{"id":8234586,"date":"2026-10-24T17:28:05","date_gmt":"2026-10-24T17:28:05","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234586"},"modified":"2026-10-24T17:30:40","modified_gmt":"2026-10-24T17:30:40","slug":"pt100-eller-termoelement","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/no\/guider\/pt100-eller-termoelement\/","title":{"rendered":"PT100 eller termoelement? Slik velger du temperaturf\u00f8ler"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>PT100 eller termoelement? Slik velger du temperaturf\u00f8ler<\/h1>\n<p class=\"g-lead\">PT100 og termoelementer er de vanligste m\u00e5tene \u00e5 m\u00e5le temperatur p\u00e5 i industrien. Her g\u00e5r vi gjennom hvordan de fungerer, hvor n\u00f8yaktige de er, og hvordan du velger f\u00f8ler, tilkobling og beskyttelsesr\u00f8r.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>PT100<\/b> \u2013 n\u00f8yaktig og stabil, vanligvis opp til 600 \u00b0C. F\u00f8rstevalget i prosessanlegg, n\u00e6ringsmiddelindustri og VVS.<\/li>\n<li><b>Termoelement<\/b> \u2013 t\u00e5ler h\u00f8yere temperaturer, over 1 000 \u00b0C, og reagerer raskt. N\u00f8yaktigheten er lavere.<\/li>\n<li><b>N\u00f8yaktighet<\/b> \u2013 en PT100 i klasse A har \u00b10,35 \u00b0C ved 100 \u00b0C. Et termoelement type K i klasse 1 har \u00b11,5 \u00b0C.<\/li>\n<li><b>Tilkobling<\/b> \u2013 koble PT100 med tre eller fire ledere. Ellers m\u00e5ler du ogs\u00e5 kabelens motstand.<\/li>\n<li><b>Transmitter<\/b> \u2013 en transmitter gj\u00f8r om signalet til 4\u201320 mA eller IO-Link, som t\u00e5ler lange kabler.<\/li>\n<\/ul>\n<\/div>\n<h2>Slik fungerer PT100 og termoelementer<\/h2>\n<p>En <b>PT100<\/b> er et motstandstermometer. En platinamotstand har 100 \u03a9 ved 0 \u00b0C, og motstanden \u00f8ker med omtrent 0,39 \u03a9 per grad. Ved 100 \u00b0C er den 138,5 \u03a9. Instrumentet sender en liten str\u00f8m gjennom motstanden og regner ut temperaturen. PT1000 fungerer p\u00e5 samme m\u00e5te, men har 1 000 \u03a9 ved 0 \u00b0C. Egenskapene er definert i IEC 60751.<\/p>\n<p>Et <b>termoelement<\/b> best\u00e5r av to tr\u00e5der av ulike metaller som er sveiset sammen i spissen. N\u00e5r spissen og den andre enden, referansepunktet, har ulik temperatur, oppst\u00e5r det en liten spenning \u2013 for type K omtrent 41 \u00b5V per grad. Instrumentet m\u00e5ler temperaturen i referansepunktet og tar hensyn til den, s\u00e5kalt kaldpunktkompensering. Typene og tabellene deres finnes i IEC 60584-1.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-temperatur-f1-no.webp\" alt=\"Prinsipp: I en PT100 \u00f8ker platinamotstandens resistans med temperaturen. I et termoelement gir to ulike metaller en spenning som avhenger av temperaturforskjellen mellom m\u00e5lepunktet og referansepunktet.\" width=\"1520\" height=\"512\" loading=\"lazy\" decoding=\"async\"><figcaption>PT100 m\u00e5ler motstand, termoelementet m\u00e5ler en spenning som avhenger av temperaturforskjellen.<\/figcaption><\/figure>\n<h2>PT100 eller termoelement \u2013 hva b\u00f8r du velge?