{"id":7392,"date":"2017-03-28T07:23:54","date_gmt":"2017-03-28T10:23:54","guid":{"rendered":"https:\/\/blog.wika.com\/pt\/\/?p=7392"},"modified":"2025-04-04T09:56:24","modified_gmt":"2025-04-04T12:56:24","slug":"pt100-pt1000-ou-ntc-qual-e-o-elemento-de-medicao-correto","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/pt\/know-how\/pt100-pt1000-ou-ntc-qual-e-o-elemento-de-medicao-correto\/","title":{"rendered":"Pt100, Pt1000 ou NTC \u2013 qual \u00e9 o elemento de medi\u00e7\u00e3o correto?"},"content":{"rendered":"<p><strong>Especialmente no segmento de fabrica\u00e7\u00e3o de m\u00e1quinas e equipamentos, os clientes nos perguntam qual seria o correto elemento de medi\u00e7\u00e3o para eles. Por esta raz\u00e3o, neste artigo pretendemos explicar as diferen\u00e7as entre os resistores de medi\u00e7\u00e3o mais comuns:\u00a0sonda de temperatura Pt100, Pt1000 e NTC. Na compara\u00e7\u00e3o no final do artigo, tamb\u00e9m h\u00e1 os elementos de medi\u00e7\u00e3o menos usados Ni1000 e KTY.<\/strong><\/p>\n<h2>Pt100, Pt1000 ou NTC?<\/h2>\n<p>As termorresist\u00eancias com base em\u00a0sondas de temperatura Pt100, Pt1000 (coeficiente positivo de temperatura PTC) e NTC (coeficiente negativo de temperatura) s\u00e3o utilizadas em aplica\u00e7\u00f5es industriais onde baixas e medias temperaturas s\u00e3o medidas. Na ind\u00fastria de processo, as sondas de temperatura\u00a0<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 e Pt1000<\/a> s\u00e3o utilizadas quase exclusivamente ao inv\u00e9s do NTC, n\u00e3o menos importante por raz\u00f5es de custo, pois este \u00e9 frequentemente utilizado no segmento de fabrica\u00e7\u00e3o de m\u00e1quinas e equipamentos. Por\u00e9m como mais recentemente tamb\u00e9m as sondas de temperatura Pt100 e Pt1000 s\u00e3o fabricados com a tecnologia \u201cthin film\u201d, \u00e9 poss\u00edvel reduzir a uma quantidade bastante pequena de platina nos resistores. Como resultado disso, a diferen\u00e7a de pre\u00e7o comparado ao NTC tamb\u00e9m foi reduzida, ent\u00e3o uma mudan\u00e7a de um NTC para Pt100 ou Pt1000 torna-se interessante para quantidades menores. Especialmente, pois os resistores de medi\u00e7\u00e3o de platina oferecem vantagens significativas em rela\u00e7\u00e3o ao coeficiente negativo de temperatura (NTC).<\/p>\n<h2>Vantagens e desvantagens dos diferentes elementos de medi\u00e7\u00e3o<\/h2>\n<p>Os elementos de platina Pt100 e Pt1000 oferecem a vantagem de atender a normas internacionais (IEC 60751 \/ EN 60751). Pois devido a crit\u00e9rios espec\u00edficos de material e fabrica\u00e7\u00e3o, uma padroniza\u00e7\u00e3o de elementos semicondutores como de um NTC se torna bastante dif\u00edcil. Por esta raz\u00e3o, a possibilidade de substituir um sensor pelo outro \u00e9 limitada. Outras vantagens\u00a0das sondas de temperatura de platina s\u00e3o: Melhor estabilidade no longo prazo e melhor desempenho em ciclos de temperatura, uma maior faixa de temperatura assim como uma alta exatid\u00e3o de medi\u00e7\u00e3o e linearidade. Alta exatid\u00e3o de medi\u00e7\u00e3o e linearidade tamb\u00e9m s\u00e3o poss\u00edveis com um NTC, por\u00e9m apenas em uma faixa de temperatura limitada. Enquanto um Pt100 ou Pt1000 com a tecnologia \u201cthin film\u201d pode ser utilizado a temperaturas de at\u00e9 500\u00b0C, um NTC comum pode ser utilizado \u00e0 temperatura de at\u00e9 aproximadamente 150\u00b0C.<\/p>\n<h2>Influ\u00eancia do fio de liga\u00e7\u00e3o<\/h2>\n<p>A resist\u00eancia dos fios influ\u00eancia o valor de medi\u00e7\u00e3o de sensores de temperatura a dois fios e deve ser considerada. Em um cabo de cobre com uma se\u00e7\u00e3o transversal de 0,22 mm\u00b2 (aprox. 