{"id":19539,"date":"2026-09-03T14:00:00","date_gmt":"2026-09-03T12:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=19539"},"modified":"2026-09-14T15:34:53","modified_gmt":"2026-09-14T13:34:53","slug":"232-inerzia-termica-vs-temperatura-ambiente","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2026\/09\/03\/232-inerzia-termica-vs-temperatura-ambiente\/","title":{"rendered":"#232 INERZIA TERMICA VS TEMPERATURA AMBIENTE"},"content":{"rendered":"\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-1 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">La temperatura aumenta e sono infiniti i motivi per cui questo pu\u00f2 accadere. Per evitare che possa arrivare a danneggiare una qualsiasi apparecchiatura si predispone un dispositivo di sicurezza termica, che interviene interrompendo il passaggio di corrente. Questa azione per\u00f2 non garantisce automaticamente il salvataggio della macchina perch\u00e9 non dobbiamo scordarci che <strong><a href=\"https:\/\/rdcomponents.com\/site\/2022\/06\/30\/41-inerzia-termica\/\" data-type=\"link\" data-id=\"https:\/\/rdcomponents.com\/site\/2022\/06\/30\/41-inerzia-termica\/\" target=\"_blank\" rel=\"noreferrer noopener\">si deve prendere in considerazione l\u2019inerzia termica<\/a><\/strong>.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-2 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">La\u00a0<strong>temperatura\u00a0<\/strong>aumenta fintanto che il\u00a0<strong>circuito viene alimentato<\/strong>, poi tutto si ferma. A seconda della velocit\u00e0 con cui la temperatura \u00e8 arrivata alla soglia di intervento, la stessa proseguir\u00e0 per un periodo di tempo variabile. L&#8217;intensit\u00e0 termica andr\u00e0 poi gradualmente a diminuire. Parliamo della cosiddetta\u00a0<strong><em>inerzia termica<\/em><\/strong>.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-3 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">Pu\u00f2 trattarsi di un\u00a0<strong>tempo estremamente ristretto<\/strong>\u00a0che si traduce in\u00a0<strong>pochissimi\u00a0gradi\u00a0<\/strong>che in nessun modo possono recare danni. Ma quando le potenze in gioco sono alte la differenza tra\u00a0<strong>temperatura\u00a0d\u2019intervento<\/strong>\u00a0e\u00a0<strong>temperatura raggiunta<\/strong>\u00a0a seguito dell\u2019<strong>inerzia termica<\/strong>\u00a0pu\u00f2 essere molto diversa. Questo potrebbe portare a una\u00a0<strong>temperatura ambiente estremamente pi\u00f9 alta<\/strong>\u00a0<strong>di quella di lavoro o d\u2019intervento<\/strong>. In questo caso \u00e8 bene assicurarsi che questo fenomeno\u00a0<strong>non possa compromettere<\/strong>\u00a0<strong>dispositivi<\/strong>,\u00a0<strong>componenti<\/strong>,\u00a0<strong>macchine<\/strong>\u00a0o altro.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-4 wp-block-paragraph\" style=\"color:#222222;font-size:16px\"><strong><a href=\"https:\/\/rdcomponents.com\/site\/2022\/06\/09\/38-temperatura-ambiente\/\" target=\"_blank\" rel=\"noreferrer noopener\">La temperatura ambiente<\/a><\/strong>&nbsp;\u00e8 quella temperatura che troviamo, lo dice la parola stessa, nell\u2019ambiente dove il nostro dispositivo \u00e8 applicato e va a lavorare. Per ambiente va considerato in maniera stretta il&nbsp;<strong>luogo esatto<\/strong>&nbsp;dove esso viene posizionato. Quindi, se viene posizionato all\u2019interno di una&nbsp;<strong>macchina<\/strong>, dentro una&nbsp;<strong>scatola<\/strong>, piuttosto che in un&nbsp;<strong>armadio<\/strong>, saranno questi gli ambienti, indipendentemente dalla posizione o dal luogo in cui queste macchine o questi armadi si trovano.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-5 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">Questo \u00e8 il motivo per cui le temperature d\u2019intervento dei termostati sono quasi sempre molto superiori a qualsiasi temperatura a cui \u00e8 abituato l\u2019essere umano. Infatti, queste vanno oltre i&nbsp;<strong>100\u00b0C<\/strong>, oltre i<strong>&nbsp;200\u00b0C<\/strong>&nbsp;e nel caso dei termostati&nbsp;<strong><a href=\"https:\/\/rdcomponents.com\/site\/termostati-bimetallici\/\" target=\"_blank\" rel=\"noreferrer noopener\">TK24<\/a>&nbsp;THERMOREX&nbsp;<\/strong>possiamo arrivare fino a&nbsp;<strong>425\u00b0C<\/strong>. Nell\u2019ambiente in cui saranno applicati si potr\u00e0 raggiungere quella temperatura, ma non si dovr\u00e0 andare oltre.