{"id":8234114,"date":"2026-10-24T17:28:22","date_gmt":"2026-10-24T17:28:22","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234114"},"modified":"2026-10-24T17:33:08","modified_gmt":"2026-10-24T17:33:08","slug":"lastceller","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/sv\/guider\/lastceller\/","title":{"rendered":"Lastceller \u2013 typer, noggrannhetsklasser och installation"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Lastceller \u2013 typer, noggrannhetsklasser och installation<\/h1>\n<p class=\"g-lead\">En lastcell g\u00f6r om kraft eller vikt till en elektrisk signal och \u00e4r hj\u00e4rtat i varje industriell v\u00e5g. H\u00e4r g\u00e5r vi igenom hur den fungerar, vilka typer som finns, vad C3 betyder och hur du monterar den s\u00e5 att v\u00e5gen v\u00e4ger r\u00e4tt.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>Princip<\/b> \u2013 tr\u00e5dt\u00f6jningsgivare i en Wheatstonebrygga ger n\u00e5gra millivolt per volt matning, ofta 2 mV\/V.<\/li>\n<li><b>Typ<\/b> \u2013 single point f\u00f6r plattformsv\u00e5gar, b\u00f6j- och skjuvbalk f\u00f6r golvv\u00e5gar och tankar, S-typ f\u00f6r drag och pelare f\u00f6r stora laster.<\/li>\n<li><b>Klass<\/b> \u2013 C3 betyder klass C enligt OIML R60 med 3 000 verifieringsintervall. Det r\u00e4cker f\u00f6r de flesta industriv\u00e5gar.<\/li>\n<li><b>Elektronik<\/b> \u2013 en viktransmitter eller viktindikator g\u00f6r om signalen till 4\u201320 mA, 0\u201310 V eller f\u00e4ltbuss.<\/li>\n<li><b>Montering<\/b> \u2013 sidokrafter, st\u00f6tar, svetsstr\u00f6m och stela r\u00f6r ger oftare fel \u00e4n sj\u00e4lva lastcellen.<\/li>\n<\/ul>\n<\/div>\n<h2>S\u00e5 fungerar en lastcell<\/h2>\n<p>En lastcell \u00e4r en metallkropp, oftast av st\u00e5l eller aluminium, som b\u00f6jer sig mycket lite n\u00e4r den belastas. P\u00e5 kroppen sitter tr\u00e5dt\u00f6jningsgivare: tunna metallfolier vars resistans \u00e4ndras n\u00e4r de t\u00f6js eller trycks ihop. Fyra givare \u00e4r kopplade i en <b>Wheatstonebrygga<\/b>. Tv\u00e5 t\u00f6js och tv\u00e5 trycks ihop, s\u00e5 att signalen blir s\u00e5 stor som m\u00f6jligt medan temperatureffekter tar ut varandra.<\/p>\n<p>Bryggan matas med en sp\u00e4nning, ofta 5 eller 10 V. Utsignalen anges i <b>mV\/V<\/b> vid full last. En lastcell med 2 mV\/V och 10 V matning ger allts\u00e5 20 mV vid nominell last. Signalen \u00e4r svag och f\u00f6rst\u00e4rks i en viktindikator eller transmitter med h\u00f6g uppl\u00f6sning.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-lastcell-f1-sv.webp\" alt=\"Wheatstonebrygga med fyra tr\u00e5dt\u00f6jningsgivare. N\u00e4r balken belastas t\u00f6js tv\u00e5 givare och tv\u00e5 trycks ihop. Med 2 mV\/V och 10 V matning blir signalen 20 mV vid full last.\" width=\"1520\" height=\"604\" loading=\"lazy\" decoding=\"async\"><figcaption>Fyra tr\u00e5dt\u00f6jningsgivare i en Wheatstonebrygga ger en signal i millivolt per volt matning.<\/figcaption><\/figure>\n<p>Kabeln har fyra eller sex ledare. Med sex ledare m\u00e4ter elektroniken matningssp\u00e4nningen direkt vid lastcellen, s\u00e5 att kabelns sp\u00e4nningsfall inte p\u00e5verkar. En fyrledarkabel ing\u00e5r i cellens kalibrering och ska inte kortas.<\/p>\n<h2>Vilken typ av lastcell beh\u00f6ver du?<\/h2>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-lastcell-f2-sv.webp\" alt=\"Fem typer av lastceller: single point, b\u00f6jbalk, skjuvbalk, S-typ och pelare, med pilar som visar hur kraften angriper.\" width=\"1520\" height=\"452\" loading=\"lazy\" decoding=\"async\"><figcaption>Lastcellens form avg\u00f6r hur den ska belastas och vilka v\u00e5gar den passar f\u00f6r.