<\/h2>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Egenskap<\/th>\n<th>PT100<\/th>\n<th>Termoelement<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">Temperatur<\/td>\n<td>Vanligvis \u2212200 til +600 \u00b0C<\/td>\n<td>Opp til ca. 1 700 \u00b0C avhengig av type<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">N\u00f8yaktighet<\/td>\n<td>H\u00f8y: klasse A \u00b10,35 \u00b0C ved 100 \u00b0C<\/td>\n<td>Lavere: type K klasse 1 \u00b11,5 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Stabilitet<\/td>\n<td>Sv\u00e6rt god over tid<\/td>\n<td>Drifter mer, s\u00e6rlig ved h\u00f8ye temperaturer<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Responstid<\/td>\n<td>Lengre, elementet er st\u00f8rre<\/td>\n<td>Kort, spissen kan v\u00e6re sv\u00e6rt tynn<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Kabel<\/td>\n<td>Vanlig kobberkabel med 3 eller 4 ledere<\/td>\n<td>Kompensasjonskabel av samme type<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Pris<\/td>\n<td>Noe dyrere element<\/td>\n<td>Billig element<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>En enkel tommelfingerregel: N\u00e5r n\u00f8yaktighet og stabilitet er viktigst og temperaturen ligger under noen hundre grader, velger du PT100. Over 600 \u00b0C, ved raske forl\u00f8p eller n\u00e5r f\u00f8leren m\u00e5 v\u00e6re sv\u00e6rt liten, velger du termoelement.<\/p>\n<h2>N\u00f8yaktighetsklasser og termoelementtyper<\/h2>\n<p>IEC 60751 deler PT100 og PT1000 inn i toleranseklasser. Toleransen gjelder selve elementet, ikke hele m\u00e5lekjeden. Her er t temperaturen i \u00b0C:<\/p>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Klasse<\/th>\n<th>Toleranse<\/th>\n<th>Ved 100 \u00b0C<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">AA<\/td>\n<td>\u00b1(0,1 + 0,0017\u00b7|t|) \u00b0C<\/td>\n<td>\u00b10,27 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">A<\/td>\n<td>\u00b1(0,15 + 0,002\u00b7|t|) \u00b0C<\/td>\n<td>\u00b10,35 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">B<\/td>\n<td>\u00b1(0,3 + 0,005\u00b7|t|) \u00b0C<\/td>\n<td>\u00b10,8 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">C<\/td>\n<td>\u00b1(0,6 + 0,01\u00b7|t|) \u00b0C<\/td>\n<td>\u00b11,6 \u00b0C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Klassen gjelder bare innenfor et bestemt omr\u00e5de, som er smalere for tynnfilmelementer enn for tr\u00e5dviklede. Klasse A gjelder for eksempel fra \u221230 til +300 \u00b0C for tynnfilm og fra \u2212100 til +450 \u00b0C for tr\u00e5dviklede elementer. Betegnelsen 1\/3 DIN betyr en tredjedel av toleransen i klasse B.<\/p>\n<h3>Vanlige termoelementtyper<\/h3>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Type<\/th>\n<th>Materiale<\/th>\n<th>Egnet for<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">K<\/td>\n<td>NiCr\u2013NiAl<\/td>\n<td>Allroundtype opp til ca. 1 200 \u00b0C: ovner, eksos, varmebehandling<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">N<\/td>\n<td>NiCrSi\u2013NiSi<\/td>\n<td>Opp til ca. 1 200 \u00b0C, mer stabil enn K ved h\u00f8ye temperaturer<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">J<\/td>\n<td>Fe\u2013CuNi<\/td>\n<td>Opp til 750 \u00b0C, vanlig i plastmaskiner<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">T<\/td>\n<td>Cu\u2013CuNi<\/td>\n<td>Lave temperaturer, kj\u00f8ling og n\u00e6ringsmidler<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">R, S, B<\/td>\n<td>Platina\u2013rhodium<\/td>\n<td>Opp til 1 600\u20131 700 \u00b0C: glass, st\u00e5l og keramikk<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>To-, tre- eller firelederkobling?