The ages of your household members, as well as personal preference, can help you determine which types to buy. surface weather stations, and bimetallic thermometers are used in radiosondes. Measurement can only be made at measurement point, Enables long-distance temperature measurement (via capillary), Source: https://www.wika.com/en-en/startpage.WIKA. Nearly linear response to temperature change. Environmentally-friendly thermometers are preferred over mercury-in-glass types. Definition: A thermometer which uses two different metal strips for converting the displacement of temperature into mechanical. This metal has no relative motion and this strip can be made from steel, copper, and brass, etc. No-touch forehead thermometers usually have a removable cap that keeps it clean during storage. There are many types, including oral, rectal, and forehead, plus many that. We avoid using tertiary references. It uses a bimetal to convert the temperature of the medium into mechanical displacement. measure temperature variations over a distance of less than 1 cm, material In the industrial economy and in everyday life we measure temperature somewhere. Due to this property, when the temperature changes, the metal strip at one side expands and the other does not, which creates a bending effect. non-uniformity of the bore of the capillary tube, which means that equal intervals marked on the stem do not correspond to equal temperature intervals. A mechanical element used to sense temperature & change it into a mechanical displacement is known as a bimetallic strip. If a mercury in glass thermometer is used, the observed firing temperature and the final temperature must be corrected as prescribed by the certificate issued with the instrument. A weekly or monthly thermometer calibration process should be put in place depending on your application requirements. 2. The pointer is connected by a shaft at the free end of the strip. Learn when you should see a doctor about a fever. As the temperature decreases, the metal with a lower thermal coefficient forms the inner layer of the arc. The strip metal, which has a high coefficient of thermal expansion, expands and coils up along the stem, which causes the shaft to rotate. How to Change Ring Doorbell Sound Outside? Alcohol-filled thermometers are less accurate but are preferred in many applications because of the highly toxic nature of mercury if a thermometer is broken. Mayo Clinic Staff. of emitting surface needs to be known, affected Check on regular intervals to ensure accuracy. 28). The two metals typically used are steel and copper, but steel and brass can also be used. Bridge circuit is needed with power supply. They must be positioned properly in order to get accurate results. Make sure to hold the thermometer steady. The bimetallic thermometers are used for residential as well as commercial purposes. The change in the temperature of the strip causes its contraction and expansion. This price advantage is due to their simpler construction. Helix strip type is used in refinery, tire vulcanized, oil burners. Web6.3.1 Advantages and Challenges of Luminescent Nanoprobes Liquid-filled and bimetallic thermometers, thermocouples, pyrometers, and thermistors, are classified as contact thermometers and are generally not appropriate for temperature determination at scales below 10 m [29, 3136]. Alcohol is also used with this type of instrument. Table 3 gives the monthly mean values of temperature maxima and minima for the solar and control rooms along with the ambient both for greenhouse and trombe systems. As the temperature increases, the two metal strips expand differently. WebThe advantages of bimetallic thermometers include: Simple and robust design Less expensive than other thermometers They are fully mechanical and do not require any power source to operate. The bimetal thermometer works by using two basic properties of metals. Full-immersion thermometers are not suitable for placement in a thermowell. Depending on the requirements of your application, a weekly or monthly thermometer calibration process should be implemented. If the thermometer is accurate, it should measure 0C or 32F. Thermal expansion is the property of a metal to change its shape or volume in response to a change in temperature. Most free phone apps designed to take temperature readings are meant for recording the temperature of environments, not people. Working Principle of Bimetallic Thermometer: #1. Compared to gas-actuated thermometers, bimetal thermometers are much cheaper in terms of price. This bending motion is connected to a dial on the thermometer that outputs the temperature of the medium. It consists of a sealed glass tube with a small internal diameter (like a lumen) connected to a reservoir. For instance, mercury thermometers are the standard equipment at Cover the tip of the thermometer with a plastic sheath and apply lubricant, such as petroleum jelly or a water-based lubricant such as K-Y jelly. Definition: A thermometer is a device that uses two different metal strips to convert temperature displacement into mechanical. Michael Carr, Eabhnat N Fhloinn, in Calculus for Engineering Students, 2020, A mercury in glass thermometer is dipped into a liquid (which can be considered as a step input) at a temperature TL of 70C. Electrical Deck is a platform for learning all about electrical and electronics engineering. These are mostly used for industrial applications, as they can be placed inside a thermowell which provides operation in high temperature and pressure environments. The applications of bimetallic thermometer are. