{"id":8234565,"date":"2026-10-24T17:30:18","date_gmt":"2026-10-24T17:30:18","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234565"},"modified":"2026-10-24T17:30:18","modified_gmt":"2026-10-24T17:30:18","slug":"tryksensorer","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/da\/guider\/tryksensorer\/","title":{"rendered":"Tryksensorer og trykkontakter \u2013 s\u00e5dan v\u00e6lger du rigtigt"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Tryksensorer og trykkontakter \u2013 s\u00e5dan v\u00e6lger du rigtigt<\/h1>\n<p class=\"g-lead\">En tryksensor oms\u00e6tter trykket i olie, luft, vand eller gas til et elektrisk signal. Her gennemg\u00e5r vi forskellen p\u00e5 sensor, transmitter og trykkontakt, hvad n\u00f8jagtigheden egentlig d\u00e6kker, og hvordan du undg\u00e5r de mest almindelige fejl.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>Reference<\/b> \u2013 beslut f\u00f8rst, hvad trykket skal sammenlignes med: den omgivende luft (relativt tryk), vakuum (absolut tryk) eller et andet tryk (differenstryk).<\/li>\n<li><b>Transmitter eller trykkontakt<\/b> \u2013 en transmitter giver et m\u00e5lesignal som 4\u201320 mA, 0\u201310 V eller CAN. En trykkontakt skifter blot en kontakt ved et indstillet tryk.<\/li>\n<li><b>M\u00e5leomr\u00e5de<\/b> \u2013 en tommelfingerregel er, at det normale driftstryk ligger p\u00e5 50\u201375 % af omr\u00e5det. Kontroll\u00e9r overlasttrykket i forhold til trykst\u00f8d.<\/li>\n<li><b>N\u00f8jagtighed<\/b> \u2013 sammenlign den samlede fejl over hele temperaturomr\u00e5det, ikke kun lineariteten ved stuetemperatur.<\/li>\n<li><b>Materialer<\/b> \u2013 mediet bestemmer valget: rustfrit st\u00e5l, keramik eller plast og en pakning, der kan t\u00e5le v\u00e6sken.<\/li>\n<\/ul>\n<\/div>\n<h2>Relativt tryk, absolut tryk eller differenstryk?<\/h2>\n<p>Alt tryk m\u00e5les i forhold til en reference. <b>Relativt tryk (overtryk)<\/b> m\u00e5les i forhold til det omgivende lufttryk. Det er det, du ser p\u00e5 manometeret i et hydraulikanl\u00e6g eller en trykluftledning. <b>Absolut tryk<\/b> m\u00e5les i forhold til vakuum og bruges, n\u00e5r variationer i lufttrykket ikke m\u00e5 p\u00e5virke m\u00e5lingen, for eksempel i vakuumprocesser, barometriske m\u00e5linger og gasblanding. <b>Differenstryk<\/b> er forskellen mellem to porte, for eksempel over et filter, en ventilator eller en m\u00e5lebl\u00e6nde til flowm\u00e5ling.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-tryck-f1-da.webp\" alt=\"Tre m\u00e5leceller: relativt tryk m\u00e5les mod den omgivende luft, absolut tryk mod vakuum og differenstryk mellem to porte\" width=\"1520\" height=\"500\" loading=\"lazy\" decoding=\"async\"><figcaption>Referencen bestemmer, hvad sensoren m\u00e5ler: den omgivende luft, vakuum eller et andet tryk.<\/figcaption><\/figure>\n<div class=\"g-short\">\n<p style=\"margin:0\">Enheder: 1 bar = 100 kPa = 0,1 MPa, og 1 psi er cirka 69 mbar. Amerikanske datablade skriver psig for relativt tryk, psia for absolut tryk og psid for differenstryk.<\/p>\n<\/div>\n<h2>Sensor, transmitter eller trykkontakt \u2013 hvad er forskellen?<\/h2>\n<ul>\n<li><b>Tryksensor (transducer)<\/b> \u2013 m\u00e5lecellen med et simpelt signal, ofte nogle f\u00e5 millivolt pr. volt forsyning (mV\/V). Signalet skal forst\u00e6rkes.<\/li>\n<li><b>Tryktransmitter<\/b> \u2013 en sensor med indbygget elektronik, der giver et standardsignal. Det er det, de fleste i dag mener med en tryksensor.<\/li>\n<li><b>Trykkontakt (pressostat)<\/b> \u2013 skifter en kontakt, n\u00e5r trykket passerer et koblingspunkt. Mekaniske trykkontakter med membran og fjeder kr\u00e6ver ingen forsyning. Elektroniske trykkontakter har ofte b\u00e5de koblingsudgang og analogt signal.