{"id":20959,"date":"2026-02-17T14:14:20","date_gmt":"2026-02-17T13:14:20","guid":{"rendered":"https:\/\/gasmix.com\/purete-du-combustible-hydrogene-comment-etalonner-les-analyseurs-de-gaz-a-letat-de-traces-iso-14687\/"},"modified":"2026-09-09T14:13:31","modified_gmt":"2026-09-09T12:13:31","slug":"purete-hydrogen","status":"publish","type":"post","link":"https:\/\/gasmix.com\/fr\/purete-hydrogen\/","title":{"rendered":"Puret\u00e9 de l&rsquo;hydrog\u00e8ne carburant : comment \u00e9talonner les analyseurs de gaz au niveau des traces (ISO 14687)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"20959\" class=\"elementor elementor-20959 elementor-18737\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5f3bec6 e-flex e-con-boxed e-con e-parent\" data-id=\"5f3bec6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4fa7458 elementor-widget__width-inherit elementor-widget elementor-widget-html\" data-id=\"4fa7458\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\r\n\r\n<article class=\"nx\">\r\n\r\n  <h1 style=\"font-size:2.4em;line-height:1.15;margin:0 0 .55em;color:#0f172a;font-weight:600;letter-spacing:-0.02em\">\u00c9talonnage pour la puret\u00e9 de l'hydrog\u00e8ne (ISO &nbsp;14687)<\/h1>\r\n  <p style=\"font-size:1.15em;color:#5b6675;margin:-0.2em 0 1.2em\">Comment \u00e9talonner les analyseurs d'impuret\u00e9s de l'hydrog\u00e8ne au niveau des traces, \u00e0 la demande et de fa\u00e7on tra\u00e7able.<\/p>\r\n\r\n  <div class=\"nx-answer\">\r\n    <p style=\"margin:0\"><strong>L'ISO &nbsp;14687 fixe des seuils d'impuret\u00e9s pour l'hydrog\u00e8ne destin\u00e9 aux piles \u00e0 combustible qui descendent jusqu'au ppb \u2014 un domaine o\u00f9 la difficult\u00e9 ne vient plus de l'analyseur, mais de l'\u00e9talon.<\/strong> Les bouteilles commerciales \u00e0 l'\u00e9tat de traces sont co\u00fbteuses, longues \u00e0 obtenir, de courte dur\u00e9e de vie, et affichent une incertitude certifi\u00e9e de 10 \u00e0 20&nbsp; %. La dilution dynamique (ISO&nbsp;6145-7) r\u00e9sout le probl\u00e8me : \u00e0 partir d'un seul \u00e9talon m\u00e8re stable et concentr\u00e9, un diluteur GasMix g\u00e9n\u00e8re \u00e0 la demande n'importe quelle concentration d'impuret\u00e9, avec calcul automatique de l'incertitude et tra\u00e7abilit\u00e9 documentaire. Deux notes d'application ind\u00e9pendantes le d\u00e9montrent : compos\u00e9s soufr\u00e9s et ammoniac au niveau du ppb unitaire sur un d\u00e9tecteur PAC SeNSe2, et impuret\u00e9s en gaz permanents satisfaisant aux limites de d\u00e9tection de l'ISO&nbsp; 14687 sur un analyseur d'hydrog\u00e8ne Da Vinci DVLS.  <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"nx-kpis\">\r\n    <div class=\"nx-kpi\"><b>Niveau ppb<\/b><span>compos\u00e9s soufr\u00e9s et NH<sub>\u2083<\/sub> g\u00e9n\u00e9r\u00e9s et quantifi\u00e9s (note PAC)<\/span><\/div>\r\n    <div class=\"nx-kpi\"> <b>&lt;&lt;5 &nbsp;% RSD<\/b><span>r\u00e9p\u00e9tabilit\u00e9 sur les impuret\u00e9s de l'H<sub>\u2082 <\/sub>(note DVLS)<\/span><\/div>\r\n    <div class=\"nx-kpi\"><b>ISO&nbsp; 14687<\/b><span>limites de d\u00e9tection atteintes pour les gaz permanents<\/span><\/div>\r\n    <div class=\"nx-kpi\"><b>ISO&nbsp; 6145-7<\/b><span>dilution dynamique, raccordement NIST, tra\u00e7abilit\u00e9 documentaire<\/span><\/div>\r\n  <\/div>\r\n\r\n  <p style=\"text-align:center\">\r\n    <a class=\"nx-btn nx-btn--outline\" href=\"https:\/\/gasmix.com\/fr\/generation-de-gaz-a-letat-de-traces\/\">Pour aller plus loin \u2192 G\u00e9n\u00e9ration de gaz \u00e0 l'\u00e9tat de traces<\/a>\r\n  <\/p>\r\n\r\n  <h2>Pourquoi les seuils de puret\u00e9 de l'hydrog\u00e8ne carburant sont-ils si bas ?<\/h2>\r\n\r\n  <p>Une pile \u00e0 combustible doit tenir environ 200 000 &nbsp;km (125 000 &nbsp;miles) sans intervention lourde. Les impuret\u00e9s pr\u00e9sentes dans l'hydrog\u00e8ne se d\u00e9posent sur le catalyseur et r\u00e9duisent son activit\u00e9 de fa\u00e7on cumulative sur toute cette dur\u00e9e de vie. Pour \u00e9tablir les seuils, les ing\u00e9nieurs calculent la masse maximale tol\u00e9rable de chaque contaminant sur la vie du v\u00e9hicule, puis la divisent par la quantit\u00e9 totale d'hydrog\u00e8ne consomm\u00e9e. Le r\u00e9sultat, inscrit dans l'ISO &nbsp;14687 pour les piles \u00e0 combustible PEM, est un jeu de valeurs limites situ\u00e9es entre le ppb et le bas de la gamme ppm, certaines sous le ppb.   <\/p>\r\n\r\n  <p>Cela pose deux probl\u00e8mes au chimiste analyste : trouver un analyseur capable de d\u00e9tecter les impuret\u00e9s \u00e0 ces niveaux et, plus difficile encore, se procurer des gaz d'\u00e9talonnage fiables et tra\u00e7ables aux m\u00eames concentrations.<\/p>\r\n\r\n  <h2>Les limites des \u00e9talons certifi\u00e9s du commerce<\/h2>\r\n\r\n  <ul class=\"nx-list\">\r\n    <li><strong>D\u00e9lais d'approvisionnement longs et variables<\/strong>, de plusieurs semaines.<\/li>\r\n    <li><strong>Dur\u00e9e de conservation courte<\/strong>, parfois r\u00e9duite \u00e0 3 mois pour les compos\u00e9s r\u00e9actifs \u00e0 l'\u00e9tat de traces.<\/li>\r\n    <li><strong>Incertitude certifi\u00e9e \u00e9lev\u00e9e<\/strong>, de 10 \u00e0 20&nbsp;%, qui se propage directement dans votre incertitude de mesure.<\/li>\r\n    <li><strong>Co\u00fbt tr\u00e8s \u00e9lev\u00e9<\/strong>, d'autant plus important que la concentration vis\u00e9e est basse.<\/li>\r\n    <li><strong>Concentration inadapt\u00e9e<\/strong>, souvent d'un \u00e0 deux ordres de grandeur au-dessus ou au-dessous de la cible, ce qui impose une dilution manuelle suppl\u00e9mentaire.