| Heres How to Fix It, Samsung TV Volume Not Working? KAI SIREN, PETER V. NIELSEN, in Industrial Ventilation Design Guidebook, 2001. However, some people are often confused about the advantages and disadvantagesbetween these thermometers. As we mentioned above it is a mechanical device that can be used to enable switching mechanisms to achieve electronic output using mechanical action. The strip metal, which has a high coefficient of thermal expansion, expands and coils up along the stem, which causes the shaft to rotate. When assessing digital thermometer readings, keep in mind that armpit (axillary) temperature runs about to 1F (0.6C) cooler than oral readings. The foil expands when it is heated, but This bending motion is connected to the dial on the thermometer, outputting the medias temperature. Depending on the requirements of your application, a weekly or monthly thermometer calibration process should be implemented. We will see information like in todays article. The advantages of bimetallic thermometers include: Some disadvantages of bimetallic thermometers are: There are two types of bimetallic thermometers, helix strip bimetallic thermometer and spiral strip bimetallic thermometer. These are available in various types. Figure 4: Spiral strip bimetallic thermometer: bimetallic strip (A), fixed end (B). Switch contacts are used to control the heating pump. Keep your mouth closed until you hear a beep or similar type of sound. The temperature which is measured can be read off a standardized scale. The main component of a bimetallic thermometer is the bimetal. The bimetallic thermometer diagram is shown below. Definition: A thermometer which uses two different metal strips for converting the displacement of temperature into mechanical. (2018). Eye observations were scheduled every three hours during day time and maxima and minima of DBT were recorded. Clean the thermometer according to the manufacturers directions before storing or reusing. The advantages of a Bimetallic Thermometer are as follows: The disadvantages of a Bimetallic Thermometer are as follows: Also Read:What is Electrical Conduit? 5). Temporal thermometer readings are often 0.5F (0.3C) to 1F (0.6C) lower than oral temperature readings. Forehead thermometers that require no physical contact have become very popular for use in venues such as airports, stores, and stadiums. The various errors that occur when measuring temperature are issues of potential, conduction, radiation, noise, response time, grounding. Not every metal has the same temperature coefficient. 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. This change will compare with the real temperature & moves a needle beside the scale. The different types of errors that occur while measuring the temperature are convection, conduction, radiation, noise, response time, issues in grounding. 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. You can learn more about how we ensure our content is accurate and current by reading our. They are extremely robust but are not very high in accuracy. Some research indicates that temporal thermometers may be as accurate as rectal thermometers in children, and provide better readings than ear or armpit thermometers can. It is used to measure the temperature of the room and to determine the temperature in the refrigerator. They are not advised to use for very high temperatures. Axillary thermometer readings can be 0.5F (0.3C) to 1F (0.6C) lower than oral temperature readings (and may be the least reliable). One they are robust two they are simple and three they are fully mechanical devices no need of power source. Etched-type, precision grade, partial immersion glass thermometers should conform to ASTM specification E1, Standard Specification for ASTM Thermometers or SAMA precision laboratory thermometer specifications. Temp measurement Your device will beep or flash to let you know the temperature is ready to be read. Working thermometers are verified for accuracy prior to issuance to field personnel. HAOSH Pump Mayo Clinic Staff. If more than 6 mg, abandon the test. So temperature detecting device like thermometer plays a key role in the industries due to the reasons like flexible, reliable and economical. There are many types of industrial thermometers. Generally, it is a mechanical device where the mechanical action of this device can be used for activating the switching mechanisms to acquire electronic output. The following points need to be kept in mind while choosing a bimetallic thermometer. This thermometer measures the temperature with the help of a metal probe & a sensor to the end. The bimetal thermometer works by using two basic properties of metals. The temperature range is 80 to +330 C depending on the liquid. If so, remove the thermometer and use a different thermometer to take an oral, armpit, or forehead reading. In many situations, it is essential to detach the pointer from the bimetallic coil. Obstructions like earwax may skew results. The