{"id":17352,"date":"2025-07-17T14:00:00","date_gmt":"2025-07-17T12:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=17352"},"modified":"2025-07-23T08:47:31","modified_gmt":"2025-07-23T06:47:31","slug":"181-controllo-tramite-la-lettura-della-resistenza","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2025\/07\/17\/181-controllo-tramite-la-lettura-della-resistenza\/","title":{"rendered":"#181 Controllo tramite la lettura della resistenza"},"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=\"wp-block-paragraph\" style=\"font-size:16px\">La nostra cavalcata nel mondo dei dispositivi per il controllo della temperatura continua. Passiamo dai componenti pi\u00f9 strettamente meccanici a quelli un po\u2019 pi\u00f9 sofisticati, che richiedono l\u2019impiego di una strumentazione elettronica capace di intervenire in funzione delle informazioni che vengono trasmesse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Passiamo ora dai\u00a0<strong>termostati<\/strong>, dai\u00a0<strong>protettori termici<\/strong>\u00a0e dai\u00a0<strong>termofusibili\u00a0<\/strong>ai\u00a0<strong>sensori di temperatura<\/strong>\u00a0che <a href=\"https:\/\/rdcomponents.com\/site\/2022\/03\/03\/25-sensori-di-temperatura\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>possiamo sintetizzare in\u00a05\u00a0principali famiglie<\/strong><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\"><a href=\"https:\/\/rdcomponents.com\/site\/ntc\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>NTC<\/strong><\/a> &#8211; <strong><a href=\"https:\/\/rdcomponents.com\/site\/2022\/02\/10\/22-termistori-ntc\/\" target=\"_blank\" rel=\"noreferrer noopener\">Negative Temperature Coefficient<\/a><\/strong>. Questi termistori (dalla contrazione di temperatura e resistore, dall\u2019inglese therm(ally sensitive res)istor, cio\u00e8 \u00ab<em>resistore termicamente sensibile<\/em>\u00bb) sono sensori che vengono realizzati tramite semiconduttori prodotti con\u00a0<em>ossidi di metallo drogati<\/em>.\u00a0Con l\u2018aumento della temperatura diminuisce la resistenza seguendo una costante nota come beta (<strong>\u03b2<\/strong>), misurato in gradi\u00a0<em>Kelvin<\/em>\u00a0indica l\u2019arco di temperatura in cui \u00e8 valida la tolleranza. Normalmente questo intervallo di tempo va da\u00a0<strong>25\u00b0C\u00a0<\/strong>a\u00a0<strong>85\u00b0C<\/strong>\u00a0e il valore di resistenza che il sensore avr\u00e0 in relazione alle due diverse temperature contribuir\u00e0 a determinare il valore finale di\u00a0<strong>Beta<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Un altro valore che \u00e8 fondamentale per identificare la curva di un&nbsp;<strong>NTC&nbsp;<\/strong>\u00e8 la \u201c<em><strong>Resistenza nominale<\/strong><\/em>\u201d. Vale a dire la resistenza (espressa in&nbsp;<strong>ohm \u03a9<\/strong>, quasi sempre nel nostro caso in&nbsp;<strong>K\u03a9<\/strong>) alla&nbsp;<strong>T0<\/strong>, che normalmente \u00e8 di&nbsp;<strong>25\u00b0C<\/strong>. La precisione nella lettura \u00e8 buona e il campo di applicazione arriva fino a&nbsp;<strong>300\u00b0C<\/strong>. \u00c8 molto diffuso nel settore della refrigerazione, e pi\u00f9 in generale della ristorazione, ma anche del riscaldamento. Individuati i parametri tecnici si potr\u00e0 prendere in considerazione l\u2019esecuzione della sonda che varier\u00e0 a seconda dell\u2019applicazione e del progetto.<\/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=\"1373\" src=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/NTC-scaled.jpg\" alt=\"resistenza\" class=\"wp-image-17353\" style=\"width:800px\" srcset=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/NTC-scaled.jpg 2560w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/NTC-300x161.jpg 300w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/NTC-1024x549.jpg 1024w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/NTC-150x80.jpg 150w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/NTC-768x412.jpg 768w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/NTC-1536x824.