{"id":7838,"date":"2017-08-31T10:09:18","date_gmt":"2017-08-31T13:09:18","guid":{"rendered":"https:\/\/blog.wika.com\/pt\/\/?p=7838"},"modified":"2025-04-04T10:05:38","modified_gmt":"2025-04-04T13:05:38","slug":"termopar-ou-termorresistencia","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/pt\/know-how\/termopar-ou-termorresistencia\/","title":{"rendered":"Termopar ou termorresist\u00eancia?"},"content":{"rendered":"<p><strong>Para a medi\u00e7\u00e3o eletr\u00f4nica de temperatura podemos encontrar dois tipos principais de termoelementos: os termopares e as termorresist\u00eancias. Esse artigo descreve o princ\u00edpio de funcionamento de cada um desses termoelementos e destaca as principais diferen\u00e7as entre eles.<\/strong><\/p>\n<h2>Termopar<\/h2>\n<p>A medi\u00e7\u00e3o de temperatura por <a href=\"https:\/\/www.wika.com\/pt-br\/termopares.WIKA\" target=\"_blank\" rel=\"noopener external nofollow\" class=\"ext-link\" onclick=\"this.target=&#039;_blank&#039;;\">termopares<\/a> ocorre atrav\u00e9s da jun\u00e7\u00e3o de dois condutores met\u00e1licos (metais diferentes) unidos nas extremidades formando um circuito. Essas jun\u00e7\u00f5es, submetidas a temperaturas diferentes geram uma for\u00e7a eletromotriz (fem); fen\u00f4meno conhecido como Efeito Seebeck. Quanto maior o gradiente de temperatura na extremidade do termopar, maior \u00e9 a energia cin\u00e9tica nos el\u00e9trons. Quanto maior essa energia cin\u00e9tica, mais os el\u00e9trons se acumulam no lado frio do termopar, ocasionando uma diferen\u00e7a de potencial el\u00e9trico entre as extremidades em forma de tens\u00e3o (mV). Ou seja, o termopar transforma diretamente energia t\u00e9rmica em energia cin\u00e9tica.<\/p>\n<p>Termopares s\u00e3o especialmente adequados para temperaturas elevadas at\u00e9 1.700 \u00b0C. As op\u00e7\u00f5es de instrumentos com bainha de isola\u00e7\u00e3o mineral s\u00e3o altamente resistentes contra vibra\u00e7\u00f5es (depende do tipo de instrumento, elemento sensor e das partes em contato com o processo). Os termopares WIKA est\u00e3o dispon\u00edveis com os limites de erros conforme normas ASTM E230 \/ IEC 60584.<\/p>\n<h2>Termorresist\u00eancia<\/h2>\n<p>A medi\u00e7\u00e3o por <a href=\"https:\/\/www.wika.com\/pt-br\/termorresistencia.WIKA\" target=\"_blank\" rel=\"noopener external nofollow\" class=\"ext-link\" onclick=\"this.target=&#039;_blank&#039;;\">termorresist\u00eancia<\/a> tem um coeficiente positivo de temperatura e ocorre atrav\u00e9s do princ\u00edpio da agita\u00e7\u00e3o t\u00e9rmica nos metais, ou seja, com o aumento da temperatura do meio h\u00e1 o aumento da resist\u00eancia el\u00e9trica da termorresist\u00eancia. As termorresist\u00eancias WIKA s\u00e3o adequadas para aplica\u00e7\u00f5es entre -200 &#8230; +600 \u00b0C (depende do tipo de instrumento, elemento sensor, classe de exatid\u00e3o e partes em contato com o processo). Para todas as termorresist\u00eancias as classes de exatid\u00e3o AA, A e B est\u00e3o dispon\u00edveis. Elas apresentam os limites de erros conforme IEC 60751.<\/p>\n<p>O principal tipo de termorresist\u00eancia \u00e9 <a href=\"https:\/\/www.wika.com\/pt-br\/lp_pt100_pt1000.WIKA?highlightedText=pt100\" target=\"_blank\" rel=\"noopener external nofollow\" class=\"ext-link\" onclick=\"this.target=&#039;_blank&#039;;\">Pt100<\/a>. O Pt100 \u00e9 uma termorresist\u00eancia feita de fios de Platina encapsulados em um bulbo de cer\u00e2mica ou vidro, na qual sua resist\u00eancia a zero grau c\u00e9lsius \u00e9 100 ohms. Em processos industriais, os sensores Pt100 s\u00e3o frequentemente os mais utilizados e mundialmente o tipo mais comum de termorresist\u00eancia.<\/p>\n<h2>Principais diferen\u00e7as entre termopar e termorresist\u00eancia<\/h2>\n<p><strong>Termopar:<\/strong><\/p>\n<ul>\n<li>Baseia-se na tens\u00e3o<\/li>\n<li>Maior resist\u00eancia a temperaturas<\/li>\n<li>Mais econ\u00f4micos<\/li>\n<\/ul>\n<p><strong>Termorresist\u00eancia:<\/strong><\/p>\n<ul>\n<li>Baseia-se na resist\u00eancia<\/li>\n<li>Maior precis\u00e3o<\/li>\n<li>Curva de resist\u00eancia em fun\u00e7\u00e3o da temperatura mais linear<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Para a medi\u00e7\u00e3o eletr\u00f4nica de temperatura podemos encontrar dois tipos principais de termoelementos: os termopares e as termorresist\u00eancias. Esse artigo descreve o princ\u00edpio de funcionamento de cada um desses termoelementos e destaca as principais diferen\u00e7as entre eles. Termopar A medi\u00e7\u00e3o de temperatura por termopares ocorre atrav\u00e9s da jun\u00e7\u00e3o de dois condutores met\u00e1licos (metais diferentes) unidos [&hellip;]<\/p>\n","protected":false},"author":160,"featured_media":7859,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13],"tags":[410,349,350,340,367,352,351],"class_list":["post-7838","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-know-how","tag-medicao-de-temperatura","tag-pt100","tag-pt1000","tag-sensor-de-temperatura","tag-termoelemento","tag-termopar","tag-termorresistncia"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Termopar ou termorresist\u00eancia? - WIKA blog<\/title>\n<meta name=\"description\" content=\"Para a medi\u00e7\u00e3o eletr\u00f4nica de temperatura podemos encontrar dois tipos principais de termoelementos: os termopares e as termorresist\u00eancias.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wika.com\/pt\/know-how\/termopar-ou-termorresistencia\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Termopar ou termorresist\u00eancia? 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