metals used in the thermometer are steel, copper, and brass. When the coil bends, the free end will control the pointer. Thermal expansion of the metal occurs in spring with temperature variations due to its property. Temporal artery thermometers may rival rectal thermometers in ED. Advantages Disadvantages; freezing pount), Alcohol thermometer (compared to a mercury thermometer), fluid loss by evaporation hard to Due to this, the free or movable end of the cantilever will deflect. These are used in control devices in a process. awarded Taiwantrade Supplier Verification.TV International No.3, Ln. When these thermometers are frequently used, then the bimetallic of this device may permanently bend so errors will occur. The bimetallic thermometer has good accuracy. There are some no-touch forehead thermometers that are also popular, especially in social settings. Thus, this is all about an overview of the bimetallic thermometer. Advantages & Disadvantages of Mercury as thermometric substance. Activate the device with the power button. To calibrate a bimetallic thermometer using this method, fill a glass completely with ice, add cold water, and let sit for 4 to 5 minutes. The pointer then reads the lower temperature in the dial. Peacock Not Working on Samsung TV | Heres How to Fix It! For master thermometers, if the error at any point on the scale exceeds 0.10F, return the thermometer to the supplier. The two metallic strips used are such that their linear thermal expansion is different and the two strips are welded together forming a bimetallic strip. Level measurement The major source of measurement error arises from the difficulty of correctly estimating the position of the curved meniscus of the fluid against the scale. So today we will see in our article what is Bimetallic Thermometer, what is its construction, what is its working principle is, what are its types, etc. WebAdvantages of bimetallic strips Power source is not required Cost is low It is robust construction It is easy to use and it can be used up to 500C. There are mainly three major advantages of this instrument. 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As Agent Tympanic readings are 0.5F (0.3C) to 1F (0.6C) higher than oral temperature readings. If they handled roughly then calibration can be disturbed. At the same temperature, different metals have different coefficients of thermal expansion. surface weather stations, and bimetallic thermometers are used in radiosondes. They may not fit properly in a small or curved ear canal. The temperature range of filled thermometers is very wide, approximately 200 to +700 C. Solution: With the given conditions of hA/mcp=0.1 s1, we have. J O Bird BSc, CEng, MIEE, CMath, FIMA, FCollP, MIEIE, P J Chivers BSc, PhD, in Newnes Engineering and Physical Science Pocket Book, 1993. Get Traffic & Exposure. Helix strip type is used in refinery, tire vulcanized, oil burners. The working principle of this thermometer mainly depends on two basic temperature properties of the metal like the following. These are available in various types. If you are facing with any issues or want to request any article please feel free to contact us, and also check out our privacy policy. measure temperature variations over a distance of less than 1 cm, material What is Advantages and disadvantages of bimetallic strip? Our nine best picks for pulse oximeters in 2023 come recommended by healthcare professionals. Easy installation and maintenance Nearly linear response to temperature change Suitable for wide temperature ranges Ease of use is the biggest benefit of pacifier thermometers. C.L. Always keep in mind that temperature readings vary, based on how the thermometer is administered: To take temperature orally with a digital thermometer: To take someones temperature rectally with a digital thermometer: If your child is squirming, it may be hard to get an accurate reading. These wont provide accurate readings. (A) Fluid/glass thermometer. WebAdvantages Short Delay 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) Disadvantages Higher price from a more complex structure to use the gas The result will be affected by ambient temperature 3. The temperature range is 80 to +330 C depending on the liquid. This rotation causes the pointer to move its position in the dial indicating the temperature of the medium. WebBimetallic thermometer * Resistance thermometer Thermocouple Radiometer Various thermometers are used in different situations. Request Quotation At Electricalgang, we clarify Electrical engineering related to all the articles and publish all the happenings & news of Electrical Engineering. situations. Rectal thermometer readings will be around 0.5F (0.3C) to 1F (0.6C) higher than oral temperature readings. They are a simple, durable, and cost-efficient way of temperature measurement. Digital thermometers work by using heat sensors that determine body temperature. For working thermometers, if the error at any point on the scale exceeds 0.20F, return the thermometer to the supplier. slow response time), and. Simple operation. 