{"id":251,"date":"2019-05-10T15:18:39","date_gmt":"2019-05-10T13:18:39","guid":{"rendered":"http:\/\/technofittings.com\/wp\/mass-flow-controller-theory\/"},"modified":"2020-12-06T21:48:55","modified_gmt":"2020-12-06T20:48:55","slug":"mass-flow-controller-theory","status":"publish","type":"page","link":"https:\/\/technofittings.com\/en\/mass-flow-controller-theory\/","title":{"rendered":"Mass Flow Controller Theory"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row el_class=&#8221;header_int_empty&#8221;][vc_column][\/vc_column][\/vc_row][vc_row el_class=&#8221;int_tit_all&#8221;][vc_column][vc_column_text el_class=&#8221;int_tit&#8221;]Mass Flow Controller Theory[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/3&#8243;][vc_single_image image=&#8221;354&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221; el_class=&#8221;int_foto_bottom&#8221;][\/vc_column][vc_column width=&#8221;2\/3&#8243;][vc_column_text el_class=&#8221;int_txt_dx&#8221;]Mass flow controllers meet the most stringent requirements for all types of applications needing to monitor and regulate the flow of process gas. Thanks to the high quality of mechanical and electronic components, the reading error is much lower than normal flow meters (1% compared to full scale for all similar models), the repeatability is 0.2% compared to full scale, and the flow regulation is very fast (solenoid or diaphragm control valves). In addition the construction materials (AISI 316L stainless steel, Viton or metallic seals, depending on the application) allow its use with most process gases. Flow measurement is not affected by ambient temperature, gas pressure and mounting position.<\/p>\n<p>The main components of a mass flow controller are sensor, bypass, control valve and seals.<\/p>\n<p>The <strong>sensor<\/strong> is the mass flow controllers central element: it consists of a very thin capillary tube (stainless steel), wrapped in a resistor. Without gaseous flow the temperature inside the tube is balanced between the two ends of the sensor. When the gas passes through the capillary tube the temperature curve is distorted, thus creating a temperature differential which is measured, amplified and linearized in such a way as to create a signal capable of controlling a proportional control valve.<\/p>\n<p>The <strong>bypass<\/strong> is located downstream of the sensor and generally consists of very thin stainless steel circular &#8220;slats&#8221; or a metal &#8220;cone&#8221;. Its main purpose is to uniformly diffuse the gas flow inside the instrument and, since a very small percentage of the total gas passes through the sensor, to calculate the total flow in relation to the sensor flow.<\/p>\n<p>The <strong>control valve<\/strong> can be of three types:<br \/>\n<strong>Thermal<\/strong> valve, characterized by a response time of about 6 seconds (from 0 to 100% of full scale), normally open.<br \/>\n<strong>Solenoid<\/strong> valve, faster than the thermal valve (2 seconds between 0 and 100% of full scale), which can be normally open or closed.<br \/>\n<strong>Piezo-electric<\/strong> valve, very fast (0.2 seconds between 0 and 100% of full scale), available in normally open or closed version. This type of valve is mounted on the mass flow controllers in an internally electropolished version, for applications with hyper-pure gases.<\/p>\n<p>The <strong>seals<\/strong> can be elastomeric or metallic, in order to guarantee a suitable use for all types of gases.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row el_class=&#8221;header_int_empty&#8221;][vc_column][\/vc_column][\/vc_row][vc_row el_class=&#8221;int_tit_all&#8221;][vc_column][vc_column_text el_class=&#8221;int_tit&#8221;]Mass Flow Controller Theory[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/3&#8243;][vc_single_image image=&#8221;354&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221; el_class=&#8221;int_foto_bottom&#8221;][\/vc_column][vc_column width=&#8221;2\/3&#8243;][vc_column_text el_class=&#8221;int_txt_dx&#8221;]Mass flow controllers meet the most stringent requirements for all types of applications needing to monitor and regulate the flow of process gas. Thanks to the high quality of mechanical and electronic components, the reading error is much lower than normal flow &hellip; <a href=\"https:\/\/technofittings.com\/en\/mass-flow-controller-theory\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Mass