<\/li>\n<\/ul>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-tryck-f2-da.webp\" alt=\"Blokdiagram: en tryksensor giver et svagt millivoltsignal, en transmitter har elektronik, der giver et standardsignal, og en trykkontakt skifter en kontakt ved et koblingspunkt\" width=\"1520\" height=\"472\" loading=\"lazy\" decoding=\"async\"><figcaption>Den samme m\u00e5lecelle kan sidde i en sensor, en transmitter eller en trykkontakt. Elektronikken bestemmer signalet.<\/figcaption><\/figure>\n<p>V\u00e6lg en trykkontakt, n\u00e5r du kun skal vide, om trykket er for h\u00f8jt eller for lavt, for eksempel lavt olietryk, et tilstoppet filter eller trykfald i trykluften. V\u00e6lg en transmitter, n\u00e5r styringen skal regulere, logge eller give alarm p\u00e5 flere niveauer. Til sikkerhedsfunktioner findes trykkontakter, der er vurderet efter IEC 61508 (SIL) og ISO 13849 (PL).<\/p>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Udgangssignal<\/th>\n<th>Fordel<\/th>\n<th>V\u00e6r opm\u00e6rksom p\u00e5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">4\u201320 mA<\/td>\n<td>T\u00e5ler lange kabler og elektrisk st\u00f8j. Str\u00f8mmen p\u00e5 4 mA ved nul g\u00f8r, at et kabelbrud opdages med det samme.<\/td>\n<td>Forsyning og signal g\u00e5r som regel i de samme to ledere. Kontroll\u00e9r den st\u00f8rste tilladte belastningsmodstand.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">0\u201310 V<\/td>\n<td>Nem at l\u00e6se ind.<\/td>\n<td>Mere f\u00f8lsom over for st\u00f8j og sp\u00e6ndingsfald p\u00e5 lange kabler.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Ratiometrisk<\/td>\n<td>Udbredt i k\u00f8ret\u00f8jer. Signalet f\u00f8lger forsyningen, for eksempel 10\u201390 % af den.<\/td>\n<td>Styreenheden skal m\u00e5le i forhold til samme forsyningssp\u00e6nding.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">CANopen, SAE J1939<\/td>\n<td>Mange sensorer p\u00e5 samme bus, med diagnostik.<\/td>\n<td>Adresse og busterminering skal indstilles korrekt.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">IO-Link<\/td>\n<td>Parametrering og diagnostik via et almindeligt sensorkabel (IEC 61131-9).<\/td>\n<td>Kr\u00e6ver en IO-Link-master.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>M\u00e5leomr\u00e5de, overlast og trykst\u00f8d<\/h2>\n<p>M\u00e5leomr\u00e5det skal d\u00e6kke det normale driftstryk med margin. Et for stort omr\u00e5de giver en st\u00f8rre fejl regnet i bar, fordi fejlen angives i procent af fuldt udslag (FS). En fejl p\u00e5 \u00b10,5 % FS er \u00b13 bar p\u00e5 en 600 bar-sensor, ogs\u00e5 n\u00e5r du m\u00e5ler 20 bar.<\/p>\n<p>Databladet angiver ogs\u00e5 <b>overlasttryk (proof pressure)<\/b>, som sensoren t\u00e5ler uden blivende \u00e6ndring, og <b>spr\u00e6ngtryk (burst pressure)<\/b>, hvor den g\u00e5r i stykker. Mellem de to kan sensoren f\u00e5 en blivende nulpunktsfejl.<\/p>\n<p>Trykst\u00f8d er en hyppig \u00e5rsag til defekte sensorer i hydraulik og vandanl\u00e6g. N\u00e5r en ventil lukker hurtigt, kan trykket i nogle f\u00e5 millisekunder blive flere gange h\u00f8jere end normalt \u2013 for hurtigt til at kunne ses p\u00e5 et manometer. En dyse (snubber) i sensorens tilslutning d\u00e6mper toppen. Kavitation, hvor dampbobler klapper sammen, giver b\u00e5de trykspidser og erosion. Plac\u00e9r ikke sensoren lige efter en pumpe, en ventil eller en drosling.<\/p>\n<h2>Hvad d\u00e6kker n\u00f8jagtigheden?<\/h2>\n<p>To sensorer med 0,25 % i databladet kan opf\u00f8re sig meget forskelligt i praksis. Kontroll\u00e9r, hvad tallet omfatter:<\/p>\n<ul>\n<li><b>Linearitet<\/b> \u2013 afvigelsen fra en ret linje. Angives den som BFSL (bedst tilpassede linje), bliver tallet lavere end m\u00e5lt mellem nul og fuldt udslag.<\/li>\n<li><b>Hysterese<\/b> \u2013 forskellen i signal ved samme tryk, afh\u00e6ngigt af om trykket stiger eller falder.