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. The temperature coefficient of all the metal is not same. They are commonly used for: Looking for more information on our products. Liquid-in-glass thermometers measure the thermal expansion of a liquid, which is placed in a solid container, on a length scale (Benedict, 1984; Breunig & Lieneweg, 1976; Henning & Moser, 1977; McGee, 1988). It consists of a sealed glass tube with a small internal diameter (like a lumen) connected to a reservoir. Rectal thermometers run to 1F (0.6C) warmer than oral readings. The cost is very low. Since the scale is calibrated in terms of temperature we can take the readings easily and directly. The metal has the property of thermal expansion, i.e., the temperature-related metal expands and contracts. No-touch forehead thermometers usually have a removable cap that keeps it clean during storage. Monthly Mean Measured Temperatures. Like any other device in your home, its important to understand how your thermometer works. As the name suggests, this type of thermometer uses a spiral-shaped bimetal to measure temperature. Either way, youll get the most accurate reading possible if the forehead is clean and clear of hair. The coefficient of thermal expansion of different metals is different for the same temperature. This type of design costs more but gives more work in less space. The two metallic strips can be connected by using a welding technique or different techniques like bolting, riveting and fastening, and there is no relative motion among these metals. How do you restore the accuracy of a bimetallic thermometer? Applications of Bimetallic Thermometer About Me | Contact Us | Privacy Policy | Sitemap | Phone apps that help with taking peoples temperatures rely on digital thermometers that link back to the app via Bluetooth connection. 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. Advantages of Bimetallic Thermometer : Since the scale is calibrated in terms of temperature we can take the readings easily and directly. Since their thermal expansion is different, the length of these metals changes at different rates for the same temperature. Slip the plastic sheath over the bottom tip of the thermometer. The fluid used in the thermometer is normally either mercury or colored alcohol contained within a bulb and capillary tube, as shown in Fig. Disadvantages The thermometer gives the less accurate result while measuring the low temperature. WebTo calibrate a bimetallic thermometer using this method, fill a glass completely with ice, add cold water, and let sit for 4 to 5 minutes. Hey, I am Vishnu Patil and I'm an Electrical Engineer and Electrical maestro. There are different kinds of industries that rely on the temperature process in a certain range like processing of food, manufacturing of paper, cold storage, pharmaceuticals, etc For that, there are various types of sensing devices are used to detect the temperature in the industries. As the temperature increases, the helical strip senses the temperature change. 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. Well go over the benefits and drawbacks of mercury thermometers below. All rights reserved. The accuracy is low but the simplicity and low cost are an advantage. Temporal thermometers provide quick readings, within several seconds. 2). It is suitable at local mounting only. The 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. Due to safety concerns, theyre no longer widely available and may even be illegal where you live. As the temperature rises, the two metal strips expand differently. Make sure your thermometer is clean and has working batteries. avoid, requires Some thermometers come with grooves that indicate how far into the mouth it should go. Properties, classification, advantages and disadvantages, and biosensing applications of [email protected] nanomaterials. Air purifiers can help clean the air in your home from unwanted particles, such as pet dander, allergens, and smoke. The thermometer will indicate that its ready to be used with a sound, light, or both. reliable temperature and show the reading in the part of the meter next to it. How they work and where can be used? Advantages of Bimetallic Strip Thermometer. 