{"id":44409,"date":"2025-03-18T13:08:24","date_gmt":"2025-03-18T13:08:24","guid":{"rendered":"https:\/\/www.alicat.com\/?post_type=support&#038;p=44409"},"modified":"2026-01-23T17:56:01","modified_gmt":"2026-01-23T17:56:01","slug":"arten-von-gasdurchflussmessgeraten","status":"publish","type":"support","link":"https:\/\/www.alicat.com\/de\/support\/types-of-gas-flow-instruments\/","title":{"rendered":"Arten von Gasdurchflussmessern und -reglern"},"content":{"rendered":"\n[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;||3px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_heading title=&#8221;Types of Gas Flow Meters and Controllers&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<p data-start=\"79\" data-end=\"410\">Knowing the Types of Gas flow meters and controllers is essential for accurately measuring, regulating, and maintaining fluid movement in industrial, laboratory, and research applications. Therefore, these devices play a crucial role in ensuring precise flow rates, stable pressures, and reliable data, optimizing process efficiency and product quality.<\/p>\n<p data-start=\"412\" data-end=\"795\">Multiple technologies exist for <a href=\"https:\/\/www.alicat.com\/support\/what-is-the-difference-between-mass-flow-and-volumetric-flow\/\">mass and volumetric flow<\/a> measurement, each suiting different applications. This guide compares key flow measurement methods, helping you choose the right solution based on accuracy, gas type, and environmental conditions.<\/p>\n<p data-start=\"412\" data-end=\"795\">[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<h3>Skip ahead to &#8230;<\/h3>\n<ol>\n\t<li><a href=\"#Laminar\">Laminar Differential Pressure<\/a><\/li>\n\t<li><a href=\"#coriolis\">Coriolis<\/a><\/li>\n\t<li><a href=\"#Thermal\">Thermal<\/a><\/li>\n\t<li><a href=\"#Ultrasonic\">Ultrasonic<\/a><\/li>\n\t<li><a href=\"#Rotameters\">Rotameters<\/a><\/li>\n\t<li><a href=\"#Optical\">Optical<\/a><\/li>\n\t<li><a href=\"#Venturi\">Venturi<\/a><\/li>\n\t<li><a href=\"#Comparison\">Gas Flow Technologies Comparison<\/a><\/li>\n<\/ol>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;7px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text module_id=&#8221;Laminar&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<h2>Laminar Differential Pressure Mass Flow Instruments<\/h2>[\/et_pb_text][et_pb_divider color=&#8221;#808080&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;3&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;3px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-meter\/laminar-dp-mass-flow-meters\/\">Laminar differential pressure-based (laminar DP) mass flow meters<\/a> and <a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-controller\/laminar-dp-mass-flow-controllers\/\">controllers<\/a>\u00a0use the\u00a0<a href=\"https:\/\/www.alicat.com\/support\/what-is-pressure-drop\/\">pressure drop<\/a> created within a laminar flow element (LFE) to measure the volumetric flow rate of a fluid. Specifically, an LFE converts turbulent flow into <a href=\"https:\/\/www.alicat.com\/support\/what-is-laminar-flow\/\">laminar flow<\/a> by separating it into an array of thin, parallel channels. Subsequently, a differential pressure sensor measures the pressure drop across these channels.\n\nBecause the flow within the channel is in a laminar state, the\u00a0<a href=\"https:\/\/www.alicat.com\/support\/theory-of-operation-laminar-differential-pressure-flow-measurement\/\">Poiseuille equation<\/a>\u00a0can be used to relate the pressure drop to the\u00a0<a href=\"https:\/\/www.alicat.com\/support\/what-is-the-difference-between-mass-flow-and-volumetric-flow\/\">volumetric flow rate<\/a>. The volumetric flow rate then converts to a highly accurate, standardized <a href=\"https:\/\/www.alicat.com\/support\/what-is-mass-flow\/\">mass flow<\/a> rate using temperature and pressure-dependent density correction factors.\n\n<a href=\"https:\/\/www.alicat.com\/support\/theory-of-operation-laminar-differential-pressure-flow-measurement\/\"><strong>How a laminar differential pressure-based mass flow controller works\u00a0\u2192<\/strong><\/a>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/05\/measurement-explainer-split-laminar.jpg&#8221; title_text=&#8221;measurement-explainer-laminar-alicat&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; width=&#8221;80%&#8221; width_tablet=&#8221;80%&#8221; width_phone=&#8221;80%&#8221; width_last_edited=&#8221;on|tablet&#8221; module_alignment=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|300|||||||&#8221; header_text_align=&#8221;center&#8221; text_orientation=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;]<p><em>Figure 1. Alicat laminar flow element diagram<\/em><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;7px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text module_id=&#8221;coriolis&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<h2>Coriolis Mass Flow Instruments<\/h2>[\/et_pb_text][et_pb_divider color=&#8221;#808080&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;3&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;3px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<span><a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-meter\/gas-low-flow-coriolis-mass-flow-meters\/\">Coriolis mass flow meters<\/a><\/span>\u00a0and\u00a0<span><a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-controller\/gas-low-flow-coriolis-controllers\/\">controllers<\/a><\/span>\u00a0use the\u00a0<span><a href=\"https:\/\/www.alicat.com\/support\/coriolis-flow-meter-operating-principle\/\">Coriolis effect<\/a><\/span> to measure the true mass flow rate of a fluid. Initially, the fluid travels through a tube (or set of tubes) which is electromagnetically actuated. As the fluid passes, the moving tube experiences slight deflections from its initial vibrational pattern.