<\/li>\n<li><b>Repeterbarhed<\/b> \u2013 hvor ens resultaterne bliver ved gentagne m\u00e5linger.<\/li>\n<li><b>Temperaturfejl<\/b> \u2013 hvordan nulpunkt og f\u00f8lsomhed \u00e6ndrer sig med temperaturen. Ofte det st\u00f8rste bidrag i mobile maskiner og udend\u00f8rs.<\/li>\n<li><b>Langtidsstabilitet<\/b> \u2013 hvor meget sensoren driver pr. \u00e5r.<\/li>\n<\/ul>\n<p>Det mest brugbare tal er <b>den samlede fejl (total error band)<\/b> over hele det kompenserede temperaturomr\u00e5de. Den samler alle bidrag og viser, hvor meget m\u00e5lev\u00e6rdien reelt kan afvige.<\/p>\n<h2>Medier, materialer og montage<\/h2>\n<p>Alt, der er i kontakt med mediet, skal kunne t\u00e5le det. Rustfrit st\u00e5l 316L klarer de fleste olier, vand og gasser. Keramiske m\u00e5leceller t\u00e5ler mange aggressive medier. Til ultrarene processer og st\u00e6rke syrer findes trykkontakter med dele i PFA og PTFE. Glem ikke pakningen: FKM, EPDM og NBR t\u00e5ler forskellige v\u00e6sker, og helsvejste sensorer har slet ingen pakning.<\/p>\n<ol class=\"g-pit\">\n<li><b>Forkert placering p\u00e5 r\u00f8ret.<\/b> Ved v\u00e6sker skal sensoren monteres p\u00e5 siden af r\u00f8ret, s\u00e5 luft ikke samler sig ved membranen, og slam ikke s\u00e6tter sig. Ved gas monteres den ovenp\u00e5, s\u00e5 kondensvand kan l\u00f8be v\u00e6k.<\/li>\n<li><b>Tilstoppet trykudligning.<\/b> En relativtrykssensor skal have forbindelse til den omgivende luft via kablet eller en trykudligningsmembran. Bliver den stoppet til af maling eller vand, begynder m\u00e5lev\u00e6rdien at f\u00f8lge lufttryk og temperatur.<\/li>\n<li><b>Varm damp direkte p\u00e5 sensoren.<\/b> Ved damp og varme medier beskytter en sifon eller et k\u00f8leelement sensoren mod temperaturer over databladets gr\u00e6nse.<\/li>\n<li><b>For h\u00e5rdt tilsp\u00e6ndt tilslutning.<\/b> Et oversp\u00e6ndt gevind kan deformere huset og give nulpunktsfejl, is\u00e6r p\u00e5 sensorer til lave tryk. F\u00f8lg producentens tilsp\u00e6ndingsmoment.<\/li>\n<\/ol>\n<h2>Hvor bruges tryksensorer og trykkontakter?<\/h2>\n<ul>\n<li><b>Mobile maskiner<\/b> \u2013 kraner, skovmaskiner og gummigeder m\u00e5ler hydraulisk tryk til lastberegning, overlastbeskyttelse og styring.<\/li>\n<li><b>Fabrikker og maskinbyggeri<\/b> \u2013 trykluft, sm\u00f8resystemer, k\u00f8levand og hydrauliske presser. En trykkontakt stopper maskinen ved lavt olietryk.<\/li>\n<li><b>Energi og vand<\/b> \u2013 fjernvarme, varmepumper, pumpestationer og hydraulik i vandkraftv\u00e6rker.<\/li>\n<li><b>Plast og f\u00f8devarer<\/b> \u2013 smeltetryk i ekstrudere og spr\u00f8jtest\u00f8bemaskiner og hygiejniske sensorer i processer, der reng\u00f8res med CIP.<\/li>\n<li><b>Luftfart og forsvar<\/b> \u2013 hydraulik til styreflader, bremser og understel med svejste, hermetisk t\u00e6tte sensorer og trykkontakter.<\/li>\n<\/ul>\n<h2>Tryksensorer og trykkontakter hos SCN<\/h2>\n<p>Vi har tryktransmittere til mobil hydraulik fra Huba Control samt sensorer og trykkontakter til h\u00f8jrene gasser, luftfart og procesindustri fra Precision Sensors, Sensata og Nominal Controls. Fort\u00e6l os om medie, tryk, signal og milj\u00f8, s\u00e5 hj\u00e6lper vi dig med at finde en sensor, der passer.<\/p>\n<h3>Eksempler fra vores sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/604-tryksensor\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/pic_604.jpg\" alt=\"Huba Control 604 Tryksensor\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Huba Control<\/span><span class=\"g-pn\">604 Tryksensor<\/span><span class=\"g-pw\">Differenstrykkontakt til ventilation: overv\u00e5ger filtre og ventilatorer og beskytter varmeflader mod overophedning.