<\/li>\r\n  <\/ul>\r\n\r\n  <h2>La solution du diluteur de gaz : n'importe quelle concentration, \u00e0 la demande<\/h2>\r\n\r\n  <p>La dilution dynamique selon l'ISO&nbsp; 6145-7 part d'un \u00e9talon m\u00e8re unique, concentr\u00e9 et certifi\u00e9 : un \u00e9talon stable, comparativement peu co\u00fbteux, certifi\u00e9 jusqu'\u00e0 cinq ans et assorti d'une incertitude resserr\u00e9e. Un diluteur <a href=\"https:\/\/gasmix.com\/fr\/produits\/zephyr-ii\/\">ZEPHYR&nbsp; II<\/a> ou <a href=\"https:\/\/gasmix.com\/fr\/produits\/aiolos-iii\/\">AIOLOS &nbsp;III<\/a> produit ensuite, \u00e0 la demande, n'importe quelle concentration comprise entre l'\u00e9talon m\u00e8re et le gaz de dilution, avec une tra\u00e7abilit\u00e9 document\u00e9e. <\/p>\r\n\r\n  <figure class=\"nx-fig\">\r\n    \r\n      \r\n      \r\n      Parent\r\n      standard\r\n      stable, certified\r\n      \r\n      GasMix\r\n      dynamic dilution\r\n      ISO 6145-7\r\n      + dilution gas\r\n      \r\n      ppb standard\r\n      any concentration,\r\n      on demand\r\n      \r\n      H\u2082 impurity\r\n      analyser\r\n      GC \/ SCD \/ NCD\r\n      \r\n      \r\n      \r\n    \r\n    <figcaption>Un seul \u00e9talon m\u00e8re concentr\u00e9 et certifi\u00e9 devient une s\u00e9rie illimit\u00e9e d'\u00e9talons d'impuret\u00e9s au niveau du ppb, g\u00e9n\u00e9r\u00e9s \u00e0 la demande et envoy\u00e9s vers l'analyseur d'impuret\u00e9s de l'hydrog\u00e8ne.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <ul class=\"nx-ben\">\r\n    <li>\r\n      <span class=\"ic\"><\/span>\r\n      <div><b>Concentration cible exacte <\/b><span>G\u00e9n\u00e9rez le niveau dont vous avez besoin et encadrez vos \u00e9chantillons inconnus, au lieu de vous contenter d'une valeur de catalogue.<\/span><\/div>\r\n    <\/li>\r\n    <li>\r\n      <span class=\"ic\"><\/span>\r\n      <div><b>Moins de bouteilles <\/b><span>Un seul \u00e9talon m\u00e8re remplace toute une r\u00e9serve de bouteilles certifi\u00e9es \u00e0 l'\u00e9tat de traces : moins de stock, une logistique simplifi\u00e9e, une meilleure s\u00e9curit\u00e9.<\/span><\/div>\r\n    <\/li>\r\n    <li>\r\n      <span class=\"ic\"><\/span>\r\n      <div><b>Tra\u00e7abilit\u00e9 compl\u00e8te<\/b> <span>Tra\u00e7abilit\u00e9 documentaire, calcul automatique de l'incertitude et rapport PDF pour chaque m\u00e9lange.<\/span><\/div>\r\n    <\/li>\r\n    <li>\r\n      <span class=\"ic\"><\/span>\r\n      <div><b>Compos\u00e9s agressifs<\/b> <span>Compatible avec les esp\u00e8ces r\u00e9actives : compos\u00e9s soufr\u00e9s, NO<sub>x<\/sub>, NH<sub>\u2083<\/sub> et COV.<\/span><\/div>\r\n    <\/li>\r\n  <\/ul>\r\n\r\n  <div class=\"nx-cta nx-cta--primary\">\r\n    <h3>\u00c9talonnez votre analyseur d'hydrog\u00e8ne au niveau du ppb<\/h3>\r\n    <p>Indiquez-nous les impuret\u00e9s vis\u00e9es, les limites ISO&nbsp; 14687 applicables et votre analyseur : nous confirmons la configuration du diluteur et l'incertitude attendue.<\/p>\r\n    <a class=\"nx-btn nx-btn--primary\" href=\"https:\/\/gasmix.com\/fr\/nous-contacter\/\">Demander un devis<\/a>\r\n<a class=\"nx-btn nx-btn--onpurple\" href=\"https:\/\/gasmix.com\/fr\/?page_id=22203\">Lancer le s\u00e9lecteur de produit<\/a>\r\n  <\/div>\r\n\r\n  <h2>Limites d'impuret\u00e9s de l'ISO &nbsp;14687 et performances attendues d'un analyseur<\/h2>\r\n\r\n  <p>Les impuret\u00e9s en gaz permanents ci-dessous ont \u00e9t\u00e9 mesur\u00e9es sur un analyseur