{"id":12632,"date":"2025-10-06T08:00:10","date_gmt":"2025-10-06T06:00:10","guid":{"rendered":"https:\/\/blog.wika.com\/fr\/?p=12632"},"modified":"2025-10-02T14:11:42","modified_gmt":"2025-10-02T12:11:42","slug":"les-capillaires-dans-les-systemes-de-mesure-de-pression","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/fr\/general\/les-capillaires-dans-les-systemes-de-mesure-de-pression\/","title":{"rendered":"Tout savoir sur les capillaires dans les syst\u00e8mes de mesure de pression"},"content":{"rendered":"<p><strong>Les tubes capillaires, install\u00e9s entre un s\u00e9parateur \u00e0 membrane et un manom\u00e8tre ou un transmetteur de pression, permettent la surveillance \u00e0 distance tout en prot\u00e9geant l\u2019instrument des temp\u00e9ratures extr\u00eames. Une conception et une configuration adapt\u00e9es limitent les erreurs potentielles sur les lectures de pression.<\/strong><\/p>\n<h2>Principe et utilit\u00e9 du s\u00e9parateur \u00e0 membrane<\/h2>\n<p>Le <a href=\"https:\/\/www.wika.com\/fr-fr\/separateurs.WIKA\" rel=\"external\" target=\"_blank\">s\u00e9parateur \u00e0 membrane<\/a> isole le fluide de process de l\u2019instrument de mesure. Il prot\u00e8ge ainsi l\u2019appareil contre les milieux agressifs et <a href=\"https:\/\/blog.wika.com\/fr\/produits\/produits-pression\/rupture-de-membrane-de-separateur-comment-cela-peut-il-survenir\/\">\u00e9vite toute contamination<\/a>, notamment dans les applications hygi\u00e9niques.<\/p>\n<p>Dans la plupart des cas, l\u2019instrument est mont\u00e9 directement sur le s\u00e9parateur via un <a href=\"https:\/\/www.wika.com\/fr-fr\/accessoires_de_montage.WIKA\" rel=\"external\" target=\"_blank\">raccord filet\u00e9, \u00e0 bride ou sanitaire<\/a>. Cependant, certaines applications n\u00e9cessitent un tube capillaire (ou tube capillaire) pour relier les deux composants.<\/p>\n<h2>Avantages de l\u2019utilisation d\u2019un tube capillaire<\/h2>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/fr\/files\/2025\/10\/cap-line-blog-35-image-700x471-1-388x261.png\" \/><p class=\"wp-caption-text\">Exemple de montage : S\u00e9parateur \u00e0 membrane avec un tube capillaire et manom\u00e8tre avec kit de montage<\/p><\/div>\n    \n<ol>\n<li>Accessibilit\u00e9 accrue<\/li>\n<\/ol>\n<p>Lorsque le point de mesure est difficile d\u2019acc\u00e8s ou trop exigu, le capillaire rempli de liquide permet d\u2019installer l\u2019instrument \u00e0 distance. On parle alors de montage d\u00e9port\u00e9.<\/p>\n<ol start=\"2\">\n<li>Protection contre les temp\u00e9ratures extr\u00eames<\/li>\n<\/ol>\n<p>Les temp\u00e9ratures \u00e9lev\u00e9es figurent parmi les principales causes de <a href=\"https:\/\/blog.wika.com\/fr\/produits\/produits-pression\/les-8-raisons-courantes-de-defaillance-des-manometres\/\">d\u00e9faillance des manom\u00e8tres<\/a>. Le capillaire agit comme un dissipateur thermique. Plus il est long, plus il \u00e9vacue la chaleur avant que la pression n\u2019atteigne l\u2019instrument.<\/p>\n<p>Par exemple, un s\u00e9parateur mont\u00e9 en direct prot\u00e8ge l\u2019instrument jusqu\u2019\u00e0 150\u00b0C. Avec un \u00e9l\u00e9ment de refroidissement, la r\u00e9sistance monte \u00e0 260\u00b0C. En ajoutant un capillaire, l\u2019ensemble supporte jusqu\u2019\u00e0 400\u00b0C.<\/p>\n<p>\u00c0 noter : un kit ou support de fixation est n\u00e9cessaire, car l\u2019instrument ne sera pas autoportant.<\/p>\n<h2>3 points de vigilance lors de l\u2019utilisation d\u2019un capillaire<\/h2>\n<ol>\n<li>Temps de r\u00e9ponse<\/li>\n<\/ol>\n<p>Plus le capillaire est long, plus le temps de r\u00e9ponse augmente.