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Dit is echter niet verplicht." class=""><span>Account aanmaken</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Speciaal:Aanmelden&returnto=Stroomlus" title="U wordt van harte uitgenodigd om aan te melden, maar dit is niet verplicht [o]" accesskey="o" class=""><span>Aanmelden</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Meer opties" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Persoonlijke hulpmiddelen" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Persoonlijke hulpmiddelen</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Gebruikersmenu" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="https://donate.wikimedia.org/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=nl.wikipedia.org&uselang=nl"><span>Doneren</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Speciaal:GebruikerAanmaken&returnto=Stroomlus" title="Registreer u vooral en meld u aan. Dit is echter niet verplicht."><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Account aanmaken</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Speciaal:Aanmelden&returnto=Stroomlus" title="U wordt van harte uitgenodigd om aan te melden, maar dit is niet verplicht [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Aanmelden</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pagina's voor uitgelogde redacteuren <a href="/wiki/Help:Inleiding" aria-label="Meer leren over bewerken"><span>meer lezen</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Speciaal:MijnBijdragen" title="Bijdragen IP-adres [y]" accesskey="y"><span>Bijdragen</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Speciaal:MijnOverleg" title="Overlegpagina van de anonieme gebruiker van dit IP-adres [n]" accesskey="n"><span>Overleg</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Stroomlus</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Ga naar een artikel in een andere taal. Beschikbaar in 8 talen" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-8" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">8 talen</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Bucle_de_corrent_(PID)" title="Bucle de corrent (PID) – Catalaans" lang="ca" hreflang="ca" data-title="Bucle de corrent (PID)" data-language-autonym="Català" data-language-local-name="Catalaans" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a 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href="/wiki/Bestand:20mA-Schnittstelle.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/25/20mA-Schnittstelle.png/300px-20mA-Schnittstelle.png" decoding="async" width="300" height="159" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/25/20mA-Schnittstelle.png/450px-20mA-Schnittstelle.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/25/20mA-Schnittstelle.png/600px-20mA-Schnittstelle.png 2x" data-file-width="660" data-file-height="350" /></a><figcaption>Diagram van een 4-20 mA-interface met een PT100-temperatuursensor en analoge display</figcaption></figure> <p>Een 4-20mA-<b>stroomlus</b> is een tweedraads <a href="/wiki/Elektrisch" class="mw-redirect" title="Elektrisch">elektrische</a> verbinding, gevoed door een <a href="/wiki/Spanningsregelaar" title="Spanningsregelaar">constante spanning</a> van (maximaal 24 <a href="/wiki/Volt_(eenheid)" title="Volt (eenheid)">V</a>) en aangesloten op een omvormer die een te meten grootheid omzet in een <a href="/wiki/Gelijkstroom" title="Gelijkstroom">gelijkstroom</a> tussen 4 en 20 <a href="/wiki/Amp%C3%A8re_(eenheid)" title="Ampère (eenheid)">mA</a>. Dit is een signaaltransmissiestandaard voor industriële instrumentatie en communicatie waarbij 4 mA nul procent van de gemeten grootheid en 20 mA honderd procent voorstelt. </p><p><a href="/wiki/Analoog_signaal" title="Analoog signaal">Analoge</a> stroomlussen worden gebruikt wanneer een toestel op afstand bewaakt, gecontroleerd of aangestuurd moet worden over twee geleiders. Er kan maar één enkel stroomniveau op elk willekeurig ogenblik aanwezig zijn. </p><p>De levende nul bij 4 mA, in plaats van 0 mA, biedt het ontvangende toestel de mogelijkheid om onderscheid te maken tussen een nulsignaal en een gebroken draad of defect instrument. Deze standaard werd ontwikkeld rond 1950 en wordt nog steeds op grote schaal gebruikt in de industrie. Het grootste voordeel van de 4-20 mA is dat het signaal niet beïnvloed wordt door spanningsverliezen in de bedrading. Andere voordelen van de 4-20mA-standaard zijn dat zeer veel fabrikanten het ondersteunen, dat het meestal goedkoop te implementeren is en dat het ongevoelig is voor vele vormen van elektrische <a href="/wiki/Ruis_(signaal)" title="Ruis (signaal)">ruis</a>. De levende nul laat ook toe om met de 4 mA weinig stroom verbruikende sensoren te voeden vanuit de lus en zo te besparen op de kosten van extra draden. </p><p>Een stroomlus is ook veel eenvoudiger te begrijpen en te <i>debuggen</i> dan de veel gecompliceerdere <a href="/wiki/Digitaal" title="Digitaal">digitale</a> <a href="/wiki/Veldbus" title="Veldbus">veldbus</a>. Het gebruik van veldbus en het oplossen van de er aan gekoppelde problemen vereist veel meer opleiding en scholing dan de eenvoudiger stroomlus-oplossing. </p><p>Additionele digitale communicatie naar het toestel kan worden toegevoegd aan de stroom lus gebruikmakende van het <a href="/wiki/HART_(protocol)" title="HART (protocol)">HART-protocol</a>. Digitale proces bussen zoals foundation fieldbus en <a href="/wiki/Profibus" title="Profibus">profibus</a> of draadloze systemen (<a href="/w/index.php?title=Wireless_HART&action=edit&redlink=1" class="new" title="Wireless HART (de pagina bestaat niet)">Wireless HART</a>) kunnen op de lange termijn analoge stroomlussen vervangen. </p>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Overgenomen van "<a dir="ltr" href="https://nl.wikipedia.org/w/index.php?title=Stroomlus&oldid=63177765">https://nl.wikipedia.org/w/index.php?title=Stroomlus&oldid=63177765</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Categorie:Alles" title="Categorie:Alles">Categorie</a>: <ul><li><a href="/wiki/Categorie:Meettechniek" title="Categorie:Meettechniek">Meettechniek</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Deze pagina is voor het laatst bewerkt op 24 okt 2022 om 09:46.</li> <li id="footer-info-copyright">De tekst is beschikbaar onder de licentie <a rel="nofollow" class="external text" href="//creativecommons.org/licenses/by-sa/4.0/deed.nl">Creative Commons Naamsvermelding/Gelijk delen</a>, er kunnen aanvullende voorwaarden van toepassing zijn. 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