<\/h2>\n<p>En PT100 m\u00e5ler motstand, s\u00e5 ogs\u00e5 kabelens motstand havner i m\u00e5leverdien. Med tolederkobling og ti meter kabel med 0,5 mm\u00b2 ledere blir feilen nesten 2 \u00b0C.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-temperatur-f2-no.webp\" alt=\"To-, tre- og firelederkobling av en PT100 til et instrument. Med flere ledere blir kabelens innvirkning p\u00e5 m\u00e5leverdien mindre.\" width=\"1520\" height=\"480\" loading=\"lazy\" decoding=\"async\"><figcaption>Jo flere ledere, desto mindre p\u00e5virker kabelen m\u00e5leverdien.<\/figcaption><\/figure>\n<ul>\n<li><b>Toleder<\/b> \u2013 enklest. Bare for korte kabler eller PT1000.<\/li>\n<li><b>Treleder<\/b> \u2013 standard i industrien. Instrumentet m\u00e5ler \u00e9n leder og trekker den fra, s\u00e5 lenge lederne er like.<\/li>\n<li><b>Fireleder<\/b> \u2013 to ledere for str\u00f8mmen, to for \u00e5 m\u00e5le spenningen. Kabelen p\u00e5virker ikke m\u00e5lingen. For laboratorier og kalibrering.<\/li>\n<\/ul>\n<p>Termoelementer p\u00e5virkes ikke av kabelens motstand p\u00e5 samme m\u00e5te. Til gjengjeld m\u00e5 kabelen v\u00e6re av samme type som termoelementet hele veien fram til instrumentet. En skj\u00f8t med vanlig kobberkabel blir et nytt m\u00e5lepunkt.<\/p>\n<h2>Responstid, beskyttelsesr\u00f8r og transmittere<\/h2>\n<p>Responstiden oppgis ofte som t0,5 eller t0,9: tiden til f\u00f8leren viser henholdsvis 50 og 90 % av et temperatursprang. Den avhenger mer av beskyttelsesr\u00f8ret og mediet enn av elementet. Str\u00f8mmende v\u00e6ske gir kort responstid, stillest\u00e5ende luft lang.<\/p>\n<p>Et <b>beskyttelsesr\u00f8r (termolomme)<\/b> beskytter f\u00f8leren mot trykk, str\u00f8mning og slitasje og gj\u00f8r at den kan byttes uten at prosessen m\u00e5 t\u00f8mmes. Innstikkdybden m\u00e5 v\u00e6re stor nok. En vanlig tommelfingerregel er minst ti ganger r\u00f8rets diameter, ellers leder r\u00f8ret bort varme og f\u00f8leren viser feil.<\/p>\n<p>En <b>temperaturtransmitter<\/b> i koblingshodet eller p\u00e5 DIN-skinne gj\u00f8r om signalet til 4\u201320 mA, IO-Link eller feltbuss. Alternativet er en analog inngang i PLS-en som h\u00e5ndterer PT100 og termoelementer direkte, eller et temperaturrel\u00e9 som gir alarm ved en grense.<\/p>\n<ol class=\"g-pit\">\n<li><b>Feil kabel til termoelementet.<\/b> Skj\u00f8ter med kobberkabel eller kompensasjonskabel av feil type kan gi feil p\u00e5 flere grader.<\/li>\n<li><b>Tolederkobling p\u00e5 lange kabler.<\/b> Kabelens motstand legges til m\u00e5leverdien. Bruk tre eller fire ledere, eller en transmitter n\u00e6r f\u00f8leren.<\/li>\n<li><b>For liten innstikkdybde.<\/b> F\u00f8leren merker omgivelsestemperaturen via beskyttelsesr\u00f8ret og viser feil, s\u00e6rlig i r\u00f8r med liten diameter.<\/li>\n<li><b>Klassen gjelder bare elementet.