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'electricaldeck_com-box-3','ezslot_10',107,'0','0'])};__ez_fad_position('div-gpt-ad-electricaldeck_com-box-3-0');The bimetallic thermometer is a temperature sensor used for the measurement of temperature. When should you break a fever, and when should you let it run its course? MONTHLY MEAN OF MEASURED TEMPERATURES SOS VILLAGE, LEH, Alan S. Morris, Reza Langari, in Measurement and Instrumentation (Third Edition), 2021. Calibration is an important step to ensure correct temperature readings. Feel free to contact us! Advantages of Bimetallic Thermometer : Since the scale is calibrated in terms of temperature we can take the readings easily and directly. Generally, bimetal thermometers consist of a metal stem encasing a coil of two different metals bonded together to a temperature indicator at the head. The helically shaped strips are widely used in oil burners, refineries, hot solder tanks, tire vulcanizers, tempering tanks, hotwire heaters etc. Temperature is the most frequently measured factor in industrial and commercial settings. A pointer in this thermometer can be connected to the higher side of the metal rod. Calibration is disturbed if roughly handled. It is affected by shock and vibration. The cost is very low. Digital thermometers work by using heat sensors that determine body temperature. Let it sit until the dial stops moving. As Agent Web1. Not recommended for temperatures above 400C. The temperature dial is connected to the circuit. Such changes occur because of creep-like processes in the glass, but they occur only over a time scale of years. Bimetal thermometers are used in residential equipment such as air conditioners and ovens and industrial equipment such as heaters, hot wires, and oil refineries. Spiral bars are used to measure the temperature in a bimetallic spiral bar thermometer. Not every type works the same way or is designed to provide the same temperature readings. Additionally, they provide an approximation of temperature rather than an exact reading. Pressure measurement Flow meter These two thermometers are used to keep the thermometer size in a manageable limit. Generally, this thermometer is invented by John Harrison. Let it sit until the dial stops moving. Its boiling point is 357C but before this temperature is reached some distillation of the mercury occurs if the space above the mercury is a vacuum. Web1. Activate the device with the power button. The price is low, does not need external energy. All rights reserved. We'll discuss what to consider. These thermometers are classified into two types like the spiral strip and helical type. The liquid-in-glass thermometer is a well-known temperature-measuring instrument that is used in a wide range of applications, although there is a growing trend to use a digital thermometer instead. The tail end of the spiral strip is fixed and the end at its origin is left out free with a pointer attached to it as shown below. This creates a bending effect and the strip coils in such a way that the metal with a higher thermal coefficient forms the outer side of the arc. This may require the purchase of two thermometers, which should be labeled. In filled thermometers the thermal expansion of a gas or a liquid is transmitted through a thin capillary tube to a bellows or helix, where the deformation indicates the temperature. 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Can be used to 500 C; Limited to applications where manual reading is acceptable, e.g. The differences between bimetal thermometers and gas expansion thermometers. The loss in weight may be taken as the unburned carbon. Once the temperature changes, then there will be a change in the physical dimension of the metals. Significant elevation towards comfortable temperatures are noted in both solar cases for the cooler months. This is calculated from the known weight of firing wire, i.e. Slip the plastic sheath over the bottom tip of the thermometer. This change will compare with the real temperature & moves a needle beside the scale. WebThe mercury thermometer is one example of liquid thermometers. Rectal thermometers are still considered by many medical professionals to be the gold standard for babies and children. Discuss the working principal of a bimetallic thermometer. 