{"id":27704,"date":"2026-01-14T08:29:06","date_gmt":"2026-01-14T08:29:06","guid":{"rendered":"https:\/\/metlaninst.com\/?p=27704"},"modified":"2026-01-28T10:42:36","modified_gmt":"2026-01-28T10:42:36","slug":"thermal-mass-flow-controllers-for-gas-flow","status":"publish","type":"post","link":"https:\/\/metlaninst.com\/ar\/thermal-mass-flow-controllers-for-gas-flow\/","title":{"rendered":"Thermal Mass Flow Controllers for Gas Flow"},"content":{"rendered":"<p>Accurate control of gas flow is essential in modern industrial processes, laboratory systems, and advanced manufacturing. From semiconductor fabrication and analytical instruments to chemical processing and energy applications, gas flow must be not only measured but precisely regulated in real time. This is where the <strong>\u0648\u062d\u062f\u0629 \u0627\u0644\u062a\u062d\u0643\u0645 \u0641\u064a \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a \u0627\u0644\u062d\u0631\u0627\u0631\u064a (MFC)<\/strong> plays a critical role.<\/p><p>Unlike conventional flow control devices that rely on pressure or volumetric flow, a thermal mass flow controller directly measures and controls <strong>\u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a<\/strong>, making it particularly suitable for gas applications where density and temperature may vary. This article explains what a thermal mass flow controller is, how it works, how it differs from a thermal mass flow meter, and why it offers significant advantages for gas flow control.<\/p><div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>\u062c\u062f\u0648\u0644 \u0627\u0644\u0645\u062d\u062a\u0648\u064a\u0627\u062a<\/h2><nav><ul><li><a href=\"#what-is-a-thermal-mass-flow-controller\">What Is a Thermal Mass Flow Controller?<\/a><\/li><li><a href=\"#working-principle-of-a-thermal-mass-flow-controller\">Working Principle of a Thermal Mass Flow Controller<\/a><\/li><li><a href=\"#thermal-mass-flow-controller-vs-thermal-mass-flow-meter\">Thermal Mass Flow Controller vs Thermal Mass Flow Meter<\/a><\/li><li><a href=\"#why-thermal-mass-flow-controllers-are-ideal-for-gas-flow\">Why Thermal Mass Flow Controllers Are Ideal for Gas Flow<\/a><\/li><li><a href=\"#metlans-thermal-mass-flow-controller\">Metlan&#8217;s Thermal Mass Flow Controller<\/a><\/li><li><a href=\"#case-study-of-metlans-thermal-mass-flow-controller\">Case Study of Metlan&#8217;s Thermal Mass Flow Controller<\/a><\/li><\/ul><\/nav><\/div><ul class=\"wp-block-list\"><li><a href=\"https:\/\/metlaninst.com\/ar\/how-to-choose-a-thermal-mass-flow-controller-for-gas-applications\/\">How to Choose Thermal Mass Flow Controller<\/a><\/li><\/ul><h2 class=\"wp-block-heading\" id=\"what-is-a-thermal-mass-flow-controller\"><strong>What Is a Thermal Mass Flow Controller?<\/strong><\/h2><p>A <strong>\u0648\u062d\u062f\u0629 \u062a\u062d\u0643\u0645 \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a \u0627\u0644\u062d\u0631\u0627\u0631\u064a<\/strong> is an integrated instrument that <strong>measures, regulates, and maintains a set gas mass flow rate<\/strong> regardless of changes in pressure or temperature within a defined operating range.<\/p><p>A typical thermal mass flow controller consists of:<\/p><ul class=\"wp-block-list\"><li>A <strong>thermal mass flow sensor<\/strong><\/li>\n\n<li>A <strong>control valve<\/strong> (proportional or solenoid-based)<\/li>\n\n<li>An <strong>electronic control circuit<\/strong><\/li>\n\n<li>A <strong>setpoint input and feedback loop<\/strong><\/li><\/ul><p>The controller continuously compares the <strong>measured mass flow<\/strong> with the <strong>desired setpoint<\/strong> and automatically adjusts the valve position to maintain stable flow.