{"id":8234566,"date":"2026-10-24T17:28:05","date_gmt":"2026-10-24T17:28:05","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234566"},"modified":"2026-10-24T17:29:37","modified_gmt":"2026-10-24T17:29:37","slug":"pt100-eller-termoelement","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/da\/guider\/pt100-eller-termoelement\/","title":{"rendered":"PT100 eller termoelement? S\u00e5dan v\u00e6lger du temperaturf\u00f8ler"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>PT100 eller termoelement? S\u00e5dan v\u00e6lger du temperaturf\u00f8ler<\/h1>\n<p class=\"g-lead\">PT100 og termoelementer er de mest udbredte m\u00e5der at m\u00e5le temperatur p\u00e5 i industrien. Her gennemg\u00e5r vi, hvordan de virker, hvor n\u00f8jagtige de er, og hvordan du v\u00e6lger f\u00f8ler, tilslutning og dykr\u00f8r.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>PT100<\/b> \u2013 n\u00f8jagtig og stabil, typisk op til 600 \u00b0C. F\u00f8rstevalget i processer, f\u00f8devarer, varme og ventilation.<\/li>\n<li><b>Termoelement<\/b> \u2013 t\u00e5ler h\u00f8jere temperaturer, over 1 000 \u00b0C, og reagerer hurtigt. N\u00f8jagtigheden er lavere.<\/li>\n<li><b>N\u00f8jagtighed<\/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>Tilslutning<\/b> \u2013 tilslut PT100 med tre eller fire ledere. Ellers m\u00e5ler du ogs\u00e5 kablets modstand.<\/li>\n<li><b>Transmitter<\/b> \u2013 en transmitter oms\u00e6tter signalet til 4\u201320 mA eller IO-Link, som t\u00e5ler lange kabler.<\/li>\n<\/ul>\n<\/div>\n<h2>S\u00e5dan virker PT100 og termoelementer<\/h2>\n<p>En <b>PT100<\/b> er et modstandstermometer. En platinmodstand har 100 \u03a9 ved 0 \u00b0C, og modstanden stiger med cirka 0,39 \u03a9 pr. grad. Ved 100 \u00b0C er den 138,5 \u03a9. Instrumentet sender en lille str\u00f8m gennem modstanden og beregner temperaturen. PT1000 virker p\u00e5 samme m\u00e5de, men har 1 000 \u03a9 ved 0 \u00b0C. Egenskaberne er defineret i IEC 60751.<\/p>\n<p>Et <b>termoelement<\/b> best\u00e5r af to tr\u00e5de af forskellige metaller, der er svejst sammen i spidsen. N\u00e5r spidsen og den anden ende, referencepunktet, har forskellig temperatur, opst\u00e5r der en lille sp\u00e6nding \u2013 for type K cirka 41 \u00b5V pr. grad. Instrumentet m\u00e5ler temperaturen ved referencepunktet og regner den med, s\u00e5kaldt koldpunktskompensering. Typerne og deres tabeller findes i IEC 60584-1.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-temperatur-f1-da.webp\" alt=\"Princip: I en PT100 stiger platinmodstandens modstand med temperaturen. I et termoelement giver to forskellige metaller en sp\u00e6nding, der afh\u00e6nger af temperaturforskellen mellem m\u00e5lepunktet og referencepunktet.\" width=\"1520\" height=\"512\" loading=\"lazy\" decoding=\"async\"><figcaption>PT100 m\u00e5ler modstand, termoelementet m\u00e5ler en sp\u00e6nding, der afh\u00e6nger af temperaturforskellen.<\/figcaption><\/figure>\n<h2>PT100 eller termoelement \u2013 hvilken skal du v\u00e6lge?<\/h2>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Egenskab<\/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>Typisk \u2212200 til +600 \u00b0C<\/td>\n<td>Op til cirka 1 700 \u00b0C afh\u00e6ngigt af type<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">N\u00f8jagtighed<\/td>\n<td>H\u00f8j: 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>Meget god over tid<\/td>\n<td>Driver mere, is\u00e6r ved h\u00f8je temperaturer<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Reaktionstid<\/td>\n<td>L\u00e6ngere, elementet er st\u00f8rre<\/td>\n<td>Kort, spidsen kan v\u00e6re meget