<\/div>\n
Architecture<\/h2>
Les manom\u00e8tres diff\u00e9rentiels utilisent deux entr\u00e9es de pression (+ et \u2212) reli\u00e9es \u00e0 un unique \u00e9l\u00e9ment sensible bidirectionnel : une membrane centrale qui se d\u00e9forme d’un c\u00f4t\u00e9 ou de l’autre selon la diff\u00e9rence, ou deux tubes de Bourdon oppos\u00e9s, ou deux cellules \u00e9lectroniques \u00e0 traitement diff\u00e9rentiel du signal. La pression diff\u00e9rentielle peut \u00eatre positive (+P > \u2212P), n\u00e9gative (+P < \u2212P) ou nulle. L’\u00e9tendue typique va de 0-25 Pa (pour les salles blanches \u00e0 haute sensibilit\u00e9) jusqu’\u00e0 0-100 bar (pour les filtres industriels haute pression), avec \u00e9galement des \u00e9chelles bidirectionnelles (-1000 \/ +1000 Pa pour le contr\u00f4le des flux). L’exactitude typique est de 0,5-2 % P.E. <\/p>
Salles blanches et environnements contr\u00f4l\u00e9s<\/h2>
L’une des applications les plus r\u00e9pandues est la surveillance de la mise en surpression des salles blanches et des environnements GMP pharmaceutiques : la pression int\u00e9rieure doit rester constamment positive (5-30 Pa au-dessus du milieu ext\u00e9rieur) afin d’emp\u00eacher l’entr\u00e9e de contaminants venant de l’ext\u00e9rieur (cascade de pression). Des manom\u00e8tres diff\u00e9rentiels analogiques \u00e0 cadran (type Magnehelic) ou num\u00e9riques sont install\u00e9s dans toutes les salles critiques et fournissent une lecture imm\u00e9diate. Les transmetteurs num\u00e9riques \u00e0 sortie 4-20 mA sont reli\u00e9s \u00e0 la GTB de l’\u00e9tablissement pour les alarmes et l’enregistrement automatique. La norme ISO 14644-3 et l’Annexe 1 des BPF europ\u00e9ennes en fixent les exigences. <\/p>
Surveillance des filtres<\/h2>
Une autre application importante est la surveillance du colmatage des filtres \u00e0 air, \u00e0 gaz et \u00e0 liquides : en mesurant la perte de charge \u00e0 travers le filtre, on d\u00e9termine le moment o\u00f9 celui-ci approche de la saturation et doit \u00eatre remplac\u00e9. Pour les filtres \u00e0 air, on utilise des manom\u00e8tres basse pression (0-500 Pa ou 0-1000 Pa) ; pour les filtres \u00e0 gaz industriels et hydrauliques, des manom\u00e8tres \u00e0 pression diff\u00e9rentielle \u00e9lev\u00e9e (0-1 bar typiquement). L’int\u00e9gration d’une alarme sonore ou d’un signal vers le syst\u00e8me de contr\u00f4le permet une gestion automatique de la maintenance. <\/p>
Mesure de d\u00e9bit avec sonde de Pitot<\/h2>
La mesure du d\u00e9bit d’air dans les gaines a\u00e9rauliques se r\u00e9alise souvent avec une sonde de Pitot (qui mesure la diff\u00e9rence entre la pression totale et la pression statique du flux, dont on d\u00e9duit la vitesse par la formule de Bernoulli) reli\u00e9e \u00e0 un manom\u00e8tre diff\u00e9rentiel basse pression (\u00e9tendue typique 0-1000 Pa). Les manom\u00e8tres diff\u00e9rentiels pour Pitot sont souvent int\u00e9gr\u00e9s directement dans les tubes de la sonde. Les applications comprennent l’\u00e9quilibrage d’installations de CVC, la v\u00e9rification du d\u00e9bit de hottes aspirantes, les essais de ventilateurs et le contr\u00f4le de cabines de peinture. <\/p>
Applications de niveau<\/h2>
Dans les r\u00e9servoirs sous pression ou \u00e9tanches, le niveau de liquide se mesure avec un manom\u00e8tre diff\u00e9rentiel : une prise de pression en fond de cuve, une prise sur le ciel pressuris\u00e9 ; la diff\u00e9rence est proportionnelle \u00e0 la hauteur de liquide selon h = \u0394P \/ (\u03c1\u00b7g). Cette application est r\u00e9pandue dans les r\u00e9servoirs de proc\u00e9d\u00e9 chimique, les autoclaves et les installations de distillation, o\u00f9 les capteurs de niveau traditionnels \u00e0 flotteur ou \u00e0 radar ne sont pas applicables. Les transmetteurs d\u00e9di\u00e9s disposent de cellules \u00e0 haute sensibilit\u00e9 (1-100 mbar) pour des mesures de niveau pr\u00e9cises dans des r\u00e9servoirs de faible hauteur. <\/p>
Normes et \u00e9talonnage<\/h2>
L’\u00e9talonnage des manom\u00e8tres diff\u00e9rentiels s’effectue avec des g\u00e9n\u00e9rateurs de pression diff\u00e9rentielle de classe \u00e9lev\u00e9e, en simulant simultan\u00e9ment les pressions + et \u2212 avec une exactitude meilleure que la classe du manom\u00e8tre en essai. Pour les \u00e9chelles de basse pression, on utilise des calibrateurs \u00e0 colonne d’eau ou \u00e0 huile dans des microman\u00e8tres. Les normes de r\u00e9f\u00e9rence sont l’ISO 4006 (terminologie et d\u00e9finitions de la pression diff\u00e9rentielle), l’EN 837 pour les manom\u00e8tres m\u00e9caniques, et les normes sectorielles (ISO 14644-3 pour les salles blanches, ISO 5167 pour la mesure de d\u00e9bit). <\/p>","protected":false},"excerpt":{"rendered":"
Manom\u00e8tres diff\u00e9rentiels pour la ventilation, les filtres, les salles blanches et les installations a\u00e9rauliques.<\/p>\n","protected":false},"author":157040980,"featured_media":0,"parent":19493,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"footnotes":""},"class_list":["post-22113","page","type-page","status-publish","hentry"],"yoast_head":"\n
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