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-6 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">Se \u00e8 previsto che un termostato possa arrivare a trovarsi in un ambiente con temperature alte, allora bisogner\u00e0 accertarsi che i materiali che lo compongono possano&nbsp;<strong>resistere a quelle temperature<\/strong>. Per esempio, i modelli&nbsp;<strong><a href=\"https:\/\/rdcomponents.com\/site\/termostati-bimetallici\/\" target=\"_blank\" rel=\"noreferrer noopener\">TK24<\/a>&nbsp;<\/strong>e&nbsp;<strong><a href=\"https:\/\/rdcomponents.com\/site\/termostati-bimetallici\/#tk32\" target=\"_blank\" rel=\"noreferrer noopener\">TK32<\/a>&nbsp;<\/strong>al di sopra dei&nbsp;<strong>150\u00b0C<\/strong>&nbsp;vengono costruiti con un&nbsp;<strong>corpo ceramico<\/strong>.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1372\" src=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2026\/09\/BulbiTK24TK32SW-scaled.jpg\" alt=\"\" class=\"wp-image-19541\" style=\"width:800px;height:auto\" srcset=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2026\/09\/BulbiTK24TK32SW-scaled.jpg 2560w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2026\/09\/BulbiTK24TK32SW-300x161.jpg 300w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2026\/09\/BulbiTK24TK32SW-150x80.jpg 150w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2026\/09\/BulbiTK24TK32SW-767x411.jpg 767w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2026\/09\/BulbiTK24TK32SW-1024x549.jpg 1024w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2026\/09\/BulbiTK24TK32SW-1536x823.jpg 1536w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-7 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">In genere, dove la temperatura pu\u00f2 salire in modo compromettente, i progetti prevedono&nbsp;<strong>sistemi di dissipazione del calore<\/strong>&nbsp;e anche interventi diretti come&nbsp;<strong>ventole di raffreddamento<\/strong>. Queste vengono azionate da&nbsp;<a href=\"https:\/\/rdcomponents.com\/site\/termostati-bimetallici\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>termostati<\/strong><\/a>&nbsp;(o&nbsp;<strong><a href=\"https:\/\/rdcomponents.com\/site\/protettori-termici\/\" target=\"_blank\" rel=\"noreferrer noopener\">protettori termici<\/a><\/strong>) con <a href=\"https:\/\/rdcomponents.com\/site\/2021\/12\/16\/16-termostati-con-contatti-normalmente-aperti\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>contatti normalmente aperti<\/strong><\/a>, o&nbsp;<strong><a href=\"https:\/\/rdcomponents.com\/site\/2025\/01\/23\/158-contatti-in-scambio\/\" target=\"_blank\" rel=\"noreferrer noopener\">con contatti in scambio<\/a><\/strong>, un&nbsp;<strong><a href=\"https:\/\/rdcomponents.com\/site\/2022\/12\/15\/62-da-spst-a-3pst\/\" target=\"_blank\" rel=\"noreferrer noopener\">SPDT<\/a><\/strong>&nbsp;per intenderci. Significa che, raggiunta la temperatura prevista, le&nbsp;<strong>ventole si azionano<\/strong>&nbsp;e contemporaneamente&nbsp;<strong>viene sospesa l\u2019alimentazione del circuito<\/strong>, la temperatura scende e l\u2019applicazione \u00e8 salva.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-8 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">Ci sono un paio di occasioni pericolose in cui un imprevisto aumento della temperatura pu\u00f2 in un caso&nbsp;<strong>compromettere il funzionamento del dispositivo<\/strong>, e nell\u2019altro pu\u00f2 pericolosamente&nbsp;<strong>generare una riattivazione del circuito<\/strong>.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-9 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">Il primo caso \u00e8 quello dei&nbsp;<strong>termostati a bulbo di sicurezza<\/strong>. Se si supera una determinata temperatura, la&nbsp;<strong>membrana<\/strong>, o&nbsp;<strong>valvola<\/strong>, che porta all\u2019apertura dei contatti in seguito all\u2019espansione del&nbsp;<strong>gas&nbsp;<\/strong>o del&nbsp;<strong>liquido&nbsp;<a href=\"https:\/\/rdcomponents.com\/site\/2022\/05\/19\/36-termostati-a-bulbo\/\" data-type=\"link\" data-id=\"https:\/\/rdcomponents.com\/site\/2022\/05\/19\/36-termostati-a-bulbo\/\" target=\"_blank\" rel=\"noreferrer noopener\">contenuto nel bulbo e nel&nbsp;capillare<\/a><\/strong>, potrebbe danneggiarsi irrimediabilmente. In questo modo il termostato interviene ma non si ripristina nemmeno forzando il&nbsp;<strong>pulsante di riarmo<\/strong>. Per questo motivo un&nbsp;<strong><a href=\"https:\/\/rdcomponents.com\/site\/2021\/11\/11\/11-qualita-o-prestazioni\/\" target=\"_blank\" rel=\"noreferrer noopener\">termostato a bulbo di buona qualit\u00e0 e con buone prestazioni<\/a><\/strong> avr\u00e0 una temperatura di resistenza massima del bulbo di almeno&nbsp;<strong>70&nbsp;<\/strong>\u2013&nbsp;<strong>80\u00b0C<\/strong>. Alcune Case si limitano a garantire un&nbsp;<strong>10&nbsp;<\/strong>\u2013&nbsp;<strong>15%<\/strong>&nbsp;in pi\u00f9 oltre l\u2019intervento. In questo caso, il termostato far\u00e0 comunque il suo lavoro e interverr\u00e0, ma poi sar\u00e0 da sostituire.