tynd<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Kabel<\/td>\n<td>Almindeligt kobberkabel med 3 eller 4 ledere<\/td>\n<td>Kompensationskabel af samme type<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Pris<\/td>\n<td>Lidt dyrere element<\/td>\n<td>Billigt element<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>En enkel tommelfingerregel: N\u00e5r n\u00f8jagtighed og stabilitet er vigtigst, og temperaturen ligger under nogle hundrede grader, s\u00e5 v\u00e6lg PT100. Over 600 \u00b0C, ved hurtige forl\u00f8b, eller n\u00e5r f\u00f8leren skal v\u00e6re meget lille, s\u00e5 v\u00e6lg termoelement.<\/p>\n<h2>N\u00f8jagtighedsklasser og termoelementtyper<\/h2>\n<p>IEC 60751 inddeler PT100 og PT1000 i toleranceklasser. Tolerancen g\u00e6lder selve elementet, ikke hele m\u00e5lek\u00e6den. Her er t temperaturen i \u00b0C:<\/p>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Klasse<\/th>\n<th>Tolerance<\/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 g\u00e6lder kun inden for et bestemt omr\u00e5de, som er sn\u00e6vrere for tyndfilmselementer end for tr\u00e5dviklede. Klasse A g\u00e6lder for eksempel fra \u221230 til +300 \u00b0C for tyndfilm og fra \u2212100 til +450 \u00b0C for tr\u00e5dviklede elementer. Betegnelsen 1\/3 DIN betyder en tredjedel af tolerancen i klasse B.<\/p>\n<h3>Almindelige termoelementtyper<\/h3>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Type<\/th>\n<th>Materiale<\/th>\n<th>Egnet til<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">K<\/td>\n<td>NiCr\u2013NiAl<\/td>\n<td>Allround-type op til cirka 1 200 \u00b0C: ovne, udst\u00f8dningsgas, varmebehandling<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">N<\/td>\n<td>NiCrSi\u2013NiSi<\/td>\n<td>Op til cirka 1 200 \u00b0C, mere stabil end K ved h\u00f8je temperaturer<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">J<\/td>\n<td>Fe\u2013CuNi<\/td>\n<td>Op til 750 \u00b0C, udbredt i plastmaskiner<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">T<\/td>\n<td>Cu\u2013CuNi<\/td>\n<td>Lave temperaturer, k\u00f8ling og f\u00f8devarer<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">R, S, B<\/td>\n<td>Platin\u2013rhodium<\/td>\n<td>Op til 1 600\u20131 700 \u00b0C: glas, st\u00e5l og keramik<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>2-leder, 3-leder eller 4-leder?<\/h2>\n<p>En PT100 m\u00e5ler modstand, s\u00e5 kablets modstand indg\u00e5r ogs\u00e5 i m\u00e5lev\u00e6rdien. Med 2-ledertilslutning og ti meter kabel med 0,5 mm\u00b2 ledere bliver fejlen n\u00e6sten 2 \u00b0C.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-temperatur-f2-da.webp\" alt=\"2-, 3- og 4-ledertilslutning af en PT100 til et instrument. Med flere ledere mindskes kablets indflydelse p\u00e5 m\u00e5lev\u00e6rdien.\" width=\"1520\" height=\"480\" loading=\"lazy\" decoding=\"async\"><figcaption>Jo flere ledere, desto mindre p\u00e5virker kablet m\u00e5lev\u00e6rdien.<\/figcaption><\/figure>\n<ul>\n<li><b>2-leder<\/b> \u2013 den enkleste. Kun til korte kabler eller PT1000.<\/li>\n<li><b>3-leder<\/b> \u2013 standard i industrien. Instrumentet m\u00e5ler \u00e9n leder og tr\u00e6kker den fra, s\u00e5 l\u00e6nge lederne er ens.<\/li>\n<li><b>4-leder<\/b> \u2013 to ledere til str\u00f8mmen og to til at m\u00e5le sp\u00e6ndingen. Kablet har ingen indflydelse. Til laboratorier og kalibrering.<\/li>\n<\/ul>\n<p>Termoelementer p\u00e5virkes ikke af kablets modstand p\u00e5 samme m\u00e5de. Til geng\u00e6ld skal kablet v\u00e6re af samme type som termoelementet hele vejen frem til instrumentet. En samling med almindeligt kobberkabel bliver et nyt m\u00e5lepunkt.