<\/p><h3 class=\"wp-block-heading\" id=\"what-makes-it-mass-flow-control\"><strong>What Makes It \u201cMass\u201d Flow Control?<\/strong><\/h3><p>Unlike volumetric devices, thermal MFCs measure <strong>\u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a \u0645\u0628\u0627\u0634\u0631\u0629<\/strong>, usually expressed in:<\/p><ul class=\"wp-block-list\"><li>sccm (standard cubic centimeters per minute)<\/li>\n\n<li>slm (standard liters per minute)<\/li>\n\n<li>kg\/h or g\/h (in industrial systems)<\/li><\/ul><p>This eliminates the need for external temperature or pressure compensation, which is especially important for gases.<\/p><h2 class=\"wp-block-heading\" id=\"working-principle-of-a-thermal-mass-flow-controller\"><strong>Working Principle of a Thermal Mass Flow Controller<\/strong><\/h2><p>The working principle of a thermal mass flow controller is based on <strong>\u0646\u0642\u0644 \u0627\u0644\u062d\u0631\u0627\u0631\u0629<\/strong>.<\/p><h3 class=\"wp-block-heading\" id=\"step-by-step-operating-principle\"><strong>Step-by-Step Operating Principle<\/strong><\/h3><div class=\"wp-block-media-text has-media-on-the-right is-stacked-on-mobile\" style=\"grid-template-columns:auto 40%\"><div class=\"wp-block-media-text__content\"><ol class=\"wp-block-list\"><li><strong>Gas Flow Through the Sensor<\/strong> The gas passes through a flow channel where two temperature sensors and a small heater are installed.<\/li>\n\n<li><strong>Heat Transfer to the Gas<\/strong> The heater introduces a known amount of heat into the gas stream.<\/li>\n\n<li><strong>Temperature Difference Measurement<\/strong> As gas flows, it carries heat downstream. The temperature difference between the upstream and downstream sensors is proportional to the <strong>\u0645\u0639\u062f\u0644 \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a<\/strong> of the gas.<\/li>\n\n<li><strong>Mass Flow Signal Generation<\/strong> The sensor electronics convert this temperature difference into a precise mass flow signal.<\/li>\n\n<li><strong>Closed-Loop Control<\/strong> The controller compares the measured flow with the user-defined setpoint.<\/li>\n\n<li><strong>Valve Adjustment<\/strong> If the flow deviates from the setpoint, the control valve automatically opens or closes to correct it.<\/li><\/ol><\/div><figure class=\"wp-block-media-text__media\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"http:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-working-principle-1024x683.png\" alt=\"thermal mass flow controller working principle\" class=\"wp-image-27705 size-full\" srcset=\"https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-working-principle-1024x683.png 1024w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-working-principle-300x200.png 300w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-working-principle-768x512.png 768w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-working-principle-340x227.png 340w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-working-principle-18x12.png 18w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-working-principle-1000x667.png 1000w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-working-principle.png 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div><p>This <strong>closed-loop feedback control<\/strong> allows the thermal MFC to maintain highly stable and repeatable gas flow.