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=\"wp-block-paragraph\" style=\"font-size:16px\"><a href=\"https:\/\/rdcomponents.com\/site\/ptc\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PTC<\/strong><\/a> &#8211; <strong><a href=\"https:\/\/rdcomponents.com\/site\/2022\/01\/27\/20-termistori-ptc\/\">Positive Temperature Coefficient<\/a><\/strong>. Il&nbsp;termistore&nbsp;<strong>PTC<\/strong> \u00e8 un&nbsp;<strong>semiconduttore ceramico<\/strong>&nbsp;che aumenta la propria resistenza con l\u2019aumentare della temperatura. Inizialmente la variazione di resistenza \u00e8 minima e rimane costante fino alla temperatura di intervento. Raggiunto tale limite possiamo osservare una variazione della resistenza maggiore a&nbsp;<strong>1kOhm<\/strong>, che viene letta da uno strumento connesso al&nbsp;<strong>PTC&nbsp;<\/strong>(<em>sganciatore<\/em>) che apre il circuito in modo permanente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\"><a href=\"https:\/\/rdcomponents.com\/site\/ptc\/#kty84\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>KTY<\/strong><\/a> &#8211;<strong> <a href=\"https:\/\/rdcomponents.com\/site\/2022\/02\/03\/21-sensori-kty\/\">Silicon Resistive Sensor<\/a><\/strong>. Il nome&nbsp;<strong>KTY<\/strong> fu dato a questo tipo di&nbsp;sensore&nbsp;dalla&nbsp;<strong>PHILIPS<\/strong>, che fu la prima a produrlo. Si tratta di un semiconduttore in&nbsp;<em>silicio<\/em>, simile a un&nbsp;<em>diodo<\/em>, che copre un ampio campo di misurazione. Di conseguenza soddisfa la maggior parte dei requisiti industriali, soprattutto nel campo dei motori e motoriduttori. Inoltre, i&nbsp;sensori&nbsp;<strong>KTY&nbsp;<\/strong>hanno una curva&nbsp;<strong>RT<\/strong>,&nbsp;<em><strong>resistenza-temperatura<\/strong><\/em>, quasi lineare e questo li rende particolarmente adatti alla misurazione della temperatura e per il monitoraggio dei valori limite.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\"><a href=\"https:\/\/rdcomponents.com\/site\/sensori-pt\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>RTD<\/strong><\/a> &#8211; <strong><a href=\"https:\/\/rdcomponents.com\/site\/2022\/02\/17\/23-termoresistenze-rtd\/\" target=\"_blank\" rel=\"noreferrer noopener\">Resistance Temperature Detector<\/a><\/strong>. Sono sensori composti da un impasto di&nbsp;<em>ceramica&nbsp;<\/em>e&nbsp;<em>Platino<\/em>&nbsp;(<strong>Pt<\/strong>), il metallo risultato pi\u00f9 idoneo per questo tipo di sensore, poich\u00e9 la sua resistenza nominale ha un valore di&nbsp;<strong>100 Ohm a 0\u00b0C<\/strong>. Per questo motivo le&nbsp;termoresistenze&nbsp;<strong>RTD&nbsp;<\/strong>sono spesso conosciute come&nbsp;<strong>sensori Pt<\/strong>, ai quali viene convenzionalmente aggiunto il valore di resistenza a&nbsp;<strong>0\u00b0C<\/strong>. Si parler\u00e0 quindi di&nbsp;<strong>Pt100<\/strong>&nbsp;oppure&nbsp;<strong>Pt1000<\/strong>, che significa sensore Pt (<em>platino<\/em>)&nbsp;<strong>100 \u03a9<\/strong>&nbsp;(oppure&nbsp;<strong>1.000 \u03a9<\/strong>,&nbsp;<strong>500 \u03a9<\/strong>) a&nbsp;<strong>0\u00b0C<\/strong>. &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Come gli altri tipi di sensore, anche gli&nbsp;<strong>RTD&nbsp;<\/strong>consentono di rilevare la temperatura sulla base della lettura della resistenza. Questa, infatti, cresce in modo costante e la sua rappresentazione grafica della&nbsp;<strong>RT&nbsp;<\/strong>(<em><strong>resistenza vs temperatura<\/strong><\/em>) \u00e8 una linea retta che rende pi\u00f9 facile e precisa la rilevazione della temperatura in un range che va da&nbsp;<strong>-200\u00b0C<\/strong>&nbsp;a&nbsp;<strong>850\u00b0C<\/strong>. Anche in questo caso stiamo parlando di un sensore per rilevare la temperatura. Trova largo impiego nel mondo dei motori lineari, dei riduttori, nei trasformatori, e pi\u00f9 in generale ovunque serva rilevare la temperatura con precisione.<\/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=\"2393\" height=\"1393\" src=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/PTC-KTY-RTD-per-ARTICOLO.jpg\" alt=\"resistenza\" class=\"wp-image-17361\" style=\"width:800px\" srcset=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/PTC-KTY-RTD-per-ARTICOLO.jpg 2393w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/PTC-KTY-RTD-per-ARTICOLO-300x175.jpg 300w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/PTC-KTY-RTD-per-ARTICOLO-1024x596.jpg 1024w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/PTC-KTY-RTD-per-ARTICOLO-150x87.jpg 150w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/PTC-KTY-RTD-per-ARTICOLO-768x447.jpg 768w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/PTC-KTY-RTD-per-ARTICOLO-1536x894.jpg 