<\/div>\n
Capteurs de pression<\/h2>
Les capteurs de pression utilis\u00e9s sont principalement pi\u00e9zor\u00e9sistifs (variation de r\u00e9sistance de membranes en silicium dop\u00e9) et capacitifs (variation de capacit\u00e9 entre la membrane et une \u00e9lectrode fixe), avec des classes d’exactitude allant de 0,025 % de la P.E. pour les r\u00e9f\u00e9rences primaires jusqu’\u00e0 0,5 % pour les instruments industriels. La pression peut \u00eatre relative (rapport\u00e9e \u00e0 l’ambiance), absolue (rapport\u00e9e au vide) ou diff\u00e9rentielle (entre deux points). Les calibrateurs de pression associent une source de pression r\u00e9gul\u00e9e et un capteur de r\u00e9f\u00e9rence pour l’\u00e9talonnage p\u00e9riodique de manom\u00e8tres et de transmetteurs industriels. <\/p>
An\u00e9mom\u00e8tres et d\u00e9bit d’air<\/h2>
Les an\u00e9mom\u00e8tres \u00e0 fil chaud mesurent la perte de chaleur d’un filament chauff\u00e9 expos\u00e9 au flux, avec une grande sensibilit\u00e9 aux basses vitesses (0,01 m\/s). Les an\u00e9mom\u00e8tres m\u00e9caniques \u00e0 h\u00e9lice ou \u00e0 turbine sont plus robustes et conviennent aux vitesses moyennes et \u00e9lev\u00e9es. Les tubes de Pitot mesurent la pression dynamique et, la masse volumique de l’air \u00e9tant connue, en d\u00e9duisent la vitesse (utiles dans les gaines et les installations a\u00e9rauliques). Les d\u00e9bitm\u00e8tres d’air sur bouches de soufflage et de reprise utilisent un c\u00f4ne de mesure (capture hood) \u00e0 capteur thermique ou \u00e0 turbine int\u00e9gr\u00e9. <\/p>
Analyseurs de gaz et de combustion<\/h2>
Les analyseurs de combustion mesurent simultan\u00e9ment l’O2 (capteur \u00e9lectrochimique \u00e0 zircone ou paramagn\u00e9tique), le CO, le CO2, les NOx, le SO2 et les hydrocarbures, et calculent le rendement de combustion et les pertes \u00e0 la chemin\u00e9e. Ils sont exig\u00e9s pour les contr\u00f4les p\u00e9riodiques des installations thermiques (DPR 74\/2013 en Italie) et pour la surveillance des \u00e9missions industrielles. Les d\u00e9tecteurs de gaz (CO, CO2, O2, H2S, CH4, COV) emploient des capteurs \u00e9lectrochimiques, NDIR (Non Dispersive InfraRed) pour le CO2 et les hydrocarbures, et PID (Photo Ionization Detector) pour les COV. Les compteurs de particules (diffusion laser) mesurent la concentration de particules (PM0,3-PM10) en salles blanches et pour la QAI. <\/p>
Cat\u00e9gories rassembl\u00e9es<\/h2>
La section comprend des manom\u00e8tres num\u00e9riques et analogiques, des manom\u00e8tres diff\u00e9rentiels, des calibrateurs de pression, des an\u00e9mom\u00e8tres \u00e0 fil chaud, \u00e0 h\u00e9lice et \u00e0 Pitot, des d\u00e9bitm\u00e8tres d’air, des instruments pour la r\u00e9frig\u00e9ration CVC\/R (groupes manom\u00e9triques, vacuom\u00e8tres, manifolds), des d\u00e9tecteurs de fuites de gaz (acoustiques, chimiques, \u00e0 traceur), des analyseurs de combustion, des d\u00e9tecteurs multigaz portatifs pour la s\u00e9curit\u00e9 en espaces confin\u00e9s, des moniteurs de qualit\u00e9 de l’air int\u00e9rieur (QAI) et des compteurs de particules pour salles blanches et PM ambiantes.<\/p>
Normes et crit\u00e8res de choix<\/h2>
Les normes de r\u00e9f\u00e9rence comprennent l’UNI 10389-1 pour les analyseurs de combustion, l’UNI EN 50543 pour les d\u00e9tecteurs CO2\/CO, l’EN 14181 pour le QAL des \u00e9missions, l’ISO 14644 pour les salles blanches, l’EN 779 et l’ISO 16890 pour les filtres \u00e0 air, et l’UNI EN ISO 13164 pour le CVC. Les contr\u00f4les p\u00e9riodiques des installations thermiques suivent les r\u00e9glementations nationales (DPR 74\/2013 en Italie). L’\u00e9talonnage des manom\u00e8tres s’effectue avec des balances de pression et des g\u00e9n\u00e9rateurs r\u00e9gul\u00e9s \u00e9talonn\u00e9s ISO 17025. Le choix de l’instrument d\u00e9pend de la plage, de l’exactitude requise, des classes de s\u00e9curit\u00e9 (ATEX, IECEx) pour les atmosph\u00e8res explosives, et de l’int\u00e9gration avec un logiciel de reporting. <\/p>","protected":false},"excerpt":{"rendered":"
Manom\u00e8tres, an\u00e9mom\u00e8tres, analyseurs de gaz et de combustion, compteurs de particules et instruments pour le CVC\/R.<\/p>\n","protected":false},"author":157040980,"featured_media":0,"parent":18002,"menu_order":18,"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-19493","page","type-page","status-publish","hentry"],"yoast_head":"\n
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