{"id":10092,"date":"2021-09-21T15:25:13","date_gmt":"2021-09-21T18:25:13","guid":{"rendered":"https:\/\/blog.wika.com\/pt\/\/?p=10092"},"modified":"2023-11-24T07:53:51","modified_gmt":"2023-11-24T10:53:51","slug":"calibracao-de-temperatura-termopares-vs-termorresistencias","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/pt\/know-how\/calibracao-de-temperatura-termopares-vs-termorresistencias\/","title":{"rendered":"Calibra\u00e7\u00e3o de Temperatura: Termopares vs. Termorresist\u00eancias"},"content":{"rendered":"<p><strong>Na calibra\u00e7\u00e3o de temperatura, altas demandas s\u00e3o exigidas dos term\u00f4metros de refer\u00eancia em termos de exatid\u00e3o e reprodutibilidade e, portanto, estabilidade de longa dura\u00e7\u00e3o. Assim, os sensores de resist\u00eancia, aqui especificamente termorresist\u00eancias de platina e os termopares s\u00e3o utilizados em laborat\u00f3rios. Embora tenham uma fun\u00e7\u00e3o semelhante, em muitos aspectos n\u00e3o poderiam ser mais diferentes.<\/strong><\/p>\n<p>Ao escolher um instrumento para medi\u00e7\u00e3o ou calibra\u00e7\u00e3o de temperatura, os seguintes fatores-chave devem ser considerados:<\/p>\n<ul>\n<li>Exatid\u00e3o<\/li>\n<li>Estabilidade de longa dura\u00e7\u00e3o<\/li>\n<li>Faixa de temperatura<\/li>\n<li>Condi\u00e7\u00f5es ambientais<\/li>\n<\/ul>\n<h2><strong>Funcionalidade e \u00e1reas de aplica\u00e7\u00e3o de uma termorresist\u00eancia<\/strong><\/h2>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/pt\/\/files\/2021\/09\/tr_widerstandsthermometer-002-20200303132007-388x329.jpg\" alt=\"Fig.: Vis\u00e3o transversal de uma termorresist\u00eancia\" title=\"Fig.: Vis\u00e3o transversal de uma termorresist\u00eancia\" \/><p class=\"wp-caption-text\">Fig.: Vis\u00e3o transversal de uma termorresist\u00eancia<\/p><\/div>\n    \n<p>Em uma termorresist\u00eancia ou RTD do ingl\u00eas Resistance Temperature Detector, a resist\u00eancia \u00e9 medida por meio de um condutor el\u00e9trico, onde h\u00e1 uma rela\u00e7\u00e3o claramente definida entre resist\u00eancia e temperatura, que pode ser representada em uma curva caracter\u00edstica. Nos processos de calibra\u00e7\u00e3o, s\u00e3o utilizados principalmente resistores de medi\u00e7\u00e3o de platina de fios em forma de mola\/espirais, em ingl\u00eas \u201cwirewound\u201d, como instrumentos de refer\u00eancia (PRT, ou seja, Platinum Resistance Thermometer), pois possuem uma alta faixa de temperatura, estabilidade de longa dura\u00e7\u00e3o e a maior exatid\u00e3o. O fio pode ser enrolado em um n\u00facleo de cer\u00e2mica ou de vidro.<\/p>\n<p>A termorresist\u00eancia de platina mais comum \u00e9 o Pt100. Este sensor \u00e9 uma termorresist\u00eancia de platina com exatamente 100 Ohms de resist\u00eancia el\u00e9trica a zero graus Celsius. Outros sensores PRTs, embora menos utilizados, s\u00e3o o Pt25 e o Pt1000, que possuem uma resist\u00eancia de 25 ohms e 1.000 ohms, respectivamente, a zero graus Celsius.<\/p>\n<h2><strong>Funcionalidade e \u00e1reas de aplica\u00e7\u00e3o de um termopar<\/strong><\/h2>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/pt\/\/files\/2021\/09\/tc_thermoelement-002-20200303132145-388x314.jpg\" alt=\"Fig.: Vis\u00e3o transversal de um termopar\" title=\"Fig.: Vis\u00e3o transversal de um termopar\" \/><p class=\"wp-caption-text\">Fig.: Vis\u00e3o transversal de um termopar<\/p><\/div>\n    \n<p>Os termopares utilizam um m\u00e9todo diferente para medir a temperatura. Um termopar consiste em dois fios feitos de metais diferentes, como n\u00edquel, cobre ou ferro. A temperatura no ponto de medi\u00e7\u00e3o faz com que as cargas nos fios mudem de forma diferente, resultando em uma tens\u00e3o el\u00e9trica que pode ser medida. Aqui, tamb\u00e9m existe uma depend\u00eancia definida entre a temperatura e a tens\u00e3o el\u00e9trica, raz\u00e3o pela qual a temperatura pode ser medida no ponto de medi\u00e7\u00e3o. Embora os termopares geralmente tenham uma precis\u00e3o e estabilidade mais baixas do que os sensores tipo termorresist\u00eancia, eles possuem uma faixa de temperatura mais ampla e podem medir temperaturas de at\u00e9 200 \u00b0C e 2500 \u00b0C.