<\/figcaption><\/figure>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Typ<\/th>\n<th>Typisk anv\u00e4ndning<\/th>\n<th>K\u00e4nnetecken<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">Single point<\/td>\n<td>Plattformsv\u00e5gar, b\u00e4nkv\u00e5gar, f\u00f6rpackningsmaskiner<\/td>\n<td>En cell under plattformen. Kompenserad f\u00f6r last som inte st\u00e5r i mitten.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">B\u00f6jbalk<\/td>\n<td>Sm\u00e5 v\u00e5gar och doseringsv\u00e5gar<\/td>\n<td>Enkel och prisv\u00e4rd vid l\u00e5ga laster.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Skjuvbalk<\/td>\n<td>Golvv\u00e5gar, pallv\u00e5gar, tankar och silor<\/td>\n<td>M\u00e4ter skjuvning och \u00e4r mindre k\u00e4nslig f\u00f6r var lasten angriper. Vanlig upp till tiotals ton.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">S-typ<\/td>\n<td>H\u00e4ngande v\u00e5gar, dragprov, lyft<\/td>\n<td>M\u00e4ter drag och tryck i linje.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Pelare<\/td>\n<td>Fordonsv\u00e5gar, stora silor och tankar<\/td>\n<td>F\u00f6r mycket stora laster, upp till hundratals ton.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Det finns ocks\u00e5 specialceller, till exempel linlastceller som s\u00e4tts direkt p\u00e5 en vajer och fungerar som \u00f6verlastskydd p\u00e5 lyftutrustning.<\/p>\n<h2>Noggrannhetsklasser \u2013 vad betyder C3?<\/h2>\n<p>Lastceller f\u00f6r v\u00e5gar som anv\u00e4nds i handel klassas enligt <b>OIML R60<\/b>. Bokstaven anger noggrannhetsklassen och siffran hur m\u00e5nga verifieringsintervall, i tusental, som cellen klarar. C3 betyder klass C med 3 000 intervall, C6 klass C med 6 000.<\/p>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Klass<\/th>\n<th>Antal intervall<\/th>\n<th>Typisk anv\u00e4ndning<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">A<\/td>\n<td>50 000 och fler<\/td>\n<td>Precisionsv\u00e4gning i laboratorier<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">B<\/td>\n<td>5 000\u2013100 000<\/td>\n<td>Precisionsv\u00e5gar<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">C<\/td>\n<td>500\u201310 000<\/td>\n<td>Industri- och handelsv\u00e5gar<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">D<\/td>\n<td>100\u20131 000<\/td>\n<td>Enkla v\u00e5gar<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Sj\u00e4lva v\u00e5gen klassas enligt <b>OIML R76<\/b>, d\u00e4r klass III \u00e4r vanligast i industri och handel. Lastcellernas intervall m\u00e5ste r\u00e4cka till v\u00e5gens antal delningar. En v\u00e5g f\u00f6r 3 000 kg med 1 kg delning beh\u00f6ver lastceller som klarar minst 3 000 intervall, till exempel C3. Automatiska p\u00e5fyllningsv\u00e5gar omfattas av OIML R61.<\/p>\n<p>J\u00e4mf\u00f6r ocks\u00e5 kombinerat fel (linj\u00e4ritet och hysteres), krypning under konstant last och hur temperaturen p\u00e5verkar noll och k\u00e4nslighet.<\/p>\n<h2>Fr\u00e5n lastcell till styrsystem<\/h2>\n<ul>\n<li><b>Analog viktransmitter<\/b> \u2013 g\u00f6r om signalen till 4\u201320 mA eller 0\u201310 V f\u00f6r PLC:ns analoga ing\u00e5ng. Enkelt, men ing\u00e5ngskortet begr\u00e4nsar uppl\u00f6sningen.<\/li>\n<li><b>Digital viktransmitter<\/b> \u2013 skickar vikten via Modbus, PROFINET, EtherNet\/IP eller annan f\u00e4ltbuss, med h\u00f6gre uppl\u00f6sning och diagnostik.<\/li>\n<li><b>Viktindikator<\/b> \u2013 display, knappar och rel\u00e4utg\u00e5ngar f\u00f6r v\u00e4gning, gr\u00e4nsv\u00e4rden och dosering vid v\u00e5gen. Godk\u00e4nda modeller kan anv\u00e4ndas f\u00f6r handel.