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/staset-sil-3-pressure-switch-transducer-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/precision-sensors-staset-main.webp\" alt=\"Precision Sensors Staset SIL 3 trykkontakt og tryktransmitter\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Precision Sensors<\/span><span class=\"g-pn\">Staset SIL 3 trykkontakt og tryktransmitter<\/span><span class=\"g-pw\">Trykkontakt, transmitter og display i \u00e9n enhed. Koblingsudgangen opfylder SIL 3 efter IEC 61508 og PL e efter ISO 13849.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/px500-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/PX500.png\" alt=\"Sensata PX500 tryktransmitter\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Sensata<\/span><span class=\"g-pn\">PX500 tryktransmitter<\/span><span class=\"g-pw\">Tryktransmitter fra Sensata til \u221255 til 150 \u00b0C.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/sensors-da\/pressure-sensors\/\">Tryksensorer og tryktransmittere<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/sensors-da\/pressure-sensors\/pressure-sensors-mobile\/\">Tryksensorer til mobile maskiner<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/sensors-da\/pressure-sensors\/pressure-switches-da\/\">Trykkontakter<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/can-interfaces-da\/\">CAN-interfaces<\/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>Er du i tvivl om m\u00e5leomr\u00e5de, signal eller materiale? 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 en tryksensor og en tryktransmitter?<\/summary>\n<p>En transmitter har indbygget elektronik, der giver et standardsignal, for eksempel 4\u201320 mA. En sensor i sn\u00e6ver forstand giver et svagt millivoltsignal, der skal forst\u00e6rkes. I daglig tale bruges ordene i fl\u00e6ng.<\/p>\n<\/details>\n<details>\n<summary>Skal jeg v\u00e6lge 4\u201320 mA eller 0\u201310 V?<\/summary>\n<p>4\u201320 mA t\u00e5ler st\u00f8j og lange kabler bedre, og et kabelbrud opdages med det samme, fordi str\u00f8mmen falder under 4 mA. 0\u201310 V fungerer fint over korte afstande inde i maskinen eller tavlen.<\/p>\n<\/details>\n<details>\n<summary>Hvordan v\u00e6lger jeg m\u00e5leomr\u00e5de?<\/summary>\n<p>V\u00e6lg det, s\u00e5 det normale driftstryk ligger p\u00e5 cirka 50\u201375 % af omr\u00e5det, og trykspidser ligger under overlasttrykket. Et for stort omr\u00e5de giver en st\u00f8rre fejl regnet i bar.<\/p>\n<\/details>\n<details>\n<summary>Hvorfor driver min tryksensor?<\/summary>\n<p>Typiske \u00e5rsager er trykst\u00f8d over overlastgr\u00e6nsen, temperatur uden for det kompenserede omr\u00e5de, en tilstoppet trykudligning eller en for h\u00e5rdt tilsp\u00e6ndt tilslutning.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>En tryksensor oms\u00e6tter trykket i olie, luft, vand eller gas til et elektrisk signal. Her gennemg\u00e5r vi forskellen p\u00e5 sensor, transmitter og trykkontakt, hvad n\u00f8jagtigheden egentlig d\u00e6kker, og hvordan du undg\u00e5r de mest almindelige fejl.<\/p>\n","protected":false},"author":11,"featured_media":8234520,"template":"","meta":{"_yoast_wpseo_focuskw":"tryksensor","_yoast_wpseo_metadesc":"Tryksensor, transmitter eller trykkontakt? S\u00e5dan v\u00e6lger du reference, m\u00e5leomr\u00e5de, udgangssignal og materiale \u2013 og undg\u00e5r trykst\u00f8d og m\u00e5lefejl.","_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":[660,662,12221],"_scn_guide_sectors":[1011,1037],"_scn_guide_type":"tech","_scn_guide_order":30,"footnotes":""},"class_list":["post-8234565","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>Tryksensorer og trykkontakter \u2013 s\u00e5dan v\u00e6lger du rigtigt | SCN<\/title>\n<meta name=\"description\" content=\"Tryksensor, transmitter eller trykkontakt? 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