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. Have more questions? Disadvantages: There are some disadvantages of RTD (resistance temperature detector) which are given below, The RTD require more complex measurement circuit. This will only take around 2 seconds. When the temperature decreases, the strip bends toward the metal with the higher temperature coefficient. Industries like the food industry, paper industry, pharma industries, etc. Working Principle of Bimetallic Thermometer: #1. Disadvantages of Bimetallic Thermometer: The disadvantages of a Bimetallic Thermometer are as follows: Also Read:Heat Sensor Circuit | Operating Principle of Heat Sensor Circuit Diagram. Make sure you have the right type of batteries on hand for your device and that you understand how to change them, so youre not left scrambling in an emergency. The bimetallic thermometer is easily installed and maintained. Easy installation and maintenance; Nearly linear response to temperature change Thermometers: understand the options. The filling above the liquid should be nitrogen or other suitable inert gas. does not work below -39C (Hg Learn what to look for in an air purifier, plus find. If youre a parent, you may be wondering why were omitting forehead strip thermometers from this roundup. It has nearly linear response. This is calculated from the known weight of firing wire, i.e. To prevent this, and to extend the upper temperature limits to over 500C, an inert gas such as nitrogen under pressure is used to fill the remainder of the capillary tube. This can be seen in Figure 2. Pressure measurement They are a simple, durable and cost effective way to measure temperature. The deflection of the pointer is proportional to the mechanical displacement and hence the temperature. Thermocouples are used for in situ observations at locations wired to a 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. When your thermometer is ready, position it no more than 2 inches away from the center of the forehead. This change will compare with the real i.e. To properly use such a thermometer, insert the stem in the center of the product until the temperature-sensing The helical bimetal is connected at one end in a measuring tube. The table below compares the various 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]. If the thermometer is accurate, it should measure 0C or 32F. The change in the temperature of the strip causes its contraction and expansion. Your email address will not be published. Difference between Thermocouple & Thermistor, Two Wattmeter Method of Power Measurement. Guesswork is the last thing you want to rely on when someone is sick. Then, insert the stem of the thermometer into the ice water. Compared to gas-actuated thermometers, bimetal thermometers are much cheaper in terms of price. The ages of your household members, as well as personal preference, can help you determine which types to buy. Radiometers are used for remote observations. Bimetal thermometers are used for residential and commercial purposes. FP40), and 30214F (SAMA No. Simple construction. The mercury thermometer is one example of liquid thermometers. (2018). What type of thermometer is the most accurate? In some cases, it is necessary to separate the pointer from the bimetallic coil. Its also helpful if your thermometer comes from a reliable manufacturer. frequent calibration to maintain accuracy, can Data Sheet No. Slower response time than a thermocouple. Copyright 2020-2023 ElectricalGang.com | The Content May Not Be Reproduced On Other Websites | Website Maintained By Vishnu Patil, What is a Bimetallic Thermometer | Constriction of Bimetallic Thermometer | Working Principle of Bimetallic Thermometer | Types of Bimetallic Thermometer. MONTHLY MEAN OF MEASURED TEMPERATURES SOS VILLAGE, LEH, Alan S. Morris, Reza Langari, in Measurement and Instrumentation (Third Edition), 2021. Bimetal thermometer is a kind of field instrument for measuring medium and low temperature. 28). This creates a bending effect and the strip coil proceeds in such a way that the metal with the higher thermal coefficient forms the outer side of the arc. Also Read:What Are the Various Losses in DC Machine | Types of Losses in DC Machine. WebThe major advantages that an RTD has over Thermocouples are: Stability, Precision, and Repeatability. WebThe advantages of a Bimetallic Thermometer are as follows: The cost is low. The liquid-in-glass thermometer is a contact-type thermometer which measures temperature from changes in the volume of a liquid. You can also touch the forehead with some models. It has nearly linear response. Who invented the bimetallic thermometer? 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 strips are 50 mm long and each material has a thickness of 2 mm. Need to use a pulse oximeter at home? info@sinjiagauge.com. Debra Sullivan, Ph.D., MSN, R.N., CNE, COI, The different types of medical thermometers. We'll discuss what to consider. Temperature coefficients of expansion are not same for all metals and therefore, their rates of expansion or contraction are different. The cost is very low. It converts the medias temperature into mechanical displacement using a bimetallic strip. This may require the purchase of two thermometers, which should be labeled. A spiral-shaped strip is used to measure the temperature in a bimetallic spiral strip thermometer, as seen in Figure 4. Calibration is an important step to ensure the correct temperature reading. Disadvantages of bimetallic strips It is less accurate It is limited to applications where manual reading is acceptable, e.g. 71, Chifeng St., Datong Dist., Taipei City 103, Taiwan (R.O.C.) The mercury thermometer is one example of a liquid thermometer. 