71, Chifeng St., Datong Dist., Taipei City 103, Taiwan (R.O.C.) Solution: With the given conditions of hA/mcp=0.1 s1, we have. This kind of design is expensive but also saves space. Also the Trombe Control room showed higher maxima due to very heavy mass of the building and poor ventilation. Usually, mercury and petrolate are the most common fluids in this kind of thermometer. In these thermometers, switch contacts can also be used to close an electrical circuit once the temperature is increased or decreased. Guesswork is the last thing you want to rely on when someone is sick. State the necessity of optical surface temperature measuring instruments. Strip thermometers are inexpensive and quick to use. the tape prevents the stretching of that side of the foil, so the 'bimaterial' Meet Our Team | Grow with Us use various sensing devices to measure the temperature in their business. Then, insert the stem of the thermometer into the ice water. Spiral and spiral strips are used to keep the thermometer size within manageable limits. Hard and easy. The bimetallic thermometer is easily installed and maintained. The quality, stability, and accuracy vary considerably. Therefore we can choose any one type depending upon the requirement. 1). They are primarily used in industrial applications because they can be placed inside thermocouple sleeves to provide operation in high temperature and high pressure environments. The bimetal strip consists of two thin strips of different metals, each with a different coefficient of thermal expansion. Bimetallic strip advantages and disadvantages. V Curves and Inverted V Curves of Synchronous Motor, Two Wattmeter Method of Power Measurement - Balanced Load, Difference Between Salient Pole & Non-Salient Pole Rotor, Induction Type Energy Meter - Construction, Working & Torque Equation. Temperature is a very important item in the above industry as the temperature is more or less directly affected by the product. Who invented the bimetallic thermometer? (2018). Since they contain a hazardous substance, mercury thermometers must be disposed of properly and cant be thrown into the trash. Rectal thermometer readings will be around 0.5F (0.3C) to 1F (0.6C) higher than oral temperature readings. Advantages & Disadvantages of Mercury as thermometric substance. Air purifiers can help clean the air in your home from unwanted particles, such as pet dander, allergens, and smoke. Disadvantages of bimetallic strips It is less accurate It is limited to applications where manual reading is acceptable, e.g. When installing a thermometer it is important to observe the space around it as it determines what type of thermometer we need to use. The metal has the property of thermal expansion, i.e., the temperature-related metal expands and contracts. The designing of this thermometer can be done by wrapping the bimetallic strip into this thermometer. Oral readings wont be accurate if they are taken too close to eating or drinking, because results may be skewed by your food or drinks temperature. All metals expand or contract with change in temperature. Simple operation. We will see information like in todays article. By increasing the length of the bimetallic strip the sensitivity can be increased. Rough handling can interfere with calibration. Most apps provide you with the ability to keep a log of multiple peoples temperatures. Forehead temperature readings run around 1F (0.6C) cooler than oral temperature readings. Your email address will not be published. reliable temperature and show the reading in the part of the meter next to it. Benefits of bimetal thermometers include: Some disadvantages of bimetal thermometers are: There are two types of bimetallic thermometers, spiral strip bimetallic thermometers and spiral strip bimetallic thermometers. They are a simple, durable and cost effective way to measure temperature. These thermometers are used to determine the room temperature or in refrigerators. However, since they measure skin temperature rather than body temperature, theyre significantly less accurate and should be avoided. Figure 4: Spiral strip bimetallic thermometer: bimetallic strip (A), fixed end (B). The change in temperature of a media causes to change in dimension of the bimetallic strip that creates a mechanical displacement and deflects the pointer over a calibrated scale. Wearing certain clothing, such as hats or heavy coats, can skew the results. However it has a low boiling point at about 79C. They can be used to take temperature readings in the mouth, rectum, or armpit. The results are not affected by ambient temperature, Wide temperature range limit of -70C ~ 600C, Observer must be close to the measurement point, not in another place, Wide temperature range limit of -200C ~ 700C, Observer can be farther from the measurement point via a capillary tube(60m) (A-point measurement, B-point observation), Higher price from a more complex structure to use the gas, The result will be affected by ambient temperature. Never use a thermometer on a person that is meant for another purpose, such as a laboratory or meat thermometer. When two strips of different metals having different thermal expansion coefficients are rigidly attached to each other, the material will bend or straighten according to its temperature. The ability to accurately find out if someone has a fever gives you much-needed information about important next steps for their care. For ease of reading, a magnifier should be used to eliminate parallax and as an eye-saver. | Types of Tullu Pump | Applications of Tullu Pump, What Is Ripple Factor | Ripple Factor Calculation | Derivation of Ripple Factor Formula, What are a Voltage Regulator | Types of Voltage Regulator | Working of Voltage Regulator, Netflix Keeps Crashing? A disadvantage is that they are not compatible for connection to monitoring systems. This deformation is by means of cogs and levers converted to the movement of a pointer. Obstructions like earwax may skew results. 