{"id":8234567,"date":"2026-10-24T17:28:22","date_gmt":"2026-10-24T17:28:22","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234567"},"modified":"2026-10-24T17:29:38","modified_gmt":"2026-10-24T17:29:38","slug":"vejeceller","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/da\/guider\/vejeceller\/","title":{"rendered":"Vejeceller \u2013 typer, n\u00f8jagtighedsklasser og installation"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Vejeceller \u2013 typer, n\u00f8jagtighedsklasser og installation<\/h1>\n<p class=\"g-lead\">En vejecelle oms\u00e6tter kraft eller v\u00e6gt til et elektrisk signal og er hjertet i enhver industriel v\u00e6gt. Her gennemg\u00e5r vi, hvordan den virker, hvilke typer der findes, hvad C3 betyder, og hvordan du monterer den, s\u00e5 v\u00e6gten vejer rigtigt.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>Princip<\/b> \u2013 strain gauges i en Wheatstone-bro giver nogle f\u00e5 millivolt pr. volt forsyning, ofte 2 mV\/V.<\/li>\n<li><b>Type<\/b> \u2013 single point til platformsv\u00e6gte, b\u00f8jebj\u00e6lke og shear beam til gulvv\u00e6gte og tanke, S-type til tr\u00e6k og s\u00f8jle til store laster.<\/li>\n<li><b>Klasse<\/b> \u2013 C3 betyder klasse C efter OIML R60 med 3 000 verifikationsintervaller. Det er nok til de fleste industriv\u00e6gte.<\/li>\n<li><b>Elektronik<\/b> \u2013 en vejetransmitter eller v\u00e6gtindikator oms\u00e6tter signalet til 4\u201320 mA, 0\u201310 V eller feltbus.<\/li>\n<li><b>Montage<\/b> \u2013 sidekr\u00e6fter, st\u00f8d, svejsestr\u00f8m og stive r\u00f8r giver oftere fejl end selve vejecellen.<\/li>\n<\/ul>\n<\/div>\n<h2>S\u00e5dan virker en vejecelle<\/h2>\n<p>En vejecelle er et metallegeme, som regel af st\u00e5l eller aluminium, der b\u00f8jer sig ganske lidt, n\u00e5r det belastes. P\u00e5 legemet sidder strain gauges (str\u00e6km\u00e5lere): tynde metalfolier, hvis modstand \u00e6ndrer sig, n\u00e5r de str\u00e6kkes eller trykkes sammen. Fire strain gauges er forbundet i en <b>Wheatstone-bro<\/b>. To str\u00e6kkes og to trykkes sammen, s\u00e5 signalet bliver s\u00e5 stort som muligt, mens temperatureffekterne oph\u00e6ver hinanden.<\/p>\n<p>Broen forsynes med en sp\u00e6nding, ofte 5 eller 10 V. Udgangssignalet angives i <b>mV\/V<\/b> ved fuld last. En vejecelle med 2 mV\/V og 10 V forsyning giver alts\u00e5 20 mV ved nominel last. Signalet er svagt og forst\u00e6rkes i en v\u00e6gtindikator eller transmitter med h\u00f8j opl\u00f8sning.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-lastcell-f1-da.webp\" alt=\"Wheatstone-bro med fire strain gauges. N\u00e5r bj\u00e6lken belastes, str\u00e6kkes to strain gauges, og to trykkes sammen. Med 2 mV\/V og 10 V forsyning bliver signalet 20 mV ved fuld last.\" width=\"1520\" height=\"604\" loading=\"lazy\" decoding=\"async\"><figcaption>Fire strain gauges i en Wheatstone-bro giver et signal i millivolt pr. volt forsyning.<\/figcaption><\/figure>\n<p>Kablet har fire eller seks ledere. Med seks ledere m\u00e5ler elektronikken forsyningssp\u00e6ndingen direkte ved vejecellen, s\u00e5 sp\u00e6ndingsfaldet i kablet ikke har indflydelse. Et 4-lederkabel indg\u00e5r i cellens kalibrering og m\u00e5 ikke afkortes.<\/p>\n<h2>Hvilken type vejecelle har du brug for?<\/h2>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-lastcell-f2-da.webp\" alt=\"Fem typer vejeceller: single point, b\u00f8jebj\u00e6lke, shear beam, S-type og s\u00f8jle, med pile, der viser, hvordan kraften angriber.\" width=\"1520\" height=\"452\" loading=\"lazy\" decoding=\"async\"><figcaption>Vejecellens form bestemmer, hvordan den skal belastes, og hvilke v\u00e6gte den passer til.