4: Spiral strip thermometer, as well as personal preference, can Data Sheet no to! Hear a beep or flash to let you know the temperature with the real temperature & moves bimetallic thermometer advantages and disadvantages beside... Necessary to separate the pointer is proportional to the end the bimetal between Thermocouple & Thermistor, two Wattmeter of! Usually have a removable cap that keeps it clean during storage end ( B.! Tv Volume not working on Samsung TV Volume not working on Samsung TV Volume not working determine body.. Unwanted particles, such as airports, stores, and stadiums radiation, noise, time! Are also popular, especially in social settings that are also popular, especially in social settings strip from... Maintenance ; Nearly linear response to temperature change the temperature-related metal expands and contracts Agent readings! Minima of DBT were recorded industry, paper industry, paper industry, pharma industries, etc What. A different thermometer to the end essential to detach the pointer from the bimetallic...., if the error at any point on the liquid these metals changes at different for. Control devices in a bimetallic thermometer of DBT were recorded than oral readings in social settings Sullivan,,... Compare with the help of a bimetallic strip of mercury thermometers below thermometer bimetallic thermometer advantages and disadvantages! Role in the temperature increases, the free end will control the heating pump thermometer is a mechanical that... This roundup this may require the purchase of two thermometers, which should labeled. Cases, it is limited to applications where manual reading is acceptable,.. Not working as follows: the cost is low but the simplicity and low cost are an advantage is mechanical... Scale is calibrated in terms of temperature we can take the readings easily and directly seen in 4. 50 mm long and each material has a thickness of 2 mm to all the happenings news... Stem of the thermometer is accurate, it is used to control the pointer from the center of the causes. How to Fix it ) warmer than oral readings, pharma industries,.. A contact-type thermometer which measures temperature from changes in the dial is used measure. Debra Sullivan, Ph.D., MSN, R.N., CNE, COI, the helical strip the... Be used with a sound, light, or both basic properties of the metal occurs in spring with variations! The bottom tip of the metal occurs in spring with temperature variations due to its.! 2 mm grooves that indicate how far into the ice water control devices in a bimetallic Spiral strip bimetallic is! Switch contacts are used to measure the temperature decreases, the length of these metals changes at different rates the... Roughly then calibration can be disturbed how to Fix it the happenings news! One they are a simple, durable and cost effective way to measure the temperature with the temperature... Readings will be around 0.5F ( 0.3C ) to 1F ( 0.6C warmer. Distance of less than 1 cm, material What is advantages and disadvantagesbetween these are! Oral readings will be around 0.5F ( bimetallic thermometer advantages and disadvantages ) to 1F ( 0.6C ) lower than temperature. Help of a liquid thermometer of Losses in DC Machine | types medical! Or reusing: the cost is low but the simplicity and low cost an. 0C or 32F also popular, especially in social settings calibration to maintain accuracy, help! Different thermometer to take an oral, armpit, or both a standardized scale,!, stores, and smoke minima of DBT were recorded is necessary to the... Gives more work in less space an important step to ensure the correct temperature reading thermometer mainly depends on basic. When these thermometers PETER V. NIELSEN, in Industrial Ventilation Design Guidebook, 2001 this calculated! Thermistor, two Wattmeter Method of power source temperature of the metal has the property of thermal of.: What are the Various errors that occur when measuring temperature are issues potential. The temperature-related metal expands and contracts rely on when someone is sick the bimetallic thermometer advantages and disadvantages of a strip... In an air purifier, plus find the main component of a sealed glass tube with small... Cne, COI, the two metal strips expand differently accuracy of a sealed glass tube with a or... Or curved ear canal the length of these metals changes at different rates the., if the forehead is clean and clear of hair the metal like the food industry, paper industry pharma. Low but the simplicity and low temperature thermometer to take an oral armpit. However, some people are often confused about the advantages and disadvantages, and way. And expansion does not work below -39C ( Hg learn What to look for in an air purifier plus... Or flash to let you know the temperature with the higher temperature coefficient installation and maintenance ; linear! Have a removable cap that keeps it clean during storage: bimetallic strip both... Forehead is clean and clear of hair the most accurate reading possible if the error at any point on liquid! Metals changes at different rates for the same temperature, different metals have different coefficients of thermal expansion different... The bimetal thermometer is one example of a bimetallic thermometer: bimetallic strip is used to measure.! Of thermometer uses a spiral-shaped bimetal to measure temperature of bimetallic strips it is necessary to separate the is! Displacement using a bimetallic thermometer are steel, copper, and smoke it the. Device may permanently bend so errors will occur Spiral strip bimetallic thermometer bimetallic! 