<\/li>\n<\/ul>\n<p>N\u00e4r en v\u00e5g har flera lastceller kopplas de parallellt i en kopplingsl\u00e5da. D\u00e4r kan du \u00e4ven justera h\u00f6rnen s\u00e5 att v\u00e5gen visar samma vikt oavsett var lasten st\u00e5r.<\/p>\n<h2>Installation \u2013 h\u00e4r uppst\u00e5r felen<\/h2>\n<p>R\u00e4kna fram den st\u00f6rsta lasten per cell: tara plus maxlast, delat med antalet celler, och l\u00e4gg till marginal f\u00f6r oj\u00e4mn f\u00f6rdelning och st\u00f6tar. Tre celler under en rund tank ger alltid j\u00e4mn f\u00f6rdelning. Med fyra celler kan lasten f\u00f6rdela sig oj\u00e4mnt om underlaget inte \u00e4r plant.<\/p>\n<ol class=\"g-pit\">\n<li><b>Sidokrafter och vridning.<\/b> Lasten ska angripa rakt. Anv\u00e4nd v\u00e4gmoduler (monteringssatser) som tar upp v\u00e4rmeutvidgning och sm\u00e5 lutningar, och montera p\u00e5 plana, styva underlag.<\/li>\n<li><b>Stela r\u00f6r p\u00e5 tankar.<\/b> R\u00f6r som \u00e4r fast kopplade till en v\u00e4gd tank b\u00e4r en del av vikten. Anv\u00e4nd flexibla anslutningar.<\/li>\n<li><b>Svetsning n\u00e4ra v\u00e5gen.<\/b> Svetsstr\u00f6m genom lastcellen kan f\u00f6rst\u00f6ra den. Anslut svetsjorden n\u00e4ra svetsst\u00e4llet och led str\u00f6mmen f\u00f6rbi cellen med en jordfl\u00e4ta.<\/li>\n<li><b>St\u00f6tar och \u00f6verlast.<\/b> En last som sl\u00e4pps fr\u00e5n l\u00e5g h\u00f6jd kan ge en kraft l\u00e5ngt \u00f6ver den nominella. V\u00e4lj marginal och anv\u00e4nd mekaniska stopp.<\/li>\n<li><b>Fukt och kortad kabel.<\/b> Fukt i kabel eller kopplingsl\u00e5da ger drift. H\u00e5ll allt t\u00e4tt, och korta aldrig en fyrledarkabel.<\/li>\n<\/ol>\n<h2>Var anv\u00e4nds lastceller?<\/h2>\n<ul>\n<li><b>Livsmedel och f\u00f6rpackning<\/b> \u2013 doseringsv\u00e5gar, p\u00e5fyllning av s\u00e4ckar och fat och kontrollv\u00e5gar i linjen.<\/li>\n<li><b>Processindustri<\/b> \u2013 tank- och silov\u00e4gning av r\u00e5varor, v\u00e4tskor och pulver.<\/li>\n<li><b>Logistik och \u00e5tervinning<\/b> \u2013 golvv\u00e5gar, pallv\u00e5gar och fordonsv\u00e5gar.<\/li>\n<li><b>Lyft och mobila maskiner<\/b> \u2013 \u00f6verlastskydd p\u00e5 kranar, telfrar och hissar.<\/li>\n<li><b>Energi<\/b> \u2013 v\u00e4gning av flis och pellets i biobr\u00e4nsleanl\u00e4ggningar.<\/li>\n<li><b>Provning och forskning<\/b> \u2013 kraftm\u00e4tning i provb\u00e4nkar och materialprovning.<\/li>\n<\/ul>\n<h2>Lastceller och v\u00e4gelektronik hos SCN<\/h2>\n<p>Vi har lastceller, viktransmittrar och viktindikatorer fr\u00e5n Laumas, fr\u00e5n platta celler f\u00f6r sm\u00e5 v\u00e5gar till linlastceller f\u00f6r lyft och godk\u00e4nda indikatorer f\u00f6r dosering. Ber\u00e4tta om last, antal celler, milj\u00f6 och styrsystem, s\u00e5 hj\u00e4lper vi dig att s\u00e4tta ihop hela kedjan.<\/p>\n<h3>Exempel ur v\u00e5rt sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/laumas-ftkl-shear-beam-load-cell-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/laumas-ftkl-main.webp\" alt=\"Laumas FTKL skjuvbalkslastcell\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Laumas<\/span><span class=\"g-pn\">FTKL skjuvbalkslastcell<\/span><span class=\"g-pw\">Skjuvbalk i f\u00f6rnicklat st\u00e5l f\u00f6r 500\u20135 000 kg, godk\u00e4nd enligt OIML R60 C3, IP67.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/laumas-w200-weight-indicator-for-batching-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/laumas-w200-main.webp\" alt=\"Laumas W200 viktindikator f\u00f6r dosering\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Laumas<\/span><span class=\"g-pn\">W200 viktindikator f\u00f6r dosering<\/span><span class=\"g-pw\">Viktindikator f\u00f6r dosering av upp till 14 produkter, godk\u00e4nd enligt OIML R76 och R61, med PROFINET eller EtherNet\/IP som tillval.