<\/p>\n<p>Dependendo do material utilizado, os termopares s\u00e3o calibrados para faixas espec\u00edficas. Alguns dos tipos mais comuns s\u00e3o J, K, T e E, os quais s\u00e3o considerados termopares de \u201cmetal b\u00e1sico\u201d. Sensores feitos de \u201cmetais nobres\u201d como R, S e B, por outro lado, s\u00e3o menos comuns e s\u00e3o usados principalmente em aplica\u00e7\u00f5es de alta temperatura.<\/p>\n<p><strong>Observa\u00e7\u00e3o<\/strong><br \/>\nPara mais informa\u00e7\u00f5es sobre nossos <a href=\"https:\/\/www.wika.com.br\/products_thermocouples_pt_br.WIKA\" class=\"ext-link\" rel=\"external nofollow\" onclick=\"this.target=&#039;_blank&#039;;\">termopares<\/a> e<a href=\"https:\/\/www.wika.com.br\/products_resistance_thermometers_pt_br.WIKA\" class=\"ext-link\" rel=\"external nofollow\" onclick=\"this.target=&#039;_blank&#039;;\"> termorresist\u00eancias<\/a> de refer\u00eancia, visite o site da WIKA. Em caso de d\u00favidas sobre calibra\u00e7\u00e3o de temperatura, entre em <a href=\"https:\/\/www.wika.com.br\/contact_pt_br.WIKA\" class=\"ext-link\" rel=\"external nofollow\" onclick=\"this.target=&#039;_blank&#039;;\">contato<\/a> conosco, ficaremos felizes em ajud\u00e1-lo.<\/p>\n<p>Veja como funcionam os termopares e termorresist\u00eancias nos v\u00eddeos a seguir:<\/p>\n<div data-fullscreen=\"disabled\" data-mode=\"normal\" data-oembed=\"1\" data-provider=\"youtube\" data-reset-after-played id=\"arve-youtube-hxmytpddn7g\" style=\"max-width:900px;\" class=\"arve\">\n<div class=\"arve-inner\">\n<div style=\"aspect-ratio:500\/281\" class=\"arve-embed arve-embed--has-aspect-ratio\">\n<div class=\"arve-ar\" style=\"padding-top:56.200000%\"><\/div>\n<p>\t\t\t<iframe allow=\"accelerometer &apos;none&apos;;autoplay &apos;none&apos;;bluetooth &apos;none&apos;;browsing-topics &apos;none&apos;;camera &apos;none&apos;;clipboard-read &apos;none&apos;;clipboard-write;display-capture &apos;none&apos;;encrypted-media &apos;none&apos;;gamepad &apos;none&apos;;geolocation &apos;none&apos;;gyroscope &apos;none&apos;;hid &apos;none&apos;;identity-credentials-get &apos;none&apos;;idle-detection &apos;none&apos;;keyboard-map &apos;none&apos;;local-fonts;magnetometer &apos;none&apos;;microphone &apos;none&apos;;midi &apos;none&apos;;otp-credentials &apos;none&apos;;payment &apos;none&apos;;picture-in-picture;publickey-credentials-create &apos;none&apos;;publickey-credentials-get &apos;none&apos;;screen-wake-lock &apos;none&apos;;serial &apos;none&apos;;summarizer &apos;none&apos;;sync-xhr;usb &apos;none&apos;;web-share;window-management &apos;none&apos;;xr-spatial-tracking &apos;none&apos;;\" allowfullscreen=\"\" class=\"arve-iframe fitvidsignore\" credentialless data-arve=\"arve-youtube-hxmytpddn7g\" data-lenis-prevent=\"\" data-src-no-ap=\"https:\/\/www.youtube-nocookie.com\/embed\/HXMytpddn7g?feature=oembed&amp;iv_load_policy=3&amp;modestbranding=1&amp;rel=0&amp;autohide=1&amp;playsinline=0&amp;autoplay=0&amp;enablejsapi=1\" frameborder=\"0\" height=\"505.8\" loading=\"lazy\" name=\"\" referrerpolicy=\"strict-origin-when-cross-origin\" sandbox=\"allow-scripts allow-same-origin allow-presentation allow-popups