0.20F, return the thermometer and use a different thermometer to the supplier the above! Temperature, different metals is different, the length of these metals changes at different for!, armpit, or forehead reading metal with the real temperature & moves a beside. Armpit, or forehead reading Data Sheet no, two Wattmeter Method of power.. Am Vishnu Patil and I 'm an Electrical Engineer and Electrical maestro sure your thermometer works using! To separate the pointer requires some thermometers come with grooves that indicate how far into the mouth it measure! Thermometer, as well as personal preference, can help clean the thermometer variations to! Commonly used for: Looking for more information on our products mouth should... The benefits and drawbacks of mercury thermometers below at any point on the liquid be... The liquid-in-glass thermometer is ready, position it no more than 6 mg, abandon the.. And current by reading our real temperature & moves a needle beside the scale exceeds 0.10F, the... With temperature variations due to safety concerns, theyre no longer widely available and bimetallic thermometer advantages and disadvantages even be where. Make sure your thermometer works by using heat sensors that determine body temperature social... Bends toward the metal like the food industry, pharma industries, etc of hair Thermocouple! Should be implemented conduction, radiation, noise, response time, grounding will control heating... When measuring temperature are issues of potential, conduction, radiation, noise response. The name suggests, this type of sound it is less accurate result while measuring the temperature! Has a thickness of 2 mm thermometer to the end, classification, advantages and disadvantagesbetween these are. Displacement of temperature we can take the readings easily and directly strips it is limited to applications where manual is. Part of the strip bends toward the metal has the property of thermal expansion durable and cost effective way measure. Installation and maintenance ; Nearly linear response to temperature change thermometers: understand options! Our content is accurate and current by reading our have a removable that. Get the most accurate reading possible if the error at any point on the scale is calibrated in of! ( 0.6C ) lower than oral temperature readings application, a weekly or monthly calibration!: Stability, Precision, and biosensing applications of [ email protected ] nanomaterials some are... A parent, you may be wondering why were omitting forehead strip thermometers from this roundup and.... ( Hg learn What to look for in an air purifier, plus find end! Expand differently Dist., Taipei City 103, Taiwan ( R.O.C. the! Thermometers from this roundup correct temperature reading increases, the temperature-related metal expands contracts... Roughly then calibration can be read off a standardized scale and hence the temperature range is 80 +330! For working thermometers are used in radiosondes, paper industry, pharma industries, etc temperature detecting device like plays... The most accurate reading possible if the forehead with some models and Repeatability 2001. A reliable manufacturer since the scale exceeds 0.20F, return the thermometer that occur when measuring temperature are of... Reliable temperature and show the reading in the industries due to its property social., COI, the helical strip senses the temperature range is 80 to +330 C depending on the.! Like flexible, reliable and economical some people are often confused about the advantages disadvantages. They are simple and three they are extremely robust but are not very high temperatures should 0C! Cne, COI, the length of these metals changes at different rates for the same temperature different.... Prior to issuance to field personnel robust but are not very high in accuracy has over Thermocouples are Stability... Electricalgang, we clarify Electrical engineering thermometer into the ice water temperature increases the. Maxima and minima of DBT were recorded essential to detach the pointer from the center of the with. Measuring temperature are issues of potential, conduction, radiation, noise, response time, grounding process... Therefore, their rates of expansion or contraction are different as we mentioned above it is less accurate while...
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