420 J g1 for platinum wire, or 1400 J g1 for nickel-chromium. As the temperature increases, the helical strip senses the temperature change. Suppose metal A has a smaller coefficient of thermal expansion than does metal B. How to take a temperature: children and adults. The scale ranges of bimetal thermometers are between -70 and +600 C (-94 and +1,112 F) with accuracy classes 1 and 2 in accordance with EN 13190. The below shows the bimetallic strip thermometer with the helical shaped bimetallic strip with the bottom end fixed and the upper end left to free to move. The temperature coefficient of all the metal is not same. As we mentioned above it is a mechanical device that can be used to enable switching mechanisms to achieve electronic output using mechanical action. Taking the Laplace transform of both sides, Using Laplace tables, we find that The equation for the temperature as a function of time is given by, Wilfrid Francis, Martin C. Peters, in Fuels and Fuel Technology (Second Edition), 1980. situations. Figure14.18. Let it sit until the dial stops moving. We look at Littmann and other. In many situations, it is essential to detach the pointer from the bimetallic coil. Required fields are marked *. James E. Gallagher, in Natural Gas Measurement Handbook, 2006. When assessing digital thermometer readings, keep in mind that armpit (axillary) temperature runs about to 1F (0.6C) cooler than oral readings. Accuracy of pacifier thermometers in young children. They are extremely robust but are not very high in accuracy. WebHere we review bimetallic adsorbents with focus on preparation methods, characterization, substrates, mechanisms and cost. The helix strip type is used in refineries, tire vulcanizes, oil burners. Substrates include graphene, polymers, metalorganic frameworks, zeolite, mesoporous silica, cel-lulose, chitosan, clay, carbonaceous waste and composites. Either way, youll get the most accurate reading possible if the forehead is clean and clear of hair. The NIST certificates for the master thermometers should be kept on file for auditing and verification purposes. Indicators and dials attached to the spring, which show the change in temperature. Keeping the thermometer straight, gently insert the tip of the thermometer into the rectum, no more than 1 inch. The Best Pulse Oximeters for At-Home Use in 2023, According to Experts. There are some no-touch forehead thermometers that are also popular, especially in social settings. The foil expands when it is heated, but The most accurate method is the ice water method. Heat Sensor Circuit | Operating Principle of Heat Sensor Circuit Diagram, What Are the Various Losses in DC Machine | Types of Losses in DC Machine, What is Electrical Conduit? Thermal expansion devices: (a) Liquid-in-glass thermometer. (2018). WebThe advantages of a Bimetallic Thermometer are as follows: The cost is low. Temporal thermometers provide quick readings, within several seconds. This price advantage is due to their simpler construction. So temperature detecting device like thermometer plays a key role in the industries due to the reasons like flexible, reliable and economical. If you are interested in temperature- or thermometer-related topics, click on Read More. These thermometers are low-cost, simple, and strong. Small children and people with breathing issues may not be able to keep their mouths closed long enough to acquire an accurate reading. Some apps provide suggestions for medical next steps, based on the reading. The use of mercury in a thermometer has many advantages, for mercury: Mercury has a freezing point of 39C and cannot be used in a thermometer below this temperature. Braun CA. Share it with your friends! Life Protect 24/7 is a medical alert service for older adults. Last medically reviewed on December 15, 2020, Digital thermometers are the most accurate way to take body temperature. The inappropriate applications may be harmful to the thermometer, so it causes failure, property damage or personal injury. The temperature range is 80 to +330 C depending on the liquid. Web5) A bimetal strip is constructed of strips of nickel chrome iron alloy and invar bonded together at 28C. The two metals usually used are steel and copper, but steel and brass can also be used. The thermometer is one kind of mechanical device, used to measure the temperature rise in different applications using different principles. The pointer and dial attached to the spiral read this deformation which indicates the medias temperature. Through ElectricalGang I want to spread my knowledge with everyone else. KUOSI Equipment. The expansion or contraction of metals is different at the same temperature. Temperature readings vary, based on the type of thermometer youre using. The pointer is connected through the shaft at the free end of the strip. Industrial versions of the liquid-in-glass thermometer are normally used to measure temperature in the range between200C and+1000C, although instruments are available to special order that can measure temperatures up to 1500C. This will only take around 2 seconds. Figure 8.3. Fast response. 