{"id":12944,"date":"2022-02-10T14:00:00","date_gmt":"2022-02-10T13:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=12944"},"modified":"2025-07-17T11:35:41","modified_gmt":"2025-07-17T09:35:41","slug":"22-termistori-ntc","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2022\/02\/10\/22-termistori-ntc\/","title":{"rendered":"#22 – Termistori NTC"},"content":{"rendered":"\n
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Proseguiamo con la nostra panoramica sul mondo dei sensori di temperatura. Dopo avere parlato dei termistori PTC<\/strong><\/a> affronteremo i termistori NTC<\/strong> (Negative Temperature Coefficient<\/em>). <\/p>\n\n\n\n

Si tratta di sensori che vengono realizzati tramite semiconduttori prodotti con ossidi di metallo drogati. Nel campo dei semiconduttori significa che vengono aggiunte piccole percentuali di atomi esterni, allo scopo di modificare le propriet\u00e0 elettroniche del materiale. <\/p>\n\n\n\n

Al contrario di quanto abbiamo visto per i PTC, con i termistori NTC la resistenza diminuisce con l\u2019aumentare della temperatura. Si tratta di un principio che venne scoperto da Michael Faraday<\/em> (1791 \u2013 1867) nel 1833, che not\u00f2 che la resistenza del solfuro d\u2019argento diminuiva drasticamente con l\u2019aumentare della temperatura. Ma in quegli anni la produzione di un simile sensore era molto complicata e costosa, cos\u00ec la loro commercializzazione massiva inizi\u00f2 solamente dopo il 1930, quando Samuel Ruben<\/em> (1900 \u2013 1988) invent\u00f2 e brevett\u00f2 il termistore NTC in una versione simile a quella che conosciamo oggi.<\/p>\n\n\n\n

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Termistori NTC: Caratteristiche tecniche<\/h3>\n\n\n\n

Il modo in cui la resistenza di un termistore diminuisce \u00e8 correlato a una costante, nota nell’industria dei termistori come beta (\u03b2). Il beta \u00e8 misurato in gradi Kelvin ed indica l\u2019arco di temperatura in cui \u00e8 valida la tolleranza. Normalmente questo intervallo di tempo va da 25\u00b0C a 85\u00b0C e il valore di resistenza che il sensore avr\u00e0 in relazione alle due diverse temperature contribuir\u00e0 a determinare il valore finale di Beta.<\/p>\n\n\n\n

Un altro valore che \u00e8 fondamentale per identificare la curva di un NTC \u00e8 la \u201cResistenza nominale\u201d. Vale a dire la resistenza (espressa in ohm \u03a9, quasi sempre nel nostro caso in K\u03a9) alla T0, che normalmente \u00e8 di 25\u00b0C.<\/p>\n\n\n\n

Ecco che per scegliere il sensore NTC pi\u00f9 adatto alla nostra applicazione dobbiamo seguire diversi passaggi, il primo dei quali \u00e8 quello di individuare gli elementi che determinano la curva RT (Resistenza \/ Temperatura<\/em>), quindi la Resistenza a 25\u00b0C e il valore di Beta, in gergo \u201cK e \u03b2\u201d.<\/p>\n\n\n\n

Fatto questo avremo poi l\u2019esecuzione della sonda, che altro non \u00e8 che una delle infinite soluzioni nelle quali pu\u00f2 essere realizzata una sonda NTC.<\/p>\n\n\n\n

R&D Components ha classificato questi tipi di termistori in due diverse famiglie: gli NTC<\/a> <\/strong>e gli NTC per riscaldamento<\/strong><\/a>.<\/p>\n\n\n\n

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Scarica l’articolo in versione stampabile cliccando qui sotto!<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

22-Termistori-NTC<\/a>Download<\/a><\/div>\n\n\n\n
<\/div>\n","protected":false},"excerpt":{"rendered":"

Proseguiamo con la nostra panoramica sul mondo dei sensori di temperatura. Dopo avere parlato dei termistori PTC affronteremo i termistori NTC (Negative Temperature Coefficient).  Si tratta di sensori che vengono realizzati tramite semiconduttori prodotti con ossidi di metallo drogati. Nel campo dei semiconduttori significa che vengono aggiunte piccole percentuali di…<\/p>\n","protected":false},"author":2,"featured_media":12946,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[236],"tags":[177,187,175],"class_list":["post-12944","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-prodotti","tag-ntc","tag-ntc-per-riscaldamento","tag-sensori"],"yoast_head":"\n#22 - Termistori NTC -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rdcomponents.com\/site\/2022\/02\/10\/22-termistori-ntc\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#22 - Termistori NTC -\" \/>\n<meta property=\"og:description\" content=\"Proseguiamo con la nostra panoramica sul mondo dei sensori di temperatura. Dopo avere parlato dei termistori PTC affronteremo i termistori NTC (Negative Temperature Coefficient).  Si tratta di sensori che vengono realizzati tramite semiconduttori prodotti con ossidi di metallo drogati. 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Dopo avere parlato dei termistori PTC affronteremo i termistori NTC (Negative Temperature Coefficient).  Si tratta di sensori che vengono realizzati tramite semiconduttori prodotti con ossidi di metallo drogati. 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