\n\nThen, sensors measure the magnitude of this change, which is entirely dependent on the mass of the fluid. This allows for precise, true mass flow measurements by Coriolis instruments.\n\n<span><a href=\"https:\/\/www.alicat.com\/support\/coriolis-flow-meter-operating-principle\/\"><strong>How a Coriolis mass flow meter works&nbsp;\u2192<\/strong><\/a><\/span>\n\n<p style=\"text-align: justify;\">[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.alicat.com\/wp-content\/uploads\/2025\/05\/measurement-explainer-split-coriolis.jpg&#8221; title_text=&#8221;measurement-explainer-coriolis-alicat&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; width=&#8221;80%&#8221; width_tablet=&#8221;80%&#8221; width_phone=&#8221;80%&#8221; width_last_edited=&#8221;on|tablet&#8221; module_alignment=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|300|||||||&#8221; header_text_align=&#8221;center&#8221; text_orientation=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;]<p><em>Figure 2. Alicat Coriolis flow element diagram<\/em><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;7px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text module_id=&#8221;Thermal&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<h2>Thermal Mass Flow Instruments<\/h2>[\/et_pb_text][et_pb_divider color=&#8221;#808080&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;3px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|7px|||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<p>As the name implies,\u00a0<span><a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-meter\/small-thermal-mass-flow-meters\/\">thermal flow meters<\/a><\/span>\u00a0and\u00a0<span><a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-controller\/small-thermal-mass-flow-controllers\/\">thermal flow controllers<\/a><\/span> use temperature to measure the flow rate of a fluid. Thermal technology traditionally works in one of two ways. <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem]\">Firstly, some meters measure the electrical current required to maintain a constant temperature across a heated element.<\/span> As fluid flows, it cools the element, dissipating heat.\u00a0<span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem]\">Consequently, higher flow rates necessitate increased current to sustain the element&#8217;s temperature, with this current directly proportional to the mass flow rate for a given set of fluid conditions. Fluid conditions are often highly dependent upon temperatures and pressures.\u00a0<\/span><\/p>\n<p><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem]\">The second method involves measuring temperatures at two points flanking a heated element (hot wire or surface).\u00a0<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem]\">When fluid passes over this heated element, it transports heat downstream, elevating the downstream sensor&#8217;s temperature while reducing the upstream sensor&#8217;s temperature.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem]\">The resultant temperature differential correlates with the fluid&#8217;s mass flow rate, subject to the same constraints as the first method.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\">[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/04\/thermal-chipflow-temperature-distribution-768&#215;264-1.webp&#8221; alt=&#8221;Thermal meter diagram&#8221; title_text=&#8221;thermal-chipflow-temperature&#8221; show_bottom_space=&#8221;off&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;1rem||1rem||true|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|300|||||||&#8221; header_text_align=&#8221;center&#8221; text_orientation=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;]<p><em>Figure 3. <span>Thermal mass flow meter principle of operation<\/span><\/em><\/p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;1rem||||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<p><span><\/span><\/p>\n<p><span><a href=\"https:\/\/www.alicat.com\/support\/mems-thermal-mass-flow-meter-operating-principle\/\"><strong>How a Thermal mass flow meter works\u00a0\u2192<\/strong><\/a><\/span><\/p>\n<p style=\"text-align: justify;\">[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;7px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text module_id=&#8221;Ultrasonic&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<h2>Ultrasonic Flow Meters<\/h2>[\/et_pb_text][et_pb_divider color=&#8221;#808080&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;3px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|7px|||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<p>Ultrasonic flow meters use sound waves to measure the flow rate of a fluid. Doppler flow meters transmit ultrasonic sound waves into the fluid. These waves are reflected off particles and bubbles in the fluid. As a result, the frequency change between the transmitted wave and the received wave can be used to measure the velocity of the fluid flow. Time of Flight flow meters use the time differential between transmitted and received sound waves (upstream and downstream) to calculate the velocity of the flow.