<\/p>\n<ol start=\"2\">\n<li>Effet de gravit\u00e9<\/li>\n<\/ol>\n<p>Le s\u00e9parateur et l\u2019instrument sont souvent \u00e0 des hauteurs diff\u00e9rentes. Cette diff\u00e9rence cr\u00e9e des \u00e9carts de mesure (faux positifs ou n\u00e9gatifs). On peut toutefois compenser cet effet lors de l\u2019\u00e9talonnage.<\/p>\n<ol start=\"3\">\n<li>Effet de la temp\u00e9rature<\/li>\n<\/ol>\n<p>Les variations de temp\u00e9rature dilatent ou contractent le liquide de remplissage, g\u00e9n\u00e9rant des erreurs de mesure. Deux effets sont \u00e0 distinguer :<\/p>\n<ul>\n<li>Effet de la temp\u00e9rature sur le s\u00e9parateur : La mont\u00e9e en temp\u00e9rature dilate le liquide, cr\u00e9ant une surpression interne. Solution : Un s\u00e9parateur de plus grand diam\u00e8tre absorbe mieux cette pression suppl\u00e9mentaire.<\/li>\n<li>Effet de la temp\u00e9rature sur la t\u00eate de mesure : L\u2019augmentation de la temp\u00e9rature ambiante rend le liquide moins dense. Si l\u2019instrument est plus haut que le s\u00e9parateur, la gravit\u00e9 accentue la baisse de pression mesur\u00e9e. \u00c0 l\u2019inverse, s\u2019il est plus bas, la pression mesur\u00e9e augmente. Solution : Un capillaire \u00e0 faible diam\u00e8tre interne r\u00e9duit cet effet, mais augmente la friction et donc le temps de r\u00e9ponse.<\/li>\n<\/ul>\n<p>Une configuration adapt\u00e9e du syst\u00e8me \u00e0 s\u00e9parateur minimise, voire \u00e9limine, ces erreurs.<\/p>\n<h2>Expertise WIKA dans la mesure de pression<\/h2>\n<p>WIKA dispose d\u2019un savoir-faire reconnu pour concevoir, installer et \u00e9talonner des montages sur s\u00e9parateur pour l\u2019industrie, de <a href=\"https:\/\/www.wika.com\/fr-fr\/industrie_du_petrole_et_du_gaz_up_mid_et_downstream.WIKA\" rel=\"external\" target=\"_blank\">l\u2019oil &amp; gas<\/a> \u00e0 <a href=\"https:\/\/www.wika.com\/fr-fr\/agroalimentaire.WIKA\" rel=\"external\" target=\"_blank\">l\u2019agroalimentaire<\/a>. Nos sp\u00e9cialistes accompagnent chaque client pour d\u00e9velopper des solutions sur mesure, garantissant pr\u00e9cision et r\u00e9activit\u00e9.<\/p>\n<p><a href=\"https:\/\/www.wika.com\/fr-fr\/contact.WIKA\" rel=\"external\" target=\"_blank\">Contactez-nous<\/a> pour toute demande sur nos produits, services ou garanties li\u00e9s aux s\u00e9parateurs \u00e0 membrane.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les tubes capillaires, install\u00e9s entre un s\u00e9parateur \u00e0 membrane et un manom\u00e8tre ou un transmetteur de pression, permettent la surveillance \u00e0 distance tout en prot\u00e9geant l\u2019instrument des temp\u00e9ratures extr\u00eames. Une conception et une configuration adapt\u00e9es limitent les erreurs potentielles sur les lectures de pression. Principe et utilit\u00e9 du s\u00e9parateur \u00e0 membrane Le s\u00e9parateur \u00e0 membrane [&hellip;]<\/p>\n","protected":false},"author":164,"featured_media":12631,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,5],"tags":[],"class_list":["post-12632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-savoir-faire"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Les capillaires dans la mesure de pression - Blog WIKA<\/title>\n<meta name=\"description\" content=\"Les capillaires, permettent la surveillance \u00e0 distance et prot\u00e8gent l\u2019instrument de pression des temp\u00e9ratures extr\u00eames\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wika.com\/fr\/general\/les-capillaires-dans-les-systemes-de-mesure-de-pression\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les capillaires dans la mesure de pression - 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