<\/p>\n<h2>Reaktionstid, dykr\u00f8r og transmittere<\/h2>\n<p>Reaktionstiden angives ofte som t0,5 eller t0,9: tiden, indtil f\u00f8leren viser henholdsvis 50 og 90 % af et temperaturspring. Den afh\u00e6nger mere af dykr\u00f8ret og mediet end af elementet. Str\u00f8mmende v\u00e6ske giver kort reaktionstid, stillest\u00e5ende luft lang.<\/p>\n<p>Et <b>dykr\u00f8r<\/b> beskytter f\u00f8leren mod tryk, flow og slid og g\u00f8r det muligt at udskifte den uden at t\u00f8mme processen. Dykdybden skal v\u00e6re tilstr\u00e6kkelig. En udbredt tommelfingerregel er mindst ti gange r\u00f8rets diameter, ellers leder r\u00f8ret varme v\u00e6k, og f\u00f8leren viser forkert.<\/p>\n<p>En <b>temperaturtransmitter<\/b> i tilslutningshovedet eller p\u00e5 DIN-skinne oms\u00e6tter signalet til 4\u201320 mA, IO-Link eller feltbus. Alternativet er en analog indgang i PLC&#8217;en, der kan l\u00e6se PT100 og termoelementer direkte, eller et temperaturrel\u00e6, der giver alarm ved en gr\u00e6nsev\u00e6rdi.<\/p>\n<ol class=\"g-pit\">\n<li><b>Forkert kabel til termoelementet.<\/b> Samlinger med kobberkabel eller kompensationskabel af forkert type kan give fejl p\u00e5 flere grader.<\/li>\n<li><b>2-ledertilslutning p\u00e5 lange kabler.<\/b> Kablets modstand l\u00e6gges til m\u00e5lev\u00e6rdien. Brug tre eller fire ledere eller en transmitter t\u00e6t p\u00e5 f\u00f8leren.<\/li>\n<li><b>For lille dykdybde.<\/b> F\u00f8leren p\u00e5virkes af omgivelsernes temperatur via dykr\u00f8ret og viser forkert, is\u00e6r i r\u00f8r med lille diameter.<\/li>\n<li><b>Klassen g\u00e6lder kun elementet.<\/b> Transmitter og indgangskort har deres egne fejl. Regn p\u00e5 hele m\u00e5lek\u00e6den, og kalibr\u00e9r den som en helhed, n\u00e5r n\u00f8jagtigheden er vigtig.<\/li>\n<\/ol>\n<h2>Hvor bruges temperaturf\u00f8lere?<\/h2>\n<ul>\n<li><b>F\u00f8devarer og medicinalindustri<\/b> \u2013 PT100 i hygiejnisk udf\u00f8relse til pasteurisering, CIP-reng\u00f8ring og k\u00f8lerum.<\/li>\n<li><b>Fabrikker og maskiner<\/b> \u2013 olie- og k\u00f8levandstemperatur, lejer og motorviklinger.<\/li>\n<li><b>Energi<\/b> \u2013 fjernvarme, varmepumper, transformere og generatorer i vand- og vindkraft.<\/li>\n<li><b>Ovne og metal<\/b> \u2013 termoelementer type K, N eller S i h\u00e6rdeovne, st\u00f8berier og glasproduktion.<\/li>\n<li><b>K\u00f8ret\u00f8jer og mobile maskiner<\/b> \u2013 temperatur p\u00e5 udst\u00f8dningsgas, k\u00f8lev\u00e6ske og hydraulikolie.<\/li>\n<li><b>Laboratorier og medicoteknik<\/b> \u2013 PT100 med 4-ledertilslutning til n\u00f8jagtig m\u00e5ling og kalibrering.<\/li>\n<\/ul>\n<h2>Temperaturf\u00f8lere hos SCN<\/h2>\n<p>Vi har temperaturf\u00f8lere til v\u00e6sker og gasser i r\u00f8rsystemer fra Wenglor, temperaturrel\u00e6er fra Tele Haase og I\/O-moduler fra Yaskawa og Moxa, der l\u00e6ser PT100 og termoelementer direkte. Fort\u00e6l os om temperatur, medie og signal, s\u00e5 hj\u00e6lper vi dig med at v\u00e6lge.<\/p>\n<h3>Eksempler fra vores sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/fxtt001-da\/\"><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. Koblingsudgange eller analogt signal indstilles via IO-Link, IP68 og IP69K.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/g2tf-g2tmpt100-temperature-monitors-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/tele-haase-temp-main.webp\" alt=\"Tele Haase G2TF \/ G2TMPT100 temperaturrel\u00e6er\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Tele Haase<\/span><span class=\"g-pn\">G2TF \/ G2TMPT100 temperaturrel\u00e6er<\/span><span class=\"g-pw\">Temperaturrel\u00e6 p\u00e5 DIN-skinne, der overv\u00e5ger PT100 med flere gr\u00e6nsev\u00e6rdier eller op til seks PTC-f\u00f8lere i motorviklinger.