d'hydrog\u00e8ne Da Vinci DVLS \u00e9talonn\u00e9 avec un \u00e9talon AlyTech Gas&nbsp; Mix. Les limites de d\u00e9tection se situent confortablement en dessous de la sp\u00e9cification ISO&nbsp; 14687 pour chaque compos\u00e9. <\/p>\r\n\r\n  <div class=\"nx-tw\">\r\n    <table class=\"nx-t\">\r\n      <thead><tr><th>Impuret\u00e9<\/th><br \/><th>Limite ISO &nbsp;14687 (\u00b5mol\/mol)<\/th><br \/><th>Limite de d\u00e9tection (\u00b5mol\/mol)<\/th><\/tr><\/thead>\r\n      <tbody>\r\n        <tr><td>Argon<\/td><td>300<\/td><td class=\"win\">&lt; 0.1<\/td><\/tr>\r\n        <tr><td>Oxyg\u00e8ne<\/td><td>5<\/td><td class=\"win\">&lt; 0.1<\/td><\/tr>\r\n        <tr><td>Azote<\/td><td>300<\/td><td class=\"win\">&lt; 0.1<\/td><\/tr>\r\n        <tr><td>Monoxyde de carbone<\/td><td>0.2<\/td><td class=\"win\">0.1<\/td><\/tr>\r\n        <tr><td>M\u00e9thane<\/td><td>100<\/td><td class=\"win\">&lt; 1<\/td><\/tr>\r\n        <tr><td>Dioxyde de carbone<\/td><td>2<\/td><td class=\"win\">&lt; 1<\/td><\/tr>\r\n        <tr><td>Hydrocarbures lourds<\/td><td>2<\/td><td class=\"win\">&lt; 1<\/td><\/tr>\r\n        <tr><td>H\u00e9lium<\/td><td>300<\/td><td class=\"win\">&lt; 50<\/td><\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2>R\u00e9sultats d\u00e9montr\u00e9s : deux notes d'application<\/h2>\r\n\r\n  <h3>Compos\u00e9s soufr\u00e9s et ammoniac au niveau du ppb unitaire (PAC SeNSe2)<\/h3>\r\n\r\n  <p>Dans une note conjointe PAC et AlyTech, un GasMix a g\u00e9n\u00e9r\u00e9 des niveaux d'\u00e9talonnage tra\u00e7ables pour un d\u00e9tecteur par chimiluminescence soufre\/azote PAC SeNSe2. Les esp\u00e8ces soufr\u00e9es ont \u00e9t\u00e9 quantifi\u00e9es au niveau du ppb unitaire et l'ammoniac sous 100 &nbsp;ppb, avec une r\u00e9ponse stable, lin\u00e9aire et \u00e9quimolaire : <\/p>\r\n\r\n  <div class=\"nx-tw\">\r\n    <table class=\"nx-t\">\r\n      <thead><tr><th>Component<\/th><th>Mean<\/th><th>Target<\/th><th>Bias<\/th><th>RSD<\/th><\/tr><\/thead>\r\n      <tbody>\r\n        <tr><td>H<sub>2<\/sub>S<\/td><td>3.76&nbsp;ppb<\/td><td>3.59&nbsp;ppb<\/td><td>+4.71&nbsp;%<\/td><td>3.2&nbsp;%<\/td><\/tr>\r\n        <tr><td>COS<\/td><td>4.14&nbsp;ppb<\/td><td>4.00&nbsp;ppb<\/td><td>+3.62&nbsp;%<\/td><td>2.9&nbsp;%<\/td><\/tr>\r\n        <tr><td>SO<sub>2<\/sub><\/td><td>4.11&nbsp;ppb<\/td><td>4.00&nbsp;ppb<\/td><td>+2.87&nbsp;%<\/td><td>3.4&nbsp;%<\/td><\/tr>\r\n        <tr><td>NH<sub>3<\/sub><\/td><td>96.30&nbsp;ppb<\/td><td>100.00&nbsp;ppb<\/td><td>\u22123.70&nbsp;%<\/td><td>7.1&nbsp;%<\/td><\/tr>\r\n        <tr><td>Soufre total<\/td><td>12.02&nbsp;ppb<\/td><td>11.59&nbsp;ppb<\/td><td>+3.70&nbsp;%<\/td><td class=\"win\">1.0&nbsp;%<\/td><\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"nx-src\">\r\n    <b>R\u00e9f\u00e9rence : <\/b>\u00ab How the GasMix\u2122 Enhances Ultra-Low-Level Sulfur and Ammonia Analysis with the PAC SeNSe2 Detector \u00bb, T. &nbsp;Boekee (PAC) et L. &nbsp;Courthaudon (AlyTech). <a href=\"https:\/\/gasmix.com\/wp-content\/uploads\/2026\/04\/PAC_SenSe_x_GasMix_right-version-final.pdf\">Lire la note d'application (PDF).