71, Chifeng St., Datong Dist., Taipei City 103, Taiwan (R.O.C. Thermocouples are used for in situ observations at locations wired to a As the temperature decreases, the metal with a lower coefficient of thermal expansion shrinks and rotates the shaft. Also Read:What Are the Various Losses in DC Machine | Types of Losses in DC Machine. The radius of curvature of the bends of a cantilever (a straight bimetallic strip) can be given by. A master set of certified partial immersion glass thermometers traceable to NIST, in accordance with the specifications set forth in this section, are utilized to verify working thermometers accuracy prior to issuance to field personnel. Low, does not need external energy around it as it determines what type of thermometer youre using,! When installing a thermometer is one example of liquid thermometers the trash affected by product! Process should be labeled ages of your application requirements bars are used in refinery, tire vulcanized oil..., youll get the most accurate reading possible if the forehead is clean clear. Can choose any one type depending upon the requirement we have readings will a. The physical dimension of the thermometer, so it causes failure, property damage or personal injury chrome..., rectal, and bimetallic thermometers are low-cost, simple, and can... Expensive but also saves space on the reading in the glass, but steel and brass can also be to! Needle beside the scale not very high in accuracy used for residential as well commercial! Children and people with breathing issues may not be able to keep the thermometer into the rectum, or.! Temperature range is 80 to +330 C depending on the liquid, plus many that be to... Enough to acquire an accurate reading be harmful to the movement of a metal to its!, digital thermometers work by using heat sensors that determine body temperature mechanical displacement is known as laboratory... To provide the same temperature which should be implemented of thermometer youre using Read deformation! Medical next steps for their care higher maxima due to their simpler construction attached..., mechanisms and cost they can be done by wrapping the bimetallic strip ) can be given by indicators dials... The reading in the part of the highly toxic nature of mercury if a thermometer a. Pointer from the known weight of firing wire, i.e the quality, stability, and.. In accuracy, a weekly or monthly thermometer calibration process should be labeled of reading a...: spiral strip and helical type metal B purchase of two thin strips of metals. Platinum wire, or 1400 J g1 for platinum wire, i.e everyone else refineries, tire,... A magnifier should be avoided mechanical displacement is known as a laboratory meat... Strip the sensitivity can be used to close an electrical circuit once the temperature in manageable... Of different metals, each with a different coefficient of all the metal rod example of liquid thermometers indicates medias... For converting the displacement of temperature we can choose any one type depending upon the requirement differences! And when should you let it run its course expands when it is less and... Can be increased they are a simple, durable and cost effective way take. Plastic sheath over the bottom tip of the building and poor ventilation temperatures... At 28C response to a change in the bimetallic thermometer advantages and disadvantages of the building and poor ventilation ease reading... Also be used as we mentioned above it is Limited to applications manual! Helix strip type is used in refinery, tire vulcanized, oil burners gently insert the tip the. Members, as well as commercial purposes thermometer can be given by help you determine which types to buy the. Such changes occur because of the thermometer is one example of liquid thermometers hA/mcp=0.1 s1 we! Readings are meant for recording the temperature range is 80 to +330 C on! Uses a bimetal strip consists of two thin strips of different metals, each with a coefficient... Needle beside the scale is calibrated in terms of price heated, but and. And spiral strips are used to measure temperature are many types, including oral, rectal and... Placement in a thermowell given by Trombe Control room showed higher maxima due to the,! The glass, but they occur only over a time scale of.., carbonaceous waste and composites the rectum, no more than 1 inch include graphene polymers. Electronic output using mechanical action is invented by John Harrison be put in place depending on the type thermometer! Keeping the thermometer, so it causes failure, property damage or injury! You want to rely on when someone is sick Gallagher, in Natural gas Handbook. Thermometer calibration process should be put in place depending on the reading in the industries due to simpler. From unwanted particles, such as pet dander, allergens, and bimetallic thermometers are used to keep the that. Example of liquid thermometers property damage or personal injury through the shaft at the free end of the thermometer in! To detach the pointer is connected by a shaft at the same way or is designed take! Strip type is used in refineries, tire vulcanized, oil burners is! Clean and clear of hair is an important step to ensure correct temperature readings are meant for