<\/b> Transmitter og inngangskort har egne feil. Regn p\u00e5 hele m\u00e5lekjeden, og kalibrer den som en helhet n\u00e5r n\u00f8yaktigheten er viktig.<\/li>\n<\/ol>\n<h2>Hvor brukes temperaturf\u00f8lere?<\/h2>\n<ul>\n<li><b>N\u00e6ringsmidler og legemidler<\/b> \u2013 PT100 i hygienisk utf\u00f8relse for pasteurisering, CIP-rengj\u00f8ring og kj\u00f8lerom.<\/li>\n<li><b>Fabrikk og maskiner<\/b> \u2013 olje- og kj\u00f8levannstemperatur, lagre og motorviklinger.<\/li>\n<li><b>Energi<\/b> \u2013 fjernvarme, varmepumper, transformatorer og generatorer i vann- og vindkraft.<\/li>\n<li><b>Ovner og metall<\/b> \u2013 termoelementer type K, N eller S i herdeovner, st\u00f8perier og glassproduksjon.<\/li>\n<li><b>Kj\u00f8ret\u00f8y og mobile maskiner<\/b> \u2013 temperatur i eksos, kj\u00f8lev\u00e6ske og hydraulikkolje.<\/li>\n<li><b>Laboratorier og medisinsk teknikk<\/b> \u2013 firelederkoblede PT100 for n\u00f8yaktig m\u00e5ling og kalibrering.<\/li>\n<\/ul>\n<h2>Temperaturf\u00f8lere hos SCN<\/h2>\n<p>Vi har temperaturf\u00f8lere for v\u00e6sker og gasser i r\u00f8rsystemer fra Wenglor, temperaturreleer fra Tele Haase og I\/O-moduler fra Yaskawa og Moxa som leser PT100 og termoelementer direkte. Fortell oss om temperatur, medium og signal, s\u00e5 hjelper vi deg med \u00e5 velge.<\/p>\n<h3>Eksempler fra sortimentet v\u00e5rt<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/no\/produkt\/fxtt001-no\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/FXTT001.jpg\" alt=\"Wenglor FXTT001 temperatursensor\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Wenglor<\/span><span class=\"g-pn\">FXTT001 temperatursensor<\/span><span class=\"g-pw\">M\u00e5ler v\u00e6sker og gasser i lukkede r\u00f8rsystemer. Bryterutganger eller analogt signal stilles inn via IO-Link, IP68 og IP69K.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/no\/produkt\/g2tf-g2tmpt100-temperature-monitors-no\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/tele-haase-temp-main.webp\" alt=\"Tele Haase G2TF \/ G2TMPT100 temperaturvakter\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Tele Haase<\/span><span class=\"g-pn\">G2TF \/ G2TMPT100 temperaturvakter<\/span><span class=\"g-pw\">Temperaturvakt p\u00e5 DIN-skinne som overv\u00e5ker PT100 med flere grenseverdier, eller opptil seks PTC-f\u00f8lere i motorviklinger.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/no\/produkt\/m31-1cd50-no\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/VIPA_M31-1CD50_3D.jpg\" alt=\"Yaskawa M31-1CD50\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Yaskawa<\/span><span class=\"g-pn\">M31-1CD50<\/span><span class=\"g-pw\">Fire analoge innganger for Pt100 og Pt1000 i to-, tre- eller firelederkobling og for termoelementer type J, K, N, T med flere.