Flow Controller Theory&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-251","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mass Flow Controller Theory - Techno Fittings<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/technofittings.com\/en\/mass-flow-controller-theory\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mass Flow Controller Theory - Techno Fittings\" \/>\n<meta property=\"og:description\" content=\"[vc_row el_class=&#8221;header_int_empty&#8221;][vc_column][\/vc_column][\/vc_row][vc_row el_class=&#8221;int_tit_all&#8221;][vc_column][vc_column_text el_class=&#8221;int_tit&#8221;]Mass Flow Controller Theory[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/3&#8243;][vc_single_image image=&#8221;354&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221; el_class=&#8221;int_foto_bottom&#8221;][\/vc_column][vc_column width=&#8221;2\/3&#8243;][vc_column_text el_class=&#8221;int_txt_dx&#8221;]Mass flow controllers meet the most stringent requirements for all types of applications needing to monitor and regulate the flow of process gas. Thanks to the high quality of mechanical and electronic components, the reading error is much lower than normal flow &hellip; Continue reading &quot;Mass Flow Controller Theory&quot;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/technofittings.com\/en\/mass-flow-controller-theory\/\" \/>\n<meta property=\"og:site_name\" content=\"Techno Fittings\" \/>\n<meta property=\"article:modified_time\" content=\"2020-12-06T20:48:55+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/technofittings.com\/en\/mass-flow-controller-theory\/\",\"url\":\"https:\/\/technofittings.com\/en\/mass-flow-controller-theory\/\",\"name\":\"Mass Flow Controller Theory - Techno Fittings\",\"isPartOf\":{\"@id\":\"https:\/\/technofittings.com\/#website\"},\"datePublished\":\"2019-05-10T13:18:39+00:00\",\"dateModified\":\"2020-12-06T20:48:55+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/technofittings.com\/en\/mass-flow-controller-theory\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/technofittings.com\/en\/mass-flow-controller-theory\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/technofittings.com\/en\/mass-flow-controller-theory\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/technofittings.com\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Mass Flow Controller Theory\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/technofittings.com\/#website\",\"url\":\"https:\/\/technofittings.com\/\",\"name\":\"Techno Fittings\",\"description\":\"Prodotti e Servizi per l&#039;Industria e la Ricerca Scientifica\",\"publisher\":{\"@id\":\"https:\/\/technofittings.com\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/technofittings.com\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/technofittings.com\/#organization\",\"name\":\"Techno Fittings S.r.l.\",\"url\":\"https:\/\/technofittings.com\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/technofittings.com\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/technofittings.com\/wp\/wp-content\/uploads\/2020\/01\/cropped-ico.png\",\"contentUrl\":\"https:\/\/technofittings.com\/wp\/wp-content\/uploads\/2020\/01\/cropped-ico.png\",\"width\":512,\"height\":512,\"caption\":\"Techno Fittings S.r.l.\"},\"image\":{\"@id\":\"https:\/\/technofittings.com\/#\/schema\/logo\/image\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Mass Flow Controller Theory - Techno Fittings","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/technofittings.com\/en\/mass-flow-controller-theory\/","og_locale":"en_US","og_type":"article","og_title":"Mass Flow Controller Theory - Techno Fittings","og_description":"[vc_row el_class=&#8221;header_int_empty&#8221;][vc_column][\/vc_column][\/vc_row][vc_row el_class=&#8221;int_tit_all&#8221;][vc_column][vc_column_text el_class=&#8221;int_tit&#8221;]Mass Flow Controller Theory[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/3&#8243;][vc_single_image image=&#8221;354&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221; el_class=&#8221;int_foto_bottom&#8221;][\/vc_column][vc_column width=&#8221;2\/3&#8243;][vc_column_text el_class=&#8221;int_txt_dx&#8221;]Mass flow controllers meet the most stringent requirements for all types of applications needing to monitor and regulate the flow of process gas. 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