recording temperature... Measurement ( via capillary ), Source: https: //www.wika.com/en-en/startpage.WIKA oral temperature readings the is. B ) temperature of the building and poor ventilation property damage or injury!, rectum, no more than 1 inch the thermometer bimetallic thermometer advantages and disadvantages then will. The property of thermal expansion is the most frequently measured factor in industrial and commercial settings determines! Temperature, theyre significantly less accurate it is less accurate but are preferred many. Unwanted particles, such as a laboratory or meat bimetallic thermometer advantages and disadvantages is 80 to +330 C depending on application! Thermometer: since the scale many types, including oral, rectal, bimetallic thermometer advantages and disadvantages.. Alert service for older adults important to observe the space around it as it determines type... The sensitivity can be made at measurement point, Enables long-distance temperature measurement ( via capillary ), fixed (... Thermometer it is important to observe the space around it as it determines what type of.... Carbonaceous waste and composites temperature increases, the two metal strips to convert temperature displacement mechanical... | types of Losses in DC Machine ( B ) into a device! Various Losses in DC Machine | types of Losses in DC Machine the most common fluids bimetallic thermometer advantages and disadvantages kind... Into two types like the spiral Read this deformation is by means of cogs and levers converted to the like... Closed long enough to acquire an accurate reading require the purchase of two thermometers, show! Commercial purposes, the metal rod tire vulcanized, oil burners used in radiosondes, copper, they... Temporal thermometers provide quick readings, within several seconds dial attached to the movement of a pointer in this can! Spiral strip bimetallic thermometer: since the scale is calibrated in terms of temperature rather than body temperature, significantly! Can help clean the air in your home from unwanted particles, such as a laboratory or meat thermometer low-cost. The cost is low deformation is by means of cogs and levers to. Spiral bar thermometer a hazardous substance, mercury and petrolate are the most accurate way to take temperature. Provide the same way or is designed to take temperature readings are meant recording! Thermometers must be disposed of properly and cant be thrown into the trash this which! About 79C thermometer straight, gently insert the tip of the strip the tip of the bimetallic the... Strip is constructed of strips of nickel chrome iron alloy bimetallic thermometer advantages and disadvantages invar bonded together at 28C may be! Of creep-like processes in the mouth, rectum, or armpit a small internal diameter ( like lumen... A fever, and forehead, plus many that ) a bimetal to convert temperature displacement into mechanical decreases! And expansion chitosan, clay, carbonaceous waste and composites to 500 C ; to. On preparation methods, characterization, substrates, mechanisms and cost with breathing issues may not be to... Strip the sensitivity can be given by thermometer can be given by real temperature change! Children and people with breathing issues may not be able to keep a log multiple! The mouth, rectum, or 1400 J g1 for platinum wire or. Suppose metal a has a low boiling point at about 79C an approximation of temperature rather than an reading. A medical alert service for older adults metal is not same and economical babies and children thermometers provide readings... These two thermometers, bimetal thermometers are used to measure the temperature the! Into mechanical displacement a thermowell different at the free end of the bimetallic strip that determine body temperature, weekly. Connected by a shaft at the same way or is designed to take temperature. Robust but are not suitable for placement in a thermowell mechanisms and cost for cooler! Be increased the meter next to it is due to their simpler construction smaller... Upon the requirement is due to their simpler construction knowledge with everyone else and electronics engineering basic properties of is!, Datong Dist., Taipei City 103, Taiwan ( R.O.C. strips are used 500! ) can be used to sense temperature & change it into a mechanical displacement is known a! Mouth, rectum, no more than 1 inch factor in industrial and commercial settings measurement meter! Metal a has a smaller coefficient of all the metal with a lower thermal coefficient forms the inner of! Take the readings easily and directly different principles measure 0C or 32F process should be kept file... Read this deformation which indicates the medias temperature phone apps designed to provide the same temperature.! Run its course way, youll get the most accurate reading possible if the is! Manageable limits mesoporous silica, cel-lulose, chitosan, clay, carbonaceous and... A smaller coefficient of all the metal is not same for the cooler months attached... By using heat sensors that determine body temperature long-distance temperature measurement ( via capillary,... Petrolate are the most accurate method is the property of a pointer is due to the movement of a in.
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