{"id":12880,"date":"2021-12-16T14:00:00","date_gmt":"2021-12-16T13:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=12880"},"modified":"2025-01-28T16:57:56","modified_gmt":"2025-01-28T15:57:56","slug":"16-termostati-con-contatti-normalmente-aperti","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2021\/12\/16\/16-termostati-con-contatti-normalmente-aperti\/","title":{"rendered":"#16 – Termostati con contatti normalmente aperti"},"content":{"rendered":"\n
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Anche oggi torno sul fenomeno di apertura e chiusura dei contatti elettrici del termostato bimetallico. Fermo restando tutto quello spiegato in \u201cChe cosa provoca l’apertura o la chiusura dei contatti in un dispositivo bimetallico<\/a>\u201d, lo affronter\u00f2 sotto un diverso punto di vista, vale a dire il caso in cui il contatto sia inizialmente aperto.<\/p>\n\n\n\n

Abbiamo gi\u00e0 detto che il bimetallo si piega per effetto del diverso coefficiente di dilatazione dei metalli che lo compongono e in seguito alla variazione della temperatura. Finora abbiamo parlato del caso in cui i contatti elettrici del termostato erano chiusi, e il raggiungimento della temperatura stabilita portava all\u2019apertura dei contatti e del circuito.<\/p>\n\n\n\n

Ma pu\u00f2 avvenire anche il processo inverso: i contatti sono aperti (Fig.1) e quando si raggiunge la temperatura stabilita si chiudono (Fig. 2).<\/p>\n\n\n\n

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\"contatti\"<\/figure>\n<\/div>\n\n\n
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Contatti normalmente aperti: un esempio<\/h2>\n\n\n\n
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I contatti normalmente aperti possono dare luogo a diverse interpretazioni e creare confusione.<\/p>\n\n\n\n

In questa circostanza voglio affrontare un caso tipico. Il termostato viene definito \u201cnormalmente aperto\u201d e interviene a una temperatura superiore a quella ambiente. Questo termostato lavora, ad esempio, a 100\u00b0C; in una situazione di partenza a temperatura ambiente, ipotizzo 22\u00b0C, i contatti sono aperti e non passa corrente. Una semplice prova con un tester lo potr\u00e0 confermare senza problemi.<\/p>\n\n\n\n

Nel momento in cui la temperatura raggiunge i 100\u00b0C del nostro esempio, i contatti si chiudono e il termostato inizia a lavorare.<\/p>\n\n\n\n

I termostati con contatti normalmente aperti trovano impiego come dispositivi di sicurezza, ad esempio collegati con una ventola di raffreddamento, o con un segnalatore luminoso. <\/p>\n\n\n\n

Torniamo al precedente esempio, e immaginiamo che il nostro termostato bimetallico venga installato su un\u2019apparecchiatura, come pu\u00f2 essere un motore elettrico. Se surriscaldandosi raggiunge i 100\u00b0C del nostro esempio, allora i contatti andranno a chiudersi consentendo a una ventola o a un segnale acustico o luminoso, di iniziare a lavorare. Fin qui ho sempre parlato di termostati bimetallici, quindi nel nostro caso dei TK24, ma lo stesso principio pu\u00f2 essere utilizzato sui protettori termici, anche se con performance diverse (vedi \u201cQualit\u00e0 o prestazioni. Quando la gamma fa la differenza<\/a>\u201d). <\/p>\n\n\n\n

Sul nostro sito abbiamo dedicato un apposito gruppo di prodotti ai protettori termici normalmente aperti<\/a>. Abbiamo inserito solo le principali soluzioni, ma la gamma pu\u00f2 essere ulteriormente ampliata.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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

16-Termostati-normalmente-aperti<\/a>Download<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Anche oggi torno sul fenomeno di apertura e chiusura dei contatti elettrici del termostato bimetallico. Fermo restando tutto quello spiegato in \u201cChe cosa provoca l’apertura o la chiusura dei contatti in un dispositivo bimetallico\u201d, lo affronter\u00f2 sotto un diverso punto di vista, vale a dire il caso in cui…<\/p>\n","protected":false},"author":2,"featured_media":13520,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[236],"tags":[153,152,154,116,149],"class_list":["post-12880","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-prodotti","tag-contatti-elettrici","tag-normalmente-aperti","tag-temperatura","tag-termostati","tag-thermorex"],"yoast_head":"\n#16 - Termostati con contatti normalmente aperti - R&d Components Srl<\/title>\n<meta name=\"description\" content=\"Come funziona un termostato con contatti normalmente aperti? 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Ferranti","author_link":"https:\/\/rdcomponents.com\/site\/author\/roberto\/"},"rttpg_comment":0,"rttpg_category":"<a href=\"https:\/\/rdcomponents.com\/site\/category\/prodotti\/\" rel=\"category tag\">Prodotti<\/a>","rttpg_excerpt":"Anche oggi torno sul fenomeno di apertura e chiusura dei contatti elettrici del termostato bimetallico. Fermo restando tutto quello spiegato in \u201cChe cosa provoca l’apertura o la chiusura dei contatti in un dispositivo bimetallico\u201d, lo affronter\u00f2 sotto un diverso punto di vista, vale a dire il caso in cui...","_links":{"self":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/12880","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/comments?post=12880"}],"version-history":[{"count":0,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/12880\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media\/13520"}],"wp:attachment":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media?parent=12880"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/categories?post=12880"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/tags?post=12880"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}