<\/a>\r\n  <\/div>\r\n\r\n  <h3>Impuret\u00e9s en gaz permanents sur un analyseur d'hydrog\u00e8ne (Da Vinci DVLS)<\/h3>\r\n\r\n  <p>Dans une note de Da Vinci Laboratory Solutions, un analyseur d'hydrog\u00e8ne DVLS (PDHID, FID et TCD r\u00e9partis sur trois voies) a \u00e9t\u00e9 \u00e9talonn\u00e9 avec un &nbsp;GasMix Alytech. Sur 12 r\u00e9p\u00e9titions, la r\u00e9p\u00e9tabilit\u00e9 est rest\u00e9e nettement sous les 5 &nbsp;% de RSD pour chaque impuret\u00e9 : <\/p>\r\n\r\n  <div class=\"nx-tw\">\r\n    <table class=\"nx-t\">\r\n      <thead><tr><th>Impuret\u00e9<\/th><th>Moyenne<\/th><th>RSD (n = 12)<\/th><\/tr><\/thead>\r\n      <tbody>\r\n        <tr><td>Dioxyde de carbone<\/td><td>10.2<\/td><td class=\"win\">0.13&nbsp;%<\/td><\/tr>\r\n        <tr><td>M\u00e9thane<\/td><td>10.1<\/td><td class=\"win\">0.26&nbsp;%<\/td><\/tr>\r\n        <tr><td>Hydrocarbures lourds<\/td><td>10.0<\/td><td class=\"win\">0.25&nbsp;%<\/td><\/tr>\r\n        <tr><td>Dioxyde de carbone<\/td><td>10.1<\/td><td class=\"win\">0.31&nbsp;%<\/td><\/tr>\r\n        <tr><td>Argon<\/td><td>102<\/td><td>0.94&nbsp;%<\/td><\/tr>\r\n        <tr><td>Oxyg\u00e8ne<\/td><td>10.4<\/td><td>2.30&nbsp;%<\/td><\/tr>\r\n        <tr><td>Azote<\/td><td>109<\/td><td>2.48&nbsp;%<\/td><\/tr>\r\n        <tr><td>H\u00e9lium<\/td><td>94.9<\/td><td>3.58&nbsp;%<\/td><\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>La r\u00e9solution chromatographique s'est \u00e9tablie \u00e0 2,0 pour le couple argon\/oxyg\u00e8ne et \u00e0 3,4 pour le couple h\u00e9lium\/hydrog\u00e8ne, pour un temps d'analyse d'environ 20&nbsp; minutes.<\/p>\r\n\r\n  <div class=\"nx-src\">\r\n    R\u00e9f\u00e9rence : \u00ab The Analysis of Impurities in Hydrogen Fuel Using the DVLS Hydrogen Analyzer \u00bb, B. &nbsp;de&nbsp; Jonge, Da Vinci Laboratory Solutions. <a href=\"https:\/\/gasmix.com\/wp-content\/uploads\/2025\/11\/DVLS-The-analysis-of-impurities-in-hydrogen-fuel-application-note-DVE.75.01-1.pdf\">Lire la note d'application (PDF).<\/a>\r\n  <\/div>\r\n\r\n  <div class=\"nx-quote\">Deux fabricants d'instruments ind\u00e9pendants, une m\u00eame approche d'\u00e9talonnage : \u00e0 partir d'un unique \u00e9talon m\u00e8re certifi\u00e9, la dilution dynamique GasMix fournit l'\u00e9talonnage tra\u00e7able au niveau du ppb qu'exige l'analyse de l'hydrog\u00e8ne selon l'ISO &nbsp;14687.<\/div>\r\n\r\n  <h2>Bouteilles du commerce ou dilution dynamique pour l'ISO&nbsp; 14687<\/h2>\r\n\r\n  <div class=\"nx-tw\">\r\n    <table class=\"nx-t\">\r\n      <thead><tr><th>Crit\u00e8re<\/th><th>Bouteilles du commerce \u00e0 l'\u00e9tat de traces<\/th><th>Dilution dynamique (GasMix)<\/th><\/tr><\/thead>\r\n      <tbody>\r\n        <tr><td>D\u00e9lai d'obtention<\/td><td>Plusieurs semaines<\/td><td class=\"win\">\u00c0 la demande, sur site<\/td><\/tr>\r\n        <tr><td>Dur\u00e9e de conservation<\/td><td>Parfois r\u00e9duite \u00e0 3 mois (esp\u00e8ces