allow-popups-to-escape-sandbox\" scrolling=\"no\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/HXMytpddn7g?feature=oembed&#038;iv_load_policy=3&#038;modestbranding=1&#038;rel=0&#038;autohide=1&#038;playsinline=0&#038;autoplay=0&#038;enablejsapi=1\" title=\"How does a resistance thermometer work? | Resistance thermometers per IEC 60751\" width=\"900\"><\/iframe><\/p><\/div>\n<\/p><\/div>\n<p>\t<script type=\"application\/ld+json\">{\"@context\":\"http:\\\/\\\/schema.org\\\/\",\"@id\":\"https:\\\/\\\/blog.wika.com\\\/pt\\\/know-how\\\/calibracao-de-temperatura-termopares-vs-termorresistencias\\\/#arve-youtube-hxmytpddn7g\",\"type\":\"VideoObject\",\"embedURL\":\"https:\\\/\\\/www.youtube-nocookie.com\\\/embed\\\/HXMytpddn7g?feature=oembed&iv_load_policy=3&modestbranding=1&rel=0&autohide=1&playsinline=0&autoplay=0&enablejsapi=1\",\"name\":\"How does a resistance thermometer work? | Resistance thermometers per IEC 60751\",\"thumbnailUrl\":\"https:\\\/\\\/i.ytimg.com\\\/vi\\\/HXMytpddn7g\\\/hqdefault.jpg\",\"uploadDate\":\"2019-03-08T15:11:46Z\",\"author\":\"WIKA Group\",\"description\":\"What exactly is a resistance thermometer, a Pt100 or a Pt1000 sensor? How do Pt100 and Pt1000 resistance sensors differ? These and other important differences are explained in this video about electrical thermometers.\\n\\n#Temperature #ProcessControl #Thermometer #TemperatureMeasurement #IndustrialAutomation\\n\\n\\u25ac Contents of this video \\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac \\n0:00 Intro \\n0:12 Resistance thermometer working principle\\n0:47 Platinum resistance thermometer range\\n1:21 RTD: accuracy and standard measuring range\\n1:57 Pt100 temperature sensor: an industrial standard\\n2:10 Pt1000 and Pt25: for special cases\\n\\u00a0\\nUsually, two different types of electrical thermometers are used in industrial applications \\u2013 resistance thermometers and thermocouples. How thermocouples work is explained in this video:  With resistance thermometers, the temperature is determined using an ohmic measuring resistor. The \\u201cPt\\u201d in Pt100 stands for the chemical element platinum, the next digit indicates the resistance value of the sensor at zero degrees Celsius. The most frequently used measuring resistor, the Pt100, therefore has an electrical resistance of 100 \\u03a9 (ohms) at 0 \\u00b0C. In special applications, Pt1000 temperature sensors are also used. As the temperature drops or rises, the electrical resistance changes \\u2013 following a defined characteristic curve which is regulated by international standards. The temperature can be determined very precisely on the basis of the measured resistance.\\n\\u00a0\\nAccuracy and measuring ranges of Pt100\\\/Pt1000 temperature probes\\nAs with the traditional dial thermometer (see also our video for correct reading of thermometers:  the resistance thermometer has different accuracy classes. The following applies: The more accurately a resistance thermometer should measure, the more limited its permissible measuring range is. Likewise, you must also consider the type (design) of the measuring resistor.\\nIs a thin-film or wire-wound resistor used? Depending on the measuring resistor selected, there are different temperature measuring ranges based on the IEC 60751 standard. For example, class B wire-wound resistance thermometers have a defined measuring range of -196 \\u00b0C to a maximum of 600 \\u00b0C. If the temperature exceeds or drops below this range, the measured values of the temperature sensors begin to drift so they no longer measure within the defined accuracy and thus the measuring result is falsified. With the current level of technology, for thin-film sensors, this drift is stronger than with wire-wound sensors.