24 AWG), o seguinte valor deve ser usado como orienta\u00e7\u00e3o para um Pt100: 0,162 \u03a9\/m \u2192 0,42 \u00b0C\/m. Como alternativa, um Pt1000 tamb\u00e9m pode ser selecionado, no qual a influ\u00eancia do fio (com 0,04 \u00b0C\/m) \u00e9 10 vezes menor. A influ\u00eancia da resist\u00eancia do fio comparado \u00e0 resist\u00eancia base R25 para um elemento de medi\u00e7\u00e3o NTC \u00e9 bem menos percept\u00edvel. Por\u00e9m devido \u00e0 curva inclinada caracter\u00edstica do NTC, a influ\u00eancia dos fios em temperaturas mais elevadas aumenta consideravelmente.<\/p>\n<h2>Conclus\u00e3o<\/h2>\n<p>No caso de grandes quantidades, o uso de um resistor de medi\u00e7\u00e3o NTC ainda \u00e9 justificado devido \u00e0s raz\u00f5es de custo. Por\u00e9m, para quantidades menores, recomendamos o uso de um resistor de medi\u00e7\u00e3o de platina. O uso de um Pt1000 fabricado na tecnologia \u201cthin film\u201d \u00e9 um meio termo perfeito entre custo e a exatid\u00e3o de medi\u00e7\u00e3o. Na seguinte tabela, elaboramos as vantagens e desvantagens dos diferentes elementos de medi\u00e7\u00e3o em uma vis\u00e3o geral:<\/p>\n<table style=\"border-color: #686663;background-color: #d9d9d9;height: 399px\" border=\"1\">\n<tbody>\n<tr style=\"height: 49px\">\n<td style=\"height: 49px;width: 448px\"><strong>Vantagens e desvantagens dos diferentes elementos de medi\u00e7\u00e3o<\/strong><\/td>\n<td style=\"height: 49px;width: 59px\">NTC<\/td>\n<td style=\"height: 49px;width: 67px\">Pt100<\/td>\n<td style=\"height: 49px;width: 75px\">Pt1000<\/td>\n<td style=\"height: 49px;width: 75px\">Ni1000<\/td>\n<td style=\"height: 49px;width: 58px\">KTY<\/td>\n<\/tr>\n<tr style=\"height: 50px\">\n<td style=\"height: 50px;width: 448px\">Faixa de temperatura<\/td>\n<td style=\"height: 50px;width: 59px\">&#8211;<\/td>\n<td style=\"height: 50px;width: 67px\">++<\/td>\n<td style=\"height: 50px;width: 75px\">++<\/td>\n<td style=\"height: 50px;width: 75px\">+<\/td>\n<td style=\"height: 50px;width: 58px\">&#8211;<\/td>\n<\/tr>\n<tr style=\"height: 50px\">\n<td style=\"height: 50px;width: 448px\">Exatid\u00e3o<\/td>\n<td style=\"height: 50px;width: 59px\">&#8211;<\/td>\n<td style=\"height: 50px;width: 67px\">++<\/td>\n<td style=\"height: 50px;width: 75px\">++<\/td>\n<td style=\"height: 50px;width: 75px\">+<\/td>\n<td style=\"height: 50px;width: 58px\">&#8211;<\/td>\n<\/tr>\n<tr style=\"height: 50px\">\n<td style=\"height: 50px;width: 448px\">Linearidade<\/td>\n<td style=\"height: 50px;width: 59px\">&#8211;<\/td>\n<td style=\"height: 50px;width: 67px\">++<\/td>\n<td style=\"height: 50px;width: 75px\">++<\/td>\n<td style=\"height: 50px;width: 75px\">+<\/td>\n<td style=\"height: 50px;width: 58px\">++<\/td>\n<\/tr>\n<tr style=\"height: 50px\">\n<td style=\"height: 50px;width: 448px\">Estabilidade ao longo prazo<\/td>\n<td style=\"height: 50px;width: 59px\">+<\/td>\n<td style=\"height: 50px;width: 67px\">++<\/td>\n<td style=\"height: 50px;width: 75px\">++<\/td>\n<td style=\"height: 50px;width: 75px\">++<\/td>\n<td style=\"height: 50px;width: 58px\">+<\/td>\n<\/tr>\n<tr style=\"height: 50px\">\n<td style=\"height: 50px;width: 448px\">Normas internacionais<\/td>\n<td style=\"height: 50px;width: 59px\">&#8211;<\/td>\n<td style=\"height: 50px;width: 67px\">++<\/td>\n<td style=\"height: 50px;width: 75px\">++<\/td>\n<td style=\"height: 50px;width: 75px\">+<\/td>\n<td style=\"height: 50px;width: 58px\">&#8211;<\/td>\n<\/tr>\n<tr