<\/p>\n<p style=\"text-align: justify;\"><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;3&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;8px||9px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding_tablet=&#8221;||2rem||false|false&#8221; custom_padding_phone=&#8221;||2rem||false|false&#8221; custom_padding_last_edited=&#8221;on|tablet&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/04\/doppler-flow-meter.webp&#8221; alt=&#8221;Doppler flow meter illustration&#8221; title_text=&#8221;doppler-flow-meter&#8221; show_bottom_space=&#8221;off&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||1rem||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|300|||||||&#8221; header_text_align=&#8221;center&#8221; text_orientation=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;]<p><em>Figure 4. <span>Ultrasonic Doppler flow meter principle of operation<\/span><\/em><\/p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/02\/time-of-flight-flow-meter.gif&#8221; title_text=&#8221;time-of-flight-flow-meter&#8221; show_bottom_space=&#8221;off&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; width=&#8221;52%&#8221; custom_margin=&#8221;||1rem||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|300|||||||&#8221; header_text_align=&#8221;center&#8221; text_orientation=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;]<p><em>Figure 5. <span>Ultrasonic time-of-flight flow meter principle of operation<\/span><\/em><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;3px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|7px|||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]Ultrasonic flow meters can be an excellent option if you need to measure flow in systems that are too large for other technologies. Some meters\u2019 transducers can be strapped or clamped directly to the exterior of a pipe.\n<div class=\"link-with-icons-wrap m-b\"><strong><a href=\"https:\/\/www.alicat.com\/support\/choosing-an-instrument-clamp-on-flow-meters\/\" target=\"_blank\" rel=\"noopener\">Comparing portable laminar differential pressure to ultrasonic clamp-on flow meters&nbsp;\u2192<\/a><\/strong><\/div>\n<p style=\"text-align: justify;\">[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;7px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text module_id=&#8221;Rotameters&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<h2>Rotameters<\/h2>[\/et_pb_text][et_pb_divider color=&#8221;#808080&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;3&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;3px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|7px|||false|false&#8221; custom_padding_tablet=&#8221;||2rem||false|false&#8221; custom_padding_phone=&#8221;||2rem||false|false&#8221; custom_padding_last_edited=&#8221;on|tablet&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]Rotameters, also known as variable area flow meters, use a tube and float to measure volumetric flow rate.\n\nAs the fluid flows through the tube, the float rises. Equilibrium will be reached when the pressure time area forces and the buoyancy of the float counterbalance gravity. The float\u2019s height in the tube is then used to reference a flow rate on a calibrated measurement scale.\n\n<strong><a href=\"https:\/\/www.alicat.com\/industries\/bioreactor-fermentation\/flow-meters-for-bioprocessing\/\">The pros and cons of rotameters in bioprocessing\u00a0\u2192<\/a><\/strong>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|||7px|false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/04\/rotameter-300&#215;300-1.webp&#8221; alt=&#8221;Rotameter diagram&#8221; title_text=&#8221;rotameter-300&#215;300-1&#8243; show_bottom_space=&#8221;off&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; width=&#8221;84%&#8221; custom_margin=&#8221;||1rem||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|300|||||||&#8221; header_text_align=&#8221;center&#8221; text_orientation=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;]<p><em>Figure 6. Rotameter principle of operation<\/em><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;7px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text module_id=&#8221;Optical&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<h2>Optical Flow Meters<\/h2>[\/et_pb_text][et_pb_divider color=&#8221;#808080&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;3&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;3px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|7px|||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<p><span>Optical flow meters are used for fluids containing small solid particles that would likely clog devices relying on capillary bypasses or other restrictions to flow. They are also used to measure gas with liquid droplets, or liquid with bubbles.<\/span><\/p>\n<p><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem]\">These meters operate by shining a laser interference pattern into the flow stream, targeting the particles within. When the particles pass through that interference pattern, the reflected light is detected by a photo-receptor.\u00a0<\/span>The frequency of the light pulses is proportional to the velocity of the fluid flow.\u00a0\u00a0<\/p>\n<p style=\"text-align: justify;\"><\/p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|||7px|false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/04\/particle-imaging-velocimetry.webp&#8221; alt=&#8221;Particle imaging illustration&#8221; title_text=&#8221;particle-imaging-velocimetry&#8221; show_bottom_space=&#8221;off&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||1rem||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|300|||||||&#8221; header_text_align=&#8221;center&#8221; text_orientation=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;]<p><em>Figure 7. Particle imaging illustration<\/em><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;7px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text module_id=&#8221;Venturi&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<h2>Venturi Flow Meters<\/h2>[\/et_pb_text][et_pb_divider color=&#8221;#808080&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;3&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;3px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|7px|||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<p><span>Venturi devices have the advantage of being very low cost, but at the expense of flexibility. The Venturi effect is a reduction in pressure caused by a constriction in a fluid\u2019s flow path.