r\u00e9actives)<\/td><td class=\"win\">\u00c9talon m\u00e8re certifi\u00e9 jusqu'\u00e0 5 ans<\/td><\/tr>\r\n        <tr><td>Incertitude certifi\u00e9e<\/td><td>10 \u00e0 20<\/td> &nbsp;%<td class=\"win\">Resserr\u00e9e, propag\u00e9e et report\u00e9e pour chaque m\u00e9lange<\/td><\/tr>\r\n        <tr><td>Concentration<\/td><td>Fig\u00e9e, souvent \u00e9loign\u00e9e de la cible<\/td><td class=\"win\">Tout niveau entre l'\u00e9talon m\u00e8re et le gaz de dilution<\/td><\/tr>\r\n        <tr><td>Co\u00fbt \u00e0 l'\u00e9tat de traces<\/td><td>Tr\u00e8s \u00e9lev\u00e9, cro\u00eet quand le niveau baisse<\/td><td class=\"win\">Un \u00e9talon m\u00e8re, de nombreux niveaux<\/td><\/tr>\r\n        <tr><td>Compos\u00e9s r\u00e9actifs (S, NO<sub>x<\/sub>, NH\u2083)<\/td><td>Difficiles \u00e0 certifier et \u00e0 maintenir stables<\/td><td class=\"win\">G\u00e9n\u00e9r\u00e9s \u00e0 l'instant, circuit \u00e0 traitement inerte<\/td><\/tr>\r\n        <tr><td>Tra\u00e7abilit\u00e9<\/td><br \/><td>Certificat du fournisseur<\/td><br \/><td class=\"win\">Tra\u00e7abilit\u00e9 documentaire, incertitude automatique, rapport PDF<\/td><\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2>Quel syst\u00e8me GasMix pour les travaux sur la puret\u00e9 de l'hydrog\u00e8ne ?<\/h2>\r\n\r\n  <p>Pour une dilution compacte \u00e0 deux gaz : <a href=\"https:\/\/gasmix.com\/fr\/produits\/zephyr-ii\/\">ZEPHYR &nbsp;II<\/a>. Pour la dilution multigaz automatis\u00e9e et les s\u00e9quences multipoints \u2014 le choix naturel pour couvrir l'ensemble du panel d'impuret\u00e9s de l'ISO &nbsp;14687 : <a href=\"https:\/\/gasmix.com\/fr\/produits\/aiolos-iii\/\">AIOLOS&nbsp; III<\/a>. Pour les m\u00e9langes complexes jusqu'\u00e0 16 voies et plus : <a href=\"https:\/\/gasmix.com\/fr\/produits\/hurricane\/\">HURRICANE<\/a>. La m\u00eame m\u00e9thode est au c\u0153ur de la<a href=\"https:\/\/gasmix.com\/fr\/generation-de-gaz-a-letat-de-traces\/\"> g\u00e9n\u00e9ration de gaz \u00e0 l'\u00e9tat de traces<\/a> et de l'<a href=\"https:\/\/gasmix.com\/fr\/?page_id=22330\">\u00e9talonnage multipoint automatis\u00e9<\/a>. Vous h\u00e9sitez pour votre analyseur ? L'article <a href=\"https:\/\/gasmix.com\/how-to-choose-the-right-gas-mixer-for-your-laboratory\/\">Bien choisir son m\u00e9langeur de gaz<\/a> d\u00e9taille la d\u00e9marche, et <a href=\"https:\/\/gasmix.com\/fr\/?page_id=22203\">le s\u00e9lecteur de produit <\/a>vous propose une configuration.  <\/p>\r\n\r\n  <h2>Questions fr\u00e9quentes<\/h2>\r\n\r\n  <div class=\"gm-faq\">\r\n    <details>\r\n      <summary>Pourquoi les seuils d'impuret\u00e9s de l'ISO &nbsp;14687 pour l'hydrog\u00e8ne se situent-ils au niveau du ppb ?