<\/figcaption><\/figure>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Type<\/th>\n<th>Typisk anvendelse<\/th>\n<th>Kendetegn<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">Single point<\/td>\n<td>Platformsv\u00e6gte, bordv\u00e6gte, pakkemaskiner<\/td>\n<td>\u00c9n celle under platformen. Kompenseret for last, der ikke st\u00e5r i midten.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">B\u00f8jebj\u00e6lke<\/td>\n<td>Sm\u00e5 v\u00e6gte og doseringsv\u00e6gte<\/td>\n<td>Enkel og prisvenlig ved lave laster.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Shear beam<\/td>\n<td>Gulvv\u00e6gte, pallev\u00e6gte, tanke og siloer<\/td>\n<td>M\u00e5ler forskydning og er mindre f\u00f8lsom over for, hvor lasten angriber. Udbredt op til flere ti tons.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">S-type<\/td>\n<td>H\u00e6ngende v\u00e6gte, tr\u00e6kpr\u00f8vning, l\u00f8ft<\/td>\n<td>M\u00e5ler tr\u00e6k og tryk i linje.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">S\u00f8jle<\/td>\n<td>Brov\u00e6gte, store siloer og tanke<\/td>\n<td>Til meget store laster, op til flere hundrede tons.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Der findes ogs\u00e5 specialceller, for eksempel wirevejeceller, der monteres direkte p\u00e5 en wire og fungerer som overlastsikring p\u00e5 l\u00f8fteudstyr.<\/p>\n<h2>N\u00f8jagtighedsklasser \u2013 hvad betyder C3?<\/h2>\n<p>Vejeceller til v\u00e6gte, der bruges i handel, klassificeres efter <b>OIML R60<\/b>. Bogstavet angiver n\u00f8jagtighedsklassen og tallet, hvor mange verifikationsintervaller i tusinder cellen klarer. C3 betyder klasse C med 3 000 intervaller, C6 klasse C med 6 000.<\/p>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Klasse<\/th>\n<th>Antal intervaller<\/th>\n<th>Typisk anvendelse<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">A<\/td>\n<td>50 000 og flere<\/td>\n<td>Pr\u00e6cisionsvejning i laboratorier<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">B<\/td>\n<td>5 000\u2013100 000<\/td>\n<td>Pr\u00e6cisionsv\u00e6gte<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">C<\/td>\n<td>500\u201310 000<\/td>\n<td>Industri- og handelsv\u00e6gte<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">D<\/td>\n<td>100\u20131 000<\/td>\n<td>Enkle v\u00e6gte<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Selve v\u00e6gten klassificeres efter <b>OIML R76<\/b>, hvor klasse III er den mest udbredte i industri og handel. Vejecellernes intervaller skal r\u00e6kke til v\u00e6gtens antal delinger. En v\u00e6gt til 3 000 kg med 1 kg deling kr\u00e6ver vejeceller, der klarer mindst 3 000 intervaller, for eksempel C3. Automatiske p\u00e5fyldningsv\u00e6gte er omfattet af OIML R61.<\/p>\n<p>Sammenlign ogs\u00e5 den kombinerede fejl (linearitet og hysterese), krybning under konstant last og hvordan temperaturen p\u00e5virker nulpunkt og f\u00f8lsomhed.<\/p>\n<h2>Fra vejecelle til styresystem<\/h2>\n<ul>\n<li><b>Analog vejetransmitter<\/b> \u2013 oms\u00e6tter signalet til 4\u201320 mA eller 0\u201310 V til PLC&#8217;ens analoge indgang. Enkelt, men indgangskortet begr\u00e6nser opl\u00f8sningen.<\/li>\n<li><b>Digital vejetransmitter<\/b> \u2013 sender v\u00e6gten via Modbus, PROFINET, EtherNet\/IP eller en anden feltbus med h\u00f8jere opl\u00f8sning og diagnostik.<\/li>\n<li><b>V\u00e6gtindikator<\/b> \u2013 display, taster og rel\u00e6udgange til vejning, gr\u00e6nsev\u00e6rdier og dosering ved v\u00e6gten. Godkendte modeller kan bruges til handel.