<\/span><\/p>\n<p><span>Pressure sensors measure the pressure before and inside the length of constriction, and the meter calculates fluid velocity using Bernoulli\u2019s Equation. Bernoulli\u2019s principle states that the speed of a fluid is inversely proportional to its pressure. Therefore, by decreasing the pressure of the gas at a known constriction and measuring the differential pressure, the device can determine the volumetric flow rate.<\/span><\/p>\n<p style=\"text-align: justify;\">[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|||7px|false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.alicat.com\/wp-content\/uploads\/2024\/04\/venturi-flow-meter.webp&#8221; alt=&#8221;Differential pressure diagram&#8221; title_text=&#8221;venturi-flow-meter&#8221; show_bottom_space=&#8221;off&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||1rem||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|300|||||||&#8221; header_text_align=&#8221;center&#8221; text_orientation=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;]<p><em>Figure 8. Differential pressure diagram<\/em><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;7px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text module_id=&#8221;Comparison&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<h2>Gas Flow Technologies Comparison<\/h2>[\/et_pb_text][et_pb_divider color=&#8221;#808080&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;3px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|7px|||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<p>\u200b<span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem]\">The following table provides a concise comparison of various gas flow measurement technologies, highlighting their best applications, limitations, and key features.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem]\">This overview assists in selecting the most suitable instrument for specific operational requirements.<\/span><\/p>\n<p style=\"text-align: justify;\"><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][dvmd_table_maker _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][dvmd_table_maker_item col_label=&#8221;Instrument Type&#8221; col_content=&#8221;Instrument Type\nLaminar Differential Pressure\nCoriolis\nThermal\nUltrasonic\nRotameters (Variable Area)\nOptical\nVenturi&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/dvmd_table_maker_item][dvmd_table_maker_item col_label=&#8221;Best For&#8221; col_content=&#8221;Best For\nClean, dry gases <br> Operating temperature and pressure within sensor limits\nUnknown gas compositions <br> Sanitary applications <br> Corrosive or Aggressive gases\nKnown gas compositions <br> High-pressure <br> Insertion into pipes\nNon-invasive measurement <br> Mixed-phase fluids\nLow-cost applications <br> Near atmospheric pressure\nSmall solid particles in gas <br> Multi-phase flows\nLow-cost volumetric flow measurement&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/dvmd_table_maker_item][dvmd_table_maker_item col_label=&#8221;Avoid For&#8221; col_content=&#8221;Avoid For\nCondensing\/dirty gases <br> Unknown compositions <br> High viscosity gases\nMulti-phase fluids <br> Applications with vibrational noise\nAggressive gases <br> Unknown compositions\nApplications with vibrational noise\nApplications with varying pressure <br> Gases that are dirty, opaque, or coat glass\nPure fluids\nHigh pressure&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/dvmd_table_maker_item][dvmd_table_maker_item col_label=&#8221;Key Features&#8221; col_content=&#8221;Key Features\nHighly accurate <br> No warm-up time\nMeasures true mass flow <br> No gas property dependency\nDirect in-line measurement <br> Low zero shift\nClamp-on option <br> Large pipe diameters\nSimple and mechanical design\nLaser-based measurement <br> Good for mixed-media\nPressure-based measurement with minimal maintenance&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/dvmd_table_maker_item][\/dvmd_table_maker][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;7px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<h2><strong>Choose the Right Gas Flow Instrument<\/strong><\/h2>[\/et_pb_text][et_pb_divider color=&#8221;#808080&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;_initial&#8221; custom_padding=&#8221;3px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|7px|||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]\u200b<span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem]\">Selecting the appropriate gas flow <a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-meter\/\">meter<\/a> and <a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/mass-flow-controller\/\">controllers<\/a> or <a href=\"https:\/\/www.alicat.com\/products\/liquid-flow\/\">liquid instruments<\/a> is vital for achieving accuracy, efficiency, and optimal performance across various sectors, including <a href=\"https:\/\/www.alicat.com\/industries\/aerospace-defense\/\">aerospace<\/a>, <a href=\"https:\/\/www.alicat.com\/industries\/bioreactor-fermentation\/\">biotechnology<\/a>, energy, semiconductor manufacturing, and <a href=\"https:\/\/www.alicat.com\/industries\/research-laboratories\/\">laboratory environments<\/a>.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem]\">Our team of expert application engineers is ready to assist you in identifying the ideal solution tailored to your specific requirements. 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