1536w\" sizes=\"auto, (max-width: 2393px) 100vw, 2393px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\"><a href=\"https:\/\/rdcomponents.com\/site\/termocoppie\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>TERMOCOPPIE<\/strong><\/a><strong>:<\/strong> <a href=\"https:\/\/rdcomponents.com\/site\/2022\/02\/24\/24-termocoppie\/\"><strong>Questo tipo di sonda<\/strong><\/a> \u00e8 costituito da due metalli diversi uniti alle due estremit\u00e0. Quando una delle due estremit\u00e0 viene esposta a una temperatura diversa dall\u2019altra, quest\u2019ultima andr\u00e0 a generare una tensione elettrica proporzionale alla differenza di temperatura. Ci\u00f2 consentir\u00e0 la lettura della temperatura. Non hanno la precisione degli NTC, n\u00e9 tantomeno dei PT ma, a seconda dei materiali utilizzati abbiamo diversi tipi di termocoppie con prestazioni e temperature diverse. Le pi\u00f9 comuni sono:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\"><strong>K \u2013 Nichel<\/strong>&nbsp;(Cromel\/Alumel)&nbsp;<strong>-200\u00b0C<\/strong>&nbsp;\/&nbsp;<strong>+1.260\u00b0C<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\"><strong>J \u2013 Ferro<\/strong>\/Costantana&nbsp;<strong>-40\u00b0C<\/strong>&nbsp;\/&nbsp;<strong>+750\u00b0C<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\"><strong>N \u2013 Nicrosil-Nisil<\/strong>&nbsp;(Nichel\/Cromo\/Silicio)&nbsp;<strong>-270\u00b0C<\/strong>&nbsp;\/&nbsp;<strong>+1.300\u00b0C<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\"><strong>T \u2013 Lega Costantana<\/strong>&nbsp;(Rame\/Nichel)&nbsp;<strong>-200\u00b0C<\/strong>&nbsp;\/&nbsp;<strong>+350\u00b0C<\/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=\"2320\" height=\"2007\" src=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/Termocoppie.jpg\" alt=\"resistenza\" class=\"wp-image-17359\" style=\"width:800px\" srcset=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/Termocoppie.jpg 2320w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/Termocoppie-300x260.jpg 300w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/Termocoppie-1024x886.jpg 1024w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/Termocoppie-116x100.jpg 116w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/Termocoppie-768x664.jpg 768w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/07\/Termocoppie-1536x1329.jpg 1536w\" sizes=\"auto, (max-width: 2320px) 100vw, 2320px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">A seconda dell\u2019applicazione e del tipo di funzione che viene chiesta alla nostra sonda avremo un determinato sensore per una lettura mirata della temperatura. La scelta \u00e8 vasta e le esecuzioni sono infinite.&nbsp;<strong>R&amp;D Components<\/strong>&nbsp;e tutti i suoi partner sono a disposizione per aiutarvi a trovare il giusto prodotto nell\u2019esecuzione pi\u00f9 adatta alle vostre esigenze.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La nostra cavalcata nel mondo dei dispositivi per il controllo della temperatura continua. Passiamo dai componenti pi\u00f9 strettamente meccanici a quelli un po\u2019 pi\u00f9 sofisticati, che richiedono l\u2019impiego di una strumentazione elettronica capace di intervenire in funzione delle informazioni che vengono trasmesse. Passiamo ora dai\u00a0termostati,&#8230;<\/p>\n","protected":false},"author":2,"featured_media":17353,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239,236],"tags":[176,177,189,166,178,190],"class_list":["post-17352","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-funzionamento-tecnico","category-prodotti","tag-kty","tag-ntc","tag-pt","tag-resistenza","tag-rtd","tag-termocoppie"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>#181 Controllo tramite la lettura della resistenza -<\/title>\n<meta name=\"description\" content=\"Dopo aver parlato dei termostati, dei protettori e dei termofusibili, approfondiamo oggi i sensori di temperatura\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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Passiamo dai componenti pi\u00f9 strettamente meccanici a quelli un po\u2019 pi\u00f9 sofisticati, che richiedono l\u2019impiego di una strumentazione elettronica capace di intervenire in funzione delle informazioni che vengono trasmesse. 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