<span class=\"gm-chev\"><\/span><\/summary>\r\n      <div class=\"gm-faq-body\"><p>Parce que les impuret\u00e9s empoisonnent le catalyseur de la pile \u00e0 combustible de fa\u00e7on cumulative sur toute la vie du v\u00e9hicule (environ 200&nbsp; 000 km). L'ISO&nbsp; 14687 d\u00e9termine la masse maximale tol\u00e9rable de chaque contaminant sur cette dur\u00e9e de vie et la divise par la consommation totale d'hydrog\u00e8ne, ce qui situe les seuils entre le ppb et le bas de la gamme ppm, certains sous le ppb. <\/p><\/div>\r\n    <\/details>\r\n    <details>\r\n      <summary>Pourquoi ne pas simplement acheter des bouteilles certifi\u00e9es \u00e0 l'\u00e9tat de traces ?<span class=\"gm-chev\"><\/span><\/summary>\r\n      <div class=\"gm-faq-body\"><p>\u00c0 ces niveaux, elles pr\u00e9sentent des d\u00e9lais longs (plusieurs semaines), une dur\u00e9e de conservation courte (parfois 3 mois pour les esp\u00e8ces r\u00e9actives), une incertitude certifi\u00e9e \u00e9lev\u00e9e (10 \u00e0 20&nbsp; %), un co\u00fbt important, et souvent une concentration inadapt\u00e9e. La dilution dynamique g\u00e9n\u00e8re \u00e0 la demande le niveau exact dont vous avez besoin, \u00e0 partir d'un seul \u00e9talon m\u00e8re stable. <\/p><\/div>\r\n    <\/details>\r\n    <details>\r\n      <summary>Quelle exactitude et quelle r\u00e9p\u00e9tabilit\u00e9 obtient-on avec un \u00e9talonnage par dilution ?<span class=\"gm-chev\"><\/span><\/summary>\r\n      <div class=\"gm-faq-body\"><p>Dans la note PAC SeNSe2, les esp\u00e8ces soufr\u00e9es \u00e0 environ 4&nbsp; ppb ont montr\u00e9 un biais de 2,9 \u00e0 4,7 &nbsp;% et un RSD de 2,9 \u00e0 3,4 &nbsp;% ; l'ammoniac \u00e0 ~96&nbsp; ppb a donn\u00e9 7,1 &nbsp;% de RSD, et le soufre total 1,0 &nbsp;%. Dans la note DVLS, les impuret\u00e9s en gaz permanents sont rest\u00e9es sous 5&nbsp; % de RSD sur 12 r\u00e9p\u00e9titions (de 0,13 \u00e0 3,58&nbsp; %). Les r\u00e9sultats d\u00e9pendent de l'analyseur et du compos\u00e9.  <\/p><\/div>\r\n    <\/details>\r\n    <details>\r\n      <summary>Peut-on g\u00e9n\u00e9rer des impuret\u00e9s agressives comme l'H\u2082S et le NH\u2083 ?<span class=\"gm-chev\"><\/span><\/summary>\r\n      <div class=\"gm-faq-body\"><p>Oui. Les diluteurs sont compatibles avec les compos\u00e9s agressifs (esp\u00e8ces soufr\u00e9es, NO<sub>x<\/sub>, ammoniac, COV) gr\u00e2ce \u00e0 des circuits gazeux \u00e0 traitement inerte, et les g\u00e9n\u00e8rent \u00e0 l'instant, au point d'utilisation \u2014 ce qui \u00e9vite la d\u00e9rive et l'adsorption dont souffrent les bouteilles d'esp\u00e8ces r\u00e9actives. <\/p><\/div>\r\n    <\/details>\r\n    <details>\r\n      <summary>L'\u00e9talonnage est-il tra\u00e7able et conforme aux normes ISO ?<span class=\"gm-chev\"><\/span><\/summary>\r\n      <div class=\"gm-faq-body\"><p>La g\u00e9n\u00e9ration suit la m\u00e9thode de dilution dynamique ISO&nbsp; 6145-7 ; l'\u00e9talon m\u00e8re est certifi\u00e9 et raccord\u00e9 au NIST ; et chaque m\u00e9lange est accompagn\u00e9 d'un calcul automatique d'incertitude, d'une tra\u00e7abilit\u00e9 documentaire et d'un rapport PDF. L'ensemble permet d'\u00e9talonner au regard des limites d'impuret\u00e9s de l'ISO&nbsp; 14687. <\/p><\/div>\r\n    <\/details>\r\n    <details>\r\n      <summary>Avec quels analyseurs la m\u00e9thode a-t-elle \u00e9t\u00e9 d\u00e9montr\u00e9e ?