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-10 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">Il secondo caso invece riguarda i&nbsp;<strong><a href=\"https:\/\/rdcomponents.com\/site\/2021\/11\/04\/10-come-funzionano-i-termofusibili\/\" target=\"_blank\" rel=\"noreferrer noopener\">termofusibili<\/a><\/strong>. Sappiamo che il&nbsp;<strong>TF&nbsp;<\/strong>(<strong><em>Functioning temperature<\/em><\/strong>) \u00e8 la temperatura alla quale il&nbsp;<strong>thermal pellet<\/strong>&nbsp;passa dallo stato solido a quello liquido provocando l\u2019<strong>apertura del circuito elettrico<\/strong>. Sappiamo anche che il&nbsp;<strong>TH&nbsp;<\/strong>(<strong><em>Holding temperature<\/em><\/strong>) \u00e8 la temperatura massima alla quale il termofusibile pu\u00f2 lavorare senza innescare un processo di invecchiamento precoce del thermal pellet e danneggiarsi per&nbsp;<strong>168&nbsp;<\/strong>ore.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-11 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">Infine, abbiamo analizzato il&nbsp;<strong>TM&nbsp;<\/strong>(<strong><em>Maximum temperature Limit<\/em><\/strong>). Questa \u00e8 la temperatura massima alla quale le propriet\u00e0 meccaniche ed elettriche del termofusibile possono essere mantenute per dieci minuti senza rischio di&nbsp;<strong>ripristino&nbsp;<\/strong>della&nbsp;<strong>conducibilit\u00e0&nbsp;elettrica&nbsp;<\/strong>e conseguente ritorno al funzionamento. Se questa temperatura viene raggiunta e mantenuta oltre i limiti, la situazione pu\u00f2 diventare molto pericolosa. Il dispositivo, intervenuto per proteggere l\u2019applicazione,&nbsp;<strong>torna a funzionare<\/strong>&nbsp;e non rimangono altri dispositivi di sicurezza oltre al&nbsp;<strong>termofusibile<\/strong>. <\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-12 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">A onor del vero va detto che il&nbsp;<strong><em>Tm&nbsp;<\/em><\/strong>\u00e8 in genere molto pi\u00f9 altro del&nbsp;<strong><em>Tf<\/em><\/strong>. Questo dovrebbe rendere particolarmente difficile il raggiungimento di tale temperatura. Tuttavia, la prudenza non \u00e8 mai troppa ed \u00e8 importante considerare il maggior numero di&nbsp;<strong>fattori di rischio<\/strong>&nbsp;quando si sviluppa un nuovo progetto. \u00c8 molto importante valutare e scegliere il prodotto giusto da usare e confrontarsi con addetti ai lavori e con gli&nbsp;<strong>uffici&nbsp;tecnici&nbsp;<\/strong>delle&nbsp;<strong>Case&nbsp;produttrici<\/strong>.<\/p>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-13 wp-block-paragraph\" style=\"color:#222222;font-size:16px\">Questa prassi per&nbsp;<strong>R&amp;D Components<\/strong>&nbsp;rappresenta la normalit\u00e0 operativa. Saremo contenti di poter mettere tutta la nostra esperienza, e quella dei nostri partner, al vostro servizio, per rendere i vostri progetti i pi\u00f9 performanti che ci possano essere.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>La temperatura aumenta e sono infiniti i motivi per cui questo pu\u00f2 accadere. Per evitare che possa arrivare a danneggiare una qualsiasi apparecchiatura si predispone un dispositivo di sicurezza termica, che interviene interrompendo il passaggio di corrente. Questa azione per\u00f2 non garantisce automaticamente il salvataggio&#8230;<\/p>\n","protected":false},"author":2,"featured_media":19541,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239],"tags":[219,210],"class_list":["post-19539","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-funzionamento-tecnico","tag-inerzia-termica","tag-temperatura-ambiente"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>#232 INERZIA TERMICA VS TEMPERATURA AMBIENTE -<\/title>\n<meta name=\"description\" content=\"Cosa succede quando l&#039;inerzia termica in un dispositivo porta la temperatura ambiente ben oltre la temperatura d&#039;intervento del componente?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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