\\n\\u00a0\\nFurther information on Pt100 and Pt1000 sensors can be found on our website: \\n\\u00a0\\n\\ud83d\\uded2 With WIKA, you can configure and order the most common resistance thermometers directly in the online shop:  \\n\\n\\ud83c\\udf10 You can find an overview of all resistance thermometers on our website: \\n\\u00a0\\n\\ud83d\\udcd6 Would you like to learn more about resistance thermometers? Then read our blog ( or the technical information on the subject \\u201cOperating limits and accuracies of platinum resistance thermometers per DIN EN IEC 60751\\u201d (\\n\\n-------------------------------------------------------------------------------\\n\\nFollow us on our social media channels:\\n\\ud83d\\udcfa YouTube: \\n\\u2705 LinkedIn:\"}<\/script><\/p>\n<\/div>\n<div data-fullscreen=\"disabled\" data-mode=\"normal\" data-oembed=\"1\" data-provider=\"youtube\" data-reset-after-played id=\"arve-youtube-9wp9u9wcqq0\" style=\"max-width:900px;\" class=\"arve\">\n<div class=\"arve-inner\">\n<div style=\"aspect-ratio:500\/281\" class=\"arve-embed arve-embed--has-aspect-ratio\">\n<div class=\"arve-ar\" style=\"padding-top:56.200000%\"><\/div>\n<p>\t\t\t<iframe allow=\"accelerometer &apos;none&apos;;autoplay &apos;none&apos;;bluetooth &apos;none&apos;;browsing-topics &apos;none&apos;;camera &apos;none&apos;;clipboard-read &apos;none&apos;;clipboard-write;display-capture &apos;none&apos;;encrypted-media &apos;none&apos;;gamepad &apos;none&apos;;geolocation &apos;none&apos;;gyroscope &apos;none&apos;;hid &apos;none&apos;;identity-credentials-get &apos;none&apos;;idle-detection &apos;none&apos;;keyboard-map &apos;none&apos;;local-fonts;magnetometer &apos;none&apos;;microphone &apos;none&apos;;midi &apos;none&apos;;otp-credentials &apos;none&apos;;payment &apos;none&apos;;picture-in-picture;publickey-credentials-create &apos;none&apos;;publickey-credentials-get &apos;none&apos;;screen-wake-lock &apos;none&apos;;serial &apos;none&apos;;summarizer &apos;none&apos;;sync-xhr;usb &apos;none&apos;;web-share;window-management &apos;none&apos;;xr-spatial-tracking &apos;none&apos;;\" allowfullscreen=\"\" class=\"arve-iframe fitvidsignore\" credentialless data-arve=\"arve-youtube-9wp9u9wcqq0\" data-lenis-prevent=\"\" data-src-no-ap=\"https:\/\/www.youtube-nocookie.com\/embed\/9wp9U9wCqQ0?feature=oembed&amp;iv_load_policy=3&amp;modestbranding=1&amp;rel=0&amp;autohide=1&amp;playsinline=0&amp;autoplay=0&amp;enablejsapi=1\" frameborder=\"0\" height=\"505.8\" loading=\"lazy\" name=\"\" referrerpolicy=\"strict-origin-when-cross-origin\" sandbox=\"allow-scripts allow-same-origin allow-presentation allow-popups allow-popups-to-escape-sandbox\" scrolling=\"no\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/9wp9U9wCqQ0?feature=oembed&#038;iv_load_policy=3&#038;modestbranding=1&#038;rel=0&#038;autohide=1&#038;playsinline=0&#038;autoplay=0&#038;enablejsapi=1\" title=\"Thermocouple basic working principles |  How does a thermocouple work?\" width=\"900\"><\/iframe><\/p><\/div>\n<\/p><\/div>\n<p>\t<script type=\"application\/ld+json\">{\"@context\":\"http:\\\/\\\/schema.org\\\/\",\"@id\":\"https:\\\/\\\/blog.wika.com\\\/pt\\\/know-how\\\/calibracao-de-temperatura-termopares-vs-termorresistencias\\\/#arve-youtube-9wp9u9wcqq0\",\"type\":\"VideoObject\",\"embedURL\":\"https:\\\/\\\/www.youtube-nocookie.com\\\/embed\\\/9wp9U9wCqQ0?feature=oembed&iv_load_policy=3&modestbranding=1&rel=0&autohide=1&playsinline=0&autoplay=0&enablejsapi=1\",\"name\":\"Thermocouple basic working principles |  How does a thermocouple work?