{"id":13906,"date":"2023-02-16T14:00:00","date_gmt":"2023-02-16T13:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=13906"},"modified":"2024-11-20T15:58:43","modified_gmt":"2024-11-20T14:58:43","slug":"69-e-se-il-serbatoio-e-mezzo-vuoto","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2023\/02\/16\/69-e-se-il-serbatoio-e-mezzo-vuoto\/","title":{"rendered":"#69 – E se il\u00a0serbatoio\u00a0\u00e8 mezzo vuoto?"},"content":{"rendered":"\n
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Vi parlo oggi di una particolare applicazione delle sonde di temperatura NTC<\/strong><\/a> e di una criticit\u00e0 che \u00e8 importante prevedere fin dalla progettazione. Fra le numerose applicazioni delle sonde di temperatura, indipendentemente dal sensore utilizzato<\/strong><\/a>, vi\u00a0\u00e8 quella di rilevare la temperatura di un liquido contenuto all\u2019interno di un\u00a0serbatoio. Poco importa che si tratti di acqua, gelato, cioccolato, caff\u00e8 o altro, la precisione nella lettura della temperatura pu\u00f2 essere influenzata dal livello di riempimento del\u00a0serbatoio. Un\u00a0serbatoio\u00a0pieno offrir\u00e0 una lettura precisa, mentre un\u00a0serbatoio\u00a0a met\u00e0 potr\u00e0 portare a errori. Questi errori aumenteranno con la progressiva riduzione del liquido presente nel contenitore.<\/p>\n\n\n\n

Questa problematica \u00e8 causata dal fatto che il sensore viene posto in posizione verticale, ed immerso per la sua gran parte nel liquido, ma non totalmente, per evitare di utilizzare un modello IP68<\/em> (ci torneremo pi\u00f9 avanti), che presenta prestazioni, ma anche costi, molto pi\u00f9 elevati.<\/p>\n\n\n\n

Il motivo \u00e8 che all\u2019interno del tubo metallico di protezione, detto anche bulbo, il termistore NTC \u00e8 posizionato sulla punta. La sua resistenza verr\u00e0 modificata in base al cambiamento di temperatura all’interno del tubo. <\/p>\n\n\n\n

Fondamentalmente si crea un microambiente, una camera interna e la temperatura che il sensore va a leggere \u00e8 quella che viene rilevata all\u2019interno del bulbo. Anche il bulbo per\u00f2 a sua volta viene condizionato da numerosi fattori esterni.<\/p>\n\n\n\n

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\"serbatoio\"<\/figure>\n<\/div>\n\n\n
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Vi faccio un esempio molto banale, che far\u00e0 inorridire i pi\u00f9 tecnici e preparati per la sua semplicit\u00e0.<\/p>\n\n\n\n

Immaginate di essere in una stanza rettangolare. Vi posizionate su un estremo e non lontano da voi abbiamo un camino, o altra fonte di calore. Voi siete il sensore NTC, e come lui percepirete una certa temperatura.<\/p>\n\n\n\n

Immaginate ora che sul lato opposto a voi nella stanza ci sia una finestra e che ad un certo punto venga aperta. Ovviamente siamo in inverno, fa freddo, ed \u00e8 inevitabile che l\u2019aria che entra vada a modificare la temperatura nella stanza. L\u2019influenza sar\u00e0 maggiore lontano dalla stufa e minore in prossimit\u00e0 di essa, ma ci sar\u00e0 e voi stessi lo percepirete, siete d\u2019accordo?<\/p>\n\n\n\n

Quindi \u00e8 giusto che la temperatura pi\u00f9 vicina al termistore abbia un impatto maggiore sulla lettura, ma la parte di bulbo rimasta fuori dal liquido ha ancora la sua influenza, e come una finestra aperta pu\u00f2 variare la lettura della temperatura, o il modo in cui essa viene percepita.<\/p>\n\n\n\n

In questo caso, una quota di tubo sensibile \u00e8 posizionata fuori dal nostro liquido, quindi la temperatura rilevata in questa parte \u00e8 la temperatura dell’aria. Ed \u00e8 per questo che la lettura della temperatura in un serbatoio mezzo pieno pu\u00f2 risultare non precisa, di conseguenza maggiore sar\u00e0 la quota di bulbo a contatto con l\u2019aria e meno accurata sar\u00e0 la lettura della temperatura.<\/p>\n\n\n\n

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

69-E-SE-IL-SERBATOIO-E-MEZZO-VUOTO<\/a>Download<\/a><\/div>\n\n\n\n
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Vi parlo oggi di una particolare applicazione delle sonde di temperatura NTC e di una criticit\u00e0 che \u00e8 importante prevedere fin dalla progettazione. Fra le numerose applicazioni delle sonde di temperatura, indipendentemente dal sensore utilizzato, vi\u00a0\u00e8 quella di rilevare la temperatura di un liquido contenuto…<\/p>\n","protected":false},"author":2,"featured_media":13908,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239,236],"tags":[177,276,275,278],"class_list":["post-13906","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-funzionamento-tecnico","category-prodotti","tag-ntc","tag-serbatoio","tag-sonde-di-temperatura","tag-tubo-sensibile"],"yoast_head":"\n#69 - E se il\u00a0serbatoio\u00a0\u00e8 mezzo vuoto? -<\/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\/2023\/02\/16\/69-e-se-il-serbatoio-e-mezzo-vuoto\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#69 - E se il\u00a0serbatoio\u00a0\u00e8 mezzo vuoto? -\" \/>\n<meta property=\"og:description\" content=\"Vi parlo oggi di una particolare applicazione delle sonde di temperatura NTC e di una criticit\u00e0 che \u00e8 importante prevedere fin dalla progettazione. 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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\/funzionamento-tecnico\/\" rel=\"category tag\">Funzionamento tecnico<\/a> <a href=\"https:\/\/rdcomponents.com\/site\/category\/prodotti\/\" rel=\"category tag\">Prodotti<\/a>","rttpg_excerpt":"Vi parlo oggi di una particolare applicazione delle sonde di temperatura NTC e di una criticit\u00e0 che \u00e8 importante prevedere fin dalla progettazione. Fra le numerose applicazioni delle sonde di temperatura, indipendentemente dal sensore utilizzato, vi\u00a0\u00e8 quella di rilevare la temperatura di un liquido contenuto...","_links":{"self":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/13906","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=13906"}],"version-history":[{"count":0,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/13906\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media\/13908"}],"wp:attachment":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media?parent=13906"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/categories?post=13906"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/tags?post=13906"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}