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/m31-1cd50-da\/\"><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 indgange til Pt100 og Pt1000 i 2-, 3- eller 4-ledertilslutning og til termoelementer type J, K, N, T med flere.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/sensors-da\/temperature-sensors-da\/\">Temperaturf\u00f8lere<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/komponenter\/monitoring-relays-da\/\">Overv\u00e5gningsrel\u00e6er<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/control-systems-da\/plc-systems-da\/micro-plc-da\/\">Mikro-PLC<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/sensors-da\/sensorer-til-tilstandsovervagning-da\/\">Sensorer til tilstandsoverv\u00e5gning<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/sensors-da\/\">Sensorer<\/a><\/div>\n<div class=\"g-cta\">\n<p>Er du i tvivl om f\u00f8lertype, klasse eller tilslutning? Sp\u00f8rg en af vores ingeni\u00f8rer \u2013 du f\u00e5r svar inden for 24 timer.<\/p>\n<p><a href=\"https:\/\/scn.eu\/da\/kontakt\/\">Sp\u00f8rg en ingeni\u00f8r<\/a><\/div>\n<h2>Ofte stillede sp\u00f8rgsm\u00e5l<\/h2>\n<details>\n<summary>Hvad er forskellen p\u00e5 PT100 og PT1000?<\/summary>\n<p>Begge er platinmodstande efter IEC 60751, men PT1000 har 1 000 \u03a9 ved 0 \u00b0C. Kablets modstand betyder derfor mindre, og PT1000 fungerer bedre med 2-ledertilslutning. Instrumentet skal v\u00e6re indstillet til den rigtige type.<\/p>\n<\/details>\n<details>\n<summary>Hvordan kontrollerer jeg en PT100 med et multimeter?<\/summary>\n<p>M\u00e5l modstanden mellem lederne. Ved 0 \u00b0C skal den v\u00e6re 100 \u03a9 og ved 20 \u00b0C cirka 108 \u03a9. En meget h\u00f8j v\u00e6rdi tyder p\u00e5 afbrydelse, en v\u00e6rdi t\u00e6t p\u00e5 nul p\u00e5 kortslutning.<\/p>\n<\/details>\n<details>\n<summary>Hvilket termoelement skal jeg v\u00e6lge?<\/summary>\n<p>Type K er allround-valget op til cirka 1 200 \u00b0C. Type N er mere stabil ved h\u00f8je temperaturer, type T passer til lave temperaturer og type R, S og B til de allerh\u00f8jeste.<\/p>\n<\/details>\n<details>\n<summary>Hvad betyder 1\/3 DIN?<\/summary>\n<p>En PT100 med en tredjedel af tolerancen i klasse B, alts\u00e5 cirka \u00b1(0,1 + 0,0017\u00b7|t|) \u00b0C. Det svarer til klasse AA i IEC 60751.<\/p>\n<\/details>\n<details>\n<summary>Hvorfor viser mit termoelement forkert?<\/summary>\n<p>Typiske \u00e5rsager er forkert kompensationskabel, byttet polaritet, forkert termoelementtype indstillet i instrumentet eller en f\u00f8ler, der er \u00e6ldet af h\u00f8j temperatur.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>PT100 og termoelementer er de mest udbredte m\u00e5der at m\u00e5le temperatur p\u00e5 i industrien. Her gennemg\u00e5r vi, hvordan de virker, hvor n\u00f8jagtige de er, og hvordan du v\u00e6lger f\u00f8ler, tilslutning og dykr\u00f8r.<\/p>\n","protected":false},"author":11,"featured_media":8234450,"template":"","meta":{"_yoast_wpseo_focuskw":"pt100","_yoast_wpseo_metadesc":"PT100 eller termoelement? Sammenlign m\u00e5leomr\u00e5de, n\u00f8jagtighedsklasser efter IEC 60751, termoelementtyper, 2-, 3- og 4-ledertilslutning og reaktionstid.","_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-8234566","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? S\u00e5dan v\u00e6lger du temperaturf\u00f8ler | SCN<\/title>\n<meta name=\"description\" content=\"PT100 eller termoelement? 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