<\/li>\n<\/ul>\n<p>N\u00e5r en v\u00e6gt har flere vejeceller, parallelforbindes de i en samled\u00e5se. Her kan du ogs\u00e5 justere hj\u00f8rnerne, s\u00e5 v\u00e6gten viser samme v\u00e6gt, uanset hvor lasten st\u00e5r.<\/p>\n<h2>Installation \u2013 her opst\u00e5r fejlene<\/h2>\n<p>Beregn den st\u00f8rste last pr. celle: tara plus maksimal last divideret med antallet af celler, og l\u00e6g en margin til for sk\u00e6v fordeling og st\u00f8d. Tre celler under en rund tank giver altid en j\u00e6vn fordeling. Med fire celler kan lasten fordele sig sk\u00e6vt, hvis underlaget ikke er plant.<\/p>\n<ol class=\"g-pit\">\n<li><b>Sidekr\u00e6fter og vridning.<\/b> Lasten skal angribe lige. Brug vejemoduler (monteringss\u00e6t), der optager termisk udvidelse og sm\u00e5 h\u00e6ldninger, og mont\u00e9r p\u00e5 plane, stive underlag.<\/li>\n<li><b>Stive r\u00f8r p\u00e5 tanke.<\/b> R\u00f8r, der er fast forbundet til en vejet tank, b\u00e6rer en del af v\u00e6gten. Brug fleksible tilslutninger.<\/li>\n<li><b>Svejsning t\u00e6t p\u00e5 v\u00e6gten.<\/b> Svejsestr\u00f8m gennem vejecellen kan \u00f8del\u00e6gge den. Tilslut svejsejorden t\u00e6t p\u00e5 svejsestedet, og led str\u00f8mmen uden om cellen med en jordfletning.<\/li>\n<li><b>St\u00f8d og overlast.<\/b> En last, der tabes fra lav h\u00f8jde, kan give en kraft langt over den nominelle. V\u00e6lg en margin, og brug mekaniske stop.<\/li>\n<li><b>Fugt og afkortet kabel.<\/b> Fugt i kabel eller samled\u00e5se giver drift. Hold alt t\u00e6t, og afkort aldrig et 4-lederkabel.<\/li>\n<\/ol>\n<h2>Hvor bruges vejeceller?<\/h2>\n<ul>\n<li><b>F\u00f8devarer og emballage<\/b> \u2013 doseringsv\u00e6gte, p\u00e5fyldning af s\u00e6kke og t\u00f8nder og kontrolv\u00e6gte i linjen.<\/li>\n<li><b>Procesindustri<\/b> \u2013 tank- og silovejning af r\u00e5varer, v\u00e6sker og pulver.<\/li>\n<li><b>Logistik og genbrug<\/b> \u2013 gulvv\u00e6gte, pallev\u00e6gte og brov\u00e6gte.<\/li>\n<li><b>L\u00f8ft og mobile maskiner<\/b> \u2013 overlastsikring p\u00e5 kraner, taljer og elevatorer.<\/li>\n<li><b>Energi<\/b> \u2013 vejning af flis og piller p\u00e5 biobr\u00e6ndselsanl\u00e6g.<\/li>\n<li><b>Test og forskning<\/b> \u2013 kraftm\u00e5ling i pr\u00f8vestande og materialepr\u00f8vning.<\/li>\n<\/ul>\n<h2>Vejeceller og vejeelektronik hos SCN<\/h2>\n<p>Vi har vejeceller, vejetransmittere og v\u00e6gtindikatorer fra Laumas, fra flade celler til sm\u00e5 v\u00e6gte over wirevejeceller til l\u00f8ft til godkendte indikatorer til dosering. Fort\u00e6l os om last, antal celler, milj\u00f8 og styresystem, s\u00e5 hj\u00e6lper vi dig med at s\u00e6tte hele k\u00e6den sammen.<\/p>\n<h3>Eksempler fra vores sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/laumas-ftkl-shear-beam-load-cell-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/laumas-ftkl-main.webp\" alt=\"Laumas FTKL shear beam-vejecelle\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Laumas<\/span><span class=\"g-pn\">FTKL shear beam-vejecelle<\/span><span class=\"g-pw\">Shear beam i forniklet st\u00e5l til 500\u20135 000 kg, godkendt efter OIML R60 C3, IP67.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/laumas-w200-weight-indicator-for-batching-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/laumas-w200-main.webp\" alt=\"Laumas W200 v\u00e6gtindikator til dosering\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Laumas<\/span><span class=\"g-pn\">W200 v\u00e6gtindikator til dosering<\/span><span class=\"g-pw\">V\u00e6gtindikator til dosering af op til 14 produkter, godkendt efter OIML R76 og R61, med PROFINET eller EtherNet\/IP som option.