style=\"height: 50px\">\n<td style=\"height: 50px;width: 448px\">Sensibilidade de temperatura (dR\/dT)<\/td>\n<td style=\"height: 50px;width: 59px\">++<\/td>\n<td style=\"height: 50px;width: 67px\">&#8211;<\/td>\n<td style=\"height: 50px;width: 75px\">+<\/td>\n<td style=\"height: 50px;width: 75px\">+<\/td>\n<td style=\"height: 50px;width: 58px\">+<\/td>\n<\/tr>\n<tr style=\"height: 50px\">\n<td style=\"height: 50px;width: 448px\">Influ\u00eancia do fio de alimenta\u00e7\u00e3o<\/td>\n<td style=\"height: 50px;width: 59px\">++<\/td>\n<td style=\"height: 50px;width: 67px\">&#8211;<\/td>\n<td style=\"height: 50px;width: 75px\">+<\/td>\n<td style=\"height: 50px;width: 75px\">+<\/td>\n<td style=\"height: 50px;width: 58px\">+<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>As curvas caracter\u00edsticas dos diferentes elementos de medi\u00e7\u00e3o podem ser visualizadas no seguinte gr\u00e1fico:<\/p>\n\n      <div class=\"wp-caption aligncenter\" style=\"max-width:846px;\"><a href=\"https:\/\/blog.wika.com\/de\/wp-content\/blogs.dir\/14\/files\/2015\/12\/blog_2015-10_kennlinienmesselemente_rdss-838x471.jpg\" class=\"local-link\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/de\/wp-content\/blogs.dir\/14\/files\/2015\/12\/blog_2015-10_kennlinienmesselemente_rdss-838x471.jpg\" alt=\"Curvas caracter\u00edsticas dos diferentes elementos de medi\u00e7\u00e3o\" \/><\/a><p class=\"wp-caption-text\">Curvas caracter\u00edsticas dos diferentes elementos de medi\u00e7\u00e3o<\/p><\/div>\n    \n<p>&nbsp;<\/p>\n<p><strong>Observa\u00e7\u00e3o<\/strong><br \/>\nNossos <a href=\"https:\/\/www.wika.com\/pt-br\/construcao_de_maquinas_e_automacao.WIKA\" target=\"_blank\" rel=\"noopener external nofollow\" class=\"ext-link\" onclick=\"this.target=&#039;_blank&#039;;\">sensores de temperatura para o segmento de fabrica\u00e7\u00e3o de m\u00e1quinas e equipamentos<\/a> est\u00e3o dispon\u00edveis com todos os elementos de medi\u00e7\u00e3o comumente utilizados. Voc\u00ea encontrar\u00e1 mais informa\u00e7\u00f5es no site da WIKA.<\/p>\n<p>Por favor, tamb\u00e9m assista ao v\u00eddeo a seguir para saber mais sobre as diferen\u00e7as entre um sensor de resist\u00eancia Pt100 e Pt1000:<\/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\\\/pt100-pt1000-ou-ntc-qual-e-o-elemento-de-medicao-correto\\\/#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","protected":false},"excerpt":{"rendered":"<p>Especialmente no segmento de fabrica\u00e7\u00e3o de m\u00e1quinas e equipamentos, os clientes nos perguntam qual seria o correto elemento de medi\u00e7\u00e3o para eles. Por esta raz\u00e3o, neste artigo pretendemos explicar as diferen\u00e7as entre os resistores de medi\u00e7\u00e3o mais comuns:\u00a0sonda de temperatura Pt100, Pt1000 e NTC. Na compara\u00e7\u00e3o no final do artigo, tamb\u00e9m h\u00e1 os elementos de [&hellip;]<\/p>\n","protected":false},"author":147,"featured_media":7396,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13],"tags":[348,349,350,340,647,352,351],"class_list":["post-7392","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-know-how","tag-ntc","tag-pt100","tag-pt1000","tag-sensor-de-temperatura","tag-sondas-de-temperatura","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>Pt100, Pt1000 ou NTC- Elementos de medi\u00e7\u00e3o - WIKA Blog<\/title>\n<meta name=\"description\" content=\"Neste artigo pretendemos explicar as diferen\u00e7as entre os resistores de medi\u00e7\u00e3o mais comuns Pt100, Pt1000 e NTC. 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