\",\"thumbnailUrl\":\"https:\\\/\\\/i.ytimg.com\\\/vi\\\/9wp9U9wCqQ0\\\/hqdefault.jpg\",\"uploadDate\":\"2019-05-15T08:33:53Z\",\"author\":\"WIKA Group\",\"description\":\"What is a thermocouple and its working principles? What are the types of thermocouple and how do they work? Up to how many degrees Celsius or Fahrenheit can you use thermocouples? These and other basics are explained in this video.\\n\\n\\u25ac Contents of this video \\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac \\n00:00 - Intro \\n00:04 - How do thermocouples work?\\n00:55 - When is a reference junction compensation necessary when using thermocouples?\\n01:25 - What is a thermoelectric voltage curve and what material pairings are used for it?\\n01:58 - What are the types of thermocouples?\\n\\n#Thermocouple #ThermocoupleWorkingPrinciples #WIKAgroup #ThermocoupleTypes #HowThermocouplesWork \\n\\nThermocouples are made from two wires of different metals, which are in contact with each other at the measuring point. Due to their high vibration resistance, thermocouples that are welded firmly together are used in industrial applications. Thermocouples are temperature sensors that generate a voltage directly dependent on temperature. Compared to resistance thermometers, they are particularly suited for high temperatures up to 1,700 \\u00b0C. \\n\\nThere are a variety of thermocouple types that are suitable for a number of temperature ranges. Their accuracies are defined by the standards IEC 60584-1 and ASTM E230 and can be read in limit value tables. \\n\\n-------------------------------------------------------------------------------\\n\\u00a0\\n\\ud83d\\udd27 A detailed explanation of the \\u201cuse of thermocouples\\u201d can be found in our Technical information IN 00.23, which you can download free of charge from our website: \\n \\n\\ud83c\\udf10 Through our product configurator, which is available for the different types, you can assemble the perfect thermocouple for your application: \\n \\n\\ud83d\\udcf0 Please also read our trade article on \\u201cSpoilt for choice  - Criteria for selecting the most suitable electrical temperature measuring point\\u201d:  \\n \\n\\ud83d\\udcd6 In the following blog post we explain to you mineral-insulated cables, which are important components of electrical thermometers: \\n\\n\\ud83d\\udcfa How a resistance thermometer works is explained in this video: \\n\\n-------------------------------------------------------------------------------\\n\\nFollow us on our social media channels:\\n\\ud83d\\udcfa YouTube: \\n\\ud83c\\udfaf LinkedIn:\"}<\/script><\/p>\n<\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Na calibra\u00e7\u00e3o de temperatura, altas demandas s\u00e3o exigidas dos term\u00f4metros de refer\u00eancia em termos de exatid\u00e3o e reprodutibilidade e, portanto, estabilidade de longa dura\u00e7\u00e3o. Assim, os sensores de resist\u00eancia, aqui especificamente termorresist\u00eancias de platina e os termopares s\u00e3o utilizados em laborat\u00f3rios. Embora tenham uma fun\u00e7\u00e3o semelhante, em muitos aspectos n\u00e3o poderiam ser mais diferentes. Ao [&hellip;]<\/p>\n","protected":false},"author":147,"featured_media":10097,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13],"tags":[],"class_list":["post-10092","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-know-how"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Termopares vs. Termorresist\u00eancias- WIKA blog<\/title>\n<meta name=\"description\" content=\"Na calibra\u00e7\u00e3o de temperatura, altas demandas s\u00e3o exigidas dos term\u00f4metros de refer\u00eancia em termos de exatid\u00e3o e reprodutibilidade.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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