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/laumas-tlc-analog-weight-transmitter-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/laumas-tlc-main.webp\" alt=\"Laumas TLC analog vejetransmitter\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Laumas<\/span><span class=\"g-pn\">TLC analog vejetransmitter<\/span><span class=\"g-pw\">Kompakt kort, der oms\u00e6tter signalet fra op til fire vejeceller p\u00e5 350 \u03a9 til 4\u201320 mA eller 0\u201310 V til PLC&#8217;en.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/sensors-da\/load-cells-da\/\">Vejeceller<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/sensors-da\/\">Sensorer<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/control-systems-da\/plc-systems-da\/\">PLC-systemer<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/industrial-connectivity-da\/protocol-gateways-da\/\">Protokol-gateways<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/connectors-and-cables-da\/\">Stik og kabler<\/a><\/div>\n<div class=\"g-cta\">\n<p>Skal du bygge eller opgradere en v\u00e6gt? Sp\u00f8rg en af vores ingeni\u00f8rer om vejeceller og elektronik \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 betyder mV\/V p\u00e5 en vejecelle?<\/summary>\n<p>Det er udgangssignalet ved fuld last pr. volt forsyning. 2 mV\/V med 10 V forsyning giver 20 mV ved nominel last. V\u00e6rdien bruges, n\u00e5r elektronikken kalibreres.<\/p>\n<\/details>\n<details>\n<summary>Hvad betyder C3?<\/summary>\n<p>Klasse C efter OIML R60 med 3 000 verifikationsintervaller. Cellen er tilstr\u00e6kkelig til en v\u00e6gt med op til 3 000 delinger.<\/p>\n<\/details>\n<details>\n<summary>Hvor mange vejeceller har jeg brug for?<\/summary>\n<p>Tre giver en stabil fordeling under runde tanke og siloer. Rektangul\u00e6re platforme har ofte fire. Mindre platforme klarer sig med \u00e9n single point-celle.<\/p>\n<\/details>\n<details>\n<summary>Hvordan kontrollerer jeg en vejecelle?<\/summary>\n<p>M\u00e5l broens ind- og udgangsmodstand og isolationen mod huset, og kontroll\u00e9r nulsignalet uden last. Sammenlign med v\u00e6rdierne i databladet.<\/p>\n<\/details>\n<details>\n<summary>M\u00e5 jeg afkorte kablet?<\/summary>\n<p>Ikke et 4-lederkabel, fordi det indg\u00e5r i cellens kalibrering og temperaturkompensering. Et 6-lederkabel kan afkortes, fordi elektronikken m\u00e5ler forsyningen ved cellen.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>En vejecelle oms\u00e6tter kraft eller v\u00e6gt til et elektrisk signal og er hjertet i enhver industriel v\u00e6gt. Her gennemg\u00e5r vi, hvordan den virker, hvilke typer der findes, hvad C3 betyder, og hvordan du monterer den, s\u00e5 v\u00e6gten vejer rigtigt.<\/p>\n","protected":false},"author":11,"featured_media":8234328,"template":"","meta":{"_yoast_wpseo_focuskw":"vejecelle","_yoast_wpseo_metadesc":"Vejeceller forklaret: strain gauges, mV\/V, typer som shear beam og S-type, OIML-klasser som C3 og installation uden m\u00e5lefejl. Guide fra SCN.","_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":[682],"_scn_guide_sectors":[1011],"_scn_guide_type":"tech","_scn_guide_order":34,"footnotes":""},"class_list":["post-8234567","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>Vejeceller \u2013 typer, n\u00f8jagtighedsklasser og installation | SCN<\/title>\n<meta name=\"description\" content=\"Vejeceller forklaret: strain gauges, mV\/V, typer som shear beam og S-type, OIML-klasser som C3 og installation uden m\u00e5lefejl. 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