<span class=\"gm-chev\"><\/span><\/summary>\r\n      <div class=\"gm-faq-body\"><p>Deux notes publi\u00e9es : un d\u00e9tecteur par chimiluminescence soufre\/azote PAC SeNSe2 (compos\u00e9s soufr\u00e9s et ammoniac au niveau du ppb) et un analyseur d'hydrog\u00e8ne Da Vinci DVLS \u00e9quip\u00e9 de PDHID, FID et TCD (impuret\u00e9s en gaz permanents au regard de l'ISO 14687). L'approche de dilution, g\u00e9n\u00e9rique, s'applique \u00e9galement \u00e0 d'autres analyseurs d'impuret\u00e9s de l'hydrog\u00e8ne. <\/p><\/div>\r\n    <\/details>\r\n  <\/div>\r\n\r\n  <div class=\"nx-cta nx-cta--soft\" style=\"margin-top:2em\">\r\n    <h3>Internalisez votre \u00e9talonnage ISO&nbsp; 14687<\/h3>\r\n    <p>Plus de 25 ans d'exp\u00e9rience dans la sp\u00e9cification de syst\u00e8mes de dilution de gaz. Indiquez-nous votre panel d'impuret\u00e9s et votre analyseur : nous d\u00e9finirons le GasMix adapt\u00e9. Vous pouvez aussi commencer par le s\u00e9lecteur de produit. <\/p>\r\n    <a class=\"nx-btn nx-btn--solid\" href=\"https:\/\/gasmix.com\/fr\/nous-contacter\/\">Demander un devis<\/a>\r\n    <a class=\"nx-btn nx-btn--outline\" href=\"https:\/\/gasmix.com\/fr\/?page_id=22203\">Lancer le s\u00e9lecteur de produit<\/a>\r\n    <p style=\"margin-top:.8em;font-size:.92em\">Ou \u00e9crivez-nous \u00e0 <a href=\"mailto:gasmix@alytech.fr\">gasmix@alytech.fr<\/a>.<\/p>\r\n  <\/div>\r\n\r\n  <p style=\"font-size:.9em;color:#6b7280;margin-top:2em\">R\u00e9f\u00e9rences : note d'application PAC SeNSe2 \u00d7 GasMix (Boekee, Courthaudon) ; note d'application sur l'analyseur d'hydrog\u00e8ne Da Vinci DVLS (de Jonge). Les valeurs cit\u00e9es sont issues de ces notes et d\u00e9pendent de l'analyseur et du compos\u00e9. Normes : ISO&nbsp; 14687, ISO&nbsp; 6145-7. Les noms de marques d'instruments sont la propri\u00e9t\u00e9 de leurs d\u00e9tenteurs respectifs ; l'interop\u00e9rabilit\u00e9 est d\u00e9crite sans que cela implique un quelconque partenariat. GasMix, AlyTech.    <\/p>\r\n\r\n<\/article>\r\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>\u00c9talonnage pour la puret\u00e9 de l&rsquo;hydrog\u00e8ne (ISO &nbsp;14687) Comment \u00e9talonner les analyseurs d&rsquo;impuret\u00e9s de l&rsquo;hydrog\u00e8ne au niveau des traces, \u00e0 la demande et de fa\u00e7on tra\u00e7able. L&rsquo;ISO &nbsp;14687 fixe des seuils d&rsquo;impuret\u00e9s pour l&rsquo;hydrog\u00e8ne destin\u00e9 aux piles \u00e0 combustible qui descendent jusqu&rsquo;au ppb \u2014 un domaine o\u00f9 la difficult\u00e9 ne vient plus de l&rsquo;analyseur, mais [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":20359,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[294],"tags":[],"class_list":["post-20959","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-en-vedette"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Hydrog\u00e8ne : Comprendre les limites de puret\u00e9 et d&#039;impuret\u00e9 &#8212; 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