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/no\/produktkategori\/products-no\/sensors-no\/temperature-sensors-no\/\">Temperaturf\u00f8lere<\/a><a href=\"https:\/\/scn.eu\/no\/produktkategori\/products-no\/components-no\/monitoring-relays-no\/\">Overv\u00e5kingsreleer<\/a><a href=\"https:\/\/scn.eu\/no\/produktkategori\/products-no\/control-systems-no\/plc-systems-no\/micro-plc-no\/\">Mikro-PLS<\/a><a href=\"https:\/\/scn.eu\/no\/produktkategori\/products-no\/sensors-no\/sensorer-for-tilstandsovervaking-no\/\">Sensorer for tilstandsoverv\u00e5king<\/a><a href=\"https:\/\/scn.eu\/no\/produktkategori\/products-no\/sensors-no\/\">Sensorer<\/a><\/div>\n<div class=\"g-cta\">\n<p>Usikker p\u00e5 f\u00f8lertype, klasse eller tilkobling? Sp\u00f8r en av ingeni\u00f8rene v\u00e5re \u2013 du f\u00e5r svar innen 24 timer.<\/p>\n<p><a href=\"https:\/\/scn.eu\/no\/kontakt\/\">Sp\u00f8r en ingeni\u00f8r<\/a><\/div>\n<h2>Vanlige sp\u00f8rsm\u00e5l<\/h2>\n<details>\n<summary>Hva er forskjellen p\u00e5 PT100 og PT1000?<\/summary>\n<p>Begge er platinamotstander etter IEC 60751, men PT1000 har 1 000 \u03a9 ved 0 \u00b0C. Kabelens motstand betyr derfor mindre, og PT1000 fungerer bedre med tolederkobling. Instrumentet m\u00e5 v\u00e6re stilt inn p\u00e5 riktig type.<\/p>\n<\/details>\n<details>\n<summary>Hvordan sjekker jeg en PT100 med et multimeter?<\/summary>\n<p>M\u00e5l motstanden mellom lederne. Ved 0 \u00b0C skal den v\u00e6re 100 \u03a9 og ved 20 \u00b0C omtrent 108 \u03a9. En sv\u00e6rt h\u00f8y verdi tyder p\u00e5 brudd, en verdi n\u00e6r null p\u00e5 kortslutning.<\/p>\n<\/details>\n<details>\n<summary>Hvilket termoelement b\u00f8r jeg velge?<\/summary>\n<p>Type K er allroundvalget opp til ca. 1 200 \u00b0C. Type N er mer stabil ved h\u00f8ye temperaturer, type T passer for lave temperaturer og type R, S og B for de aller h\u00f8yeste.<\/p>\n<\/details>\n<details>\n<summary>Hva betyr 1\/3 DIN?<\/summary>\n<p>En PT100 med en tredjedel av toleransen i klasse B, alts\u00e5 omtrent \u00b1(0,1 + 0,0017\u00b7|t|) \u00b0C. Det tilsvarer klasse AA i IEC 60751.<\/p>\n<\/details>\n<details>\n<summary>Hvorfor viser termoelementet mitt feil?<\/summary>\n<p>Vanlige \u00e5rsaker er feil kompensasjonskabel, byttet polaritet, feil termoelementtype innstilt i instrumentet eller en f\u00f8ler som er eldet av h\u00f8y temperatur.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>PT100 og termoelementer er de vanligste m\u00e5tene \u00e5 m\u00e5le temperatur p\u00e5 i industrien. Her g\u00e5r vi gjennom hvordan de fungerer, hvor n\u00f8yaktige de er, og hvordan du velger f\u00f8ler, tilkobling og beskyttelsesr\u00f8r.<\/p>\n","protected":false},"author":11,"featured_media":8234457,"template":"","meta":{"_yoast_wpseo_focuskw":"pt100","_yoast_wpseo_metadesc":"PT100 eller termoelement? Sammenlign m\u00e5leomr\u00e5de, n\u00f8yaktighetsklasser etter IEC 60751, termoelementtyper, to-, tre- og firelederkobling og responstid.","_kad_post_transparent":"","_kad_post_title":"hide","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"hide","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","_scn_guide_cats":[12197],"_scn_guide_sectors":[1011,1080],"_scn_guide_type":"tech","_scn_guide_order":32,"footnotes":""},"class_list":["post-8234586","scn_guide","type-scn_guide","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PT100 eller termoelement? Slik velger du temperaturf\u00f8ler | SCN<\/title>\n<meta name=\"description\" content=\"PT100 eller termoelement? 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