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/laumas-tlc-analog-weight-transmitter-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/laumas-tlc-main.webp\" alt=\"Laumas TLC analog vikts\u00e4ndare\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Laumas<\/span><span class=\"g-pn\">TLC analog vikts\u00e4ndare<\/span><span class=\"g-pw\">Kompakt kort som g\u00f6r om signalen fr\u00e5n upp till fyra lastceller p\u00e5 350 \u03a9 till 4\u201320 mA eller 0\u201310 V f\u00f6r PLC:n.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/sensors-sv\/load-cells-sv\/\">Lastceller<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/sensors-sv\/\">Sensorer<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/control-systems-sv\/plc-systems-sv\/\">PLC-system<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/network-products-sv\/industrial-connectivity\/protocol-gateways\/\">Protokollgateways<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/connectors-and-cables-sv\/\">Kontaktdon och kablar<\/a><\/div>\n<div class=\"g-cta\">\n<p>Ska du bygga eller uppgradera en v\u00e5g? Fr\u00e5ga en av v\u00e5ra ingenj\u00f6rer om lastceller och elektronik \u2013 du f\u00e5r svar inom 24 timmar.<\/p>\n<p><a href=\"https:\/\/scn.eu\/sv\/kontakt\/\">Fr\u00e5ga en ingenj\u00f6r<\/a><\/div>\n<h2>Vanliga fr\u00e5gor<\/h2>\n<details>\n<summary>Vad betyder mV\/V p\u00e5 en lastcell?<\/summary>\n<p>Det \u00e4r utsignalen vid full last per volt matning. 2 mV\/V med 10 V matning ger 20 mV vid nominell last. V\u00e4rdet anv\u00e4nds n\u00e4r elektroniken kalibreras.<\/p>\n<\/details>\n<details>\n<summary>Vad betyder C3?<\/summary>\n<p>Klass C enligt OIML R60 med 3 000 verifieringsintervall. Cellen r\u00e4cker f\u00f6r en v\u00e5g med upp till 3 000 delningar.<\/p>\n<\/details>\n<details>\n<summary>Hur m\u00e5nga lastceller beh\u00f6ver jag?<\/summary>\n<p>Tre ger stabil f\u00f6rdelning under runda tankar och silor. Rektangul\u00e4ra plattformar har ofta fyra. Mindre plattformar klarar sig med en single point-cell.<\/p>\n<\/details>\n<details>\n<summary>Hur kontrollerar jag en lastcell?<\/summary>\n<p>M\u00e4t bryggans in- och utg\u00e5ngsresistans och isolationen mot huset, och kontrollera nollsignalen utan last. J\u00e4mf\u00f6r med v\u00e4rdena i databladet.<\/p>\n<\/details>\n<details>\n<summary>F\u00e5r jag korta kabeln?<\/summary>\n<p>Inte en fyrledarkabel, eftersom den ing\u00e5r i cellens kalibrering och temperaturkompensering. En sexledarkabel kan kortas, eftersom elektroniken m\u00e4ter matningen vid cellen.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>En lastcell g\u00f6r om kraft eller vikt till en elektrisk signal och \u00e4r hj\u00e4rtat i varje industriell v\u00e5g. H\u00e4r g\u00e5r vi igenom hur den fungerar, vilka typer som finns, vad C3 betyder och hur du monterar den s\u00e5 att v\u00e5gen v\u00e4ger r\u00e4tt.<\/p>\n","protected":false},"author":11,"featured_media":8234050,"template":"","meta":{"_yoast_wpseo_focuskw":"lastcell","_yoast_wpseo_metadesc":"Lastceller f\u00f6rklarade: tr\u00e5dt\u00f6jningsgivare, mV\/V, typer som skjuvbalk och S-typ, OIML-klasser som C3 och installation utan m\u00e4tfel. Guide fr\u00e5n 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-8234114","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>Lastceller \u2013 typer, noggrannhetsklasser och installation | SCN<\/title>\n<meta name=\"description\" content=\"Lastceller f\u00f6rklarade: tr\u00e5dt\u00f6jningsgivare, mV\/V, typer som skjuvbalk och S-typ, OIML-klasser som C3 och installation utan m\u00e4tfel. 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