor or circuit performance.
• It is used in the measurement of power at high frequencies.
• Thermistors are used to provide time delay in circuits.
• It is used in the measurement of thermal conductivity.
• It is used in the measurement of composition of gases.
• Thermistors are used for the measurement of level, flow, and
pressure of liquids.
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39. CONTD..
• PTC thermistors were used as timers in the degaussing coil circuit of most
CRT displays.
• A degaussing circuit using a PTC thermistor is simple, reliable (for its
simplicity), and inexpensive.
• PTC thermistors used as heater in automotive industry to provide
additional heat inside cabin with diesel engine or to heat diesel in cold
climatic conditions before engine injection.
• PTC thermistors used as current-limiting devices for circuit protection, as
replacements for fuses.
• NTC thermistors used to monitor the temperature of an incubator.
• Thermistors are also commonly used in modern digital thermostats and to
monitor the temperature of battery packs while charging.
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40. CONTD..
• NTC thermistors are used in the Food Handling and Processing
industry, especially for food storage systems and food
preparation. Maintaining the correct temperature is critical to
prevent food borne illness.
• NTC thermistors are used throughout the Consumer Appliance
industry for measuring temperature. Toasters, coffee makers,
refrigerators, freezers, hair dryers, etc. all rely on thermistors for
proper temperature control.
• Hot ends of 3D printers; they monitor the heat produced and
allow the printer’s control circuitry to keep a constant
temperature for melting the plastic filament.
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41. CONTD..
• NTC thermistors are used as resistance thermometers in low-
temperature measurements of the order of 10 K.
• NTC thermistors can be used as inrush-current limiting devices
in power supply circuits.
41