<\/p><h2 class=\"wp-block-heading\" id=\"thermal-mass-flow-controller-vs-thermal-mass-flow-meter\"><strong>Thermal Mass Flow Controller vs Thermal Mass Flow Meter<\/strong><\/h2><p>Thermal mass flow controllers and <a href=\"https:\/\/metlaninst.com\/ar\/%d9%85%d9%82%d8%a7%d9%8a%d9%8a%d8%b3-%d8%a7%d9%84%d8%aa%d8%af%d9%81%d9%82-%d8%a7%d9%84%d9%83%d8%aa%d9%84%d9%8a-%d8%a7%d9%84%d8%ad%d8%b1%d8%a7%d8%b1%d9%8a-%d8%af%d9%84%d9%8a%d9%84-%d8%b4%d8%a7%d9%85\/\">\u0645\u0642\u0627\u064a\u064a\u0633 \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a \u0627\u0644\u062d\u0631\u0627\u0631\u064a<\/a> share similar sensing principles, but their <strong>functions and applications are fundamentally different<\/strong>.<\/p><h3 class=\"wp-block-heading\" id=\"functional-difference\"><strong>Functional Difference<\/strong><\/h3><figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th>Aspect<\/th><th>\u0645\u0642\u064a\u0627\u0633 \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u062d\u0631\u0627\u0631\u064a \u0627\u0644\u0643\u062a\u0644\u064a<\/th><th>Thermal Mass Flow Controller<\/th><\/tr><\/thead><tbody><tr><td>\u0627\u0644\u0648\u0638\u064a\u0641\u0629 \u0627\u0644\u0623\u0633\u0627\u0633\u064a\u0629<\/td><td>Measurement only<\/td><td>Measurement + control<\/td><\/tr><tr><td>\u0635\u0645\u0627\u0645 \u0627\u0644\u062a\u062d\u0643\u0645<\/td><td>Not included<\/td><td>Integrated<\/td><\/tr><tr><td>Setpoint Input<\/td><td>\u0644\u0627 \u064a\u0648\u062c\u062f<\/td><td>Yes<\/td><\/tr><tr><td>Flow Regulation<\/td><td>External device required<\/td><td>Automatic<\/td><\/tr><tr><td>Feedback Control<\/td><td>\u0644\u0627 \u064a\u0648\u062c\u062f<\/td><td>Yes<\/td><\/tr><\/tbody><\/table><\/figure><p>A thermal mass flow meter answers the question:<\/p><p><strong>\u201cHow much gas is flowing?\u201d<\/strong><\/p><p>A thermal mass flow controller answers:<\/p><p><strong>\u201cHow much gas is flowing, and how do I keep it exactly at the desired value?\u201d<\/strong><\/p><h3 class=\"wp-block-heading\" id=\"application-difference\"><strong>Application Difference<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>\u0645\u0642\u0627\u064a\u064a\u0633 \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u062d\u0631\u0627\u0631\u064a \u0627\u0644\u0643\u062a\u0644\u064a<\/strong><ul class=\"wp-block-list\"><li>Monitoring gas consumption<\/li>\n\n<li>Energy management<\/li>\n\n<li>Process diagnostics<\/li>\n\n<li>\u0643\u0634\u0641 \u0627\u0644\u062a\u0633\u0631\u0628<\/li><\/ul><\/li>\n\n<li><strong>Thermal Mass Flow Controllers<\/strong><ul class=\"wp-block-list\"><li>Precise gas dosing<\/li>\n\n<li>Process control<\/li>\n\n<li>Gas mixing and blending<\/li>\n\n<li>Automated production systems<\/li><\/ul><\/li><\/ul><p>In short, if your process requires <strong>active regulation<\/strong>, a flow meter alone is not sufficient.<\/p><h2 class=\"wp-block-heading\" id=\"why-thermal-mass-flow-controllers-are-ideal-for-gas-flow\"><strong>Why Thermal Mass Flow Controllers Are Ideal for Gas Flow<\/strong><\/h2><p>Gas flow control presents unique challenges compared to liquids:<\/p><ul class=\"wp-block-list\"><li>Gas density changes with temperature and pressure<\/li>\n\n<li>Low flow rates are common<\/li>\n\n<li>High precision is often required<\/li>\n\n<li>Flow instability can affect product quality<\/li><\/ul><p>Thermal mass flow controllers are specifically designed to address these challenges.<\/p><div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\"><div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><h3 class=\"wp-block-heading\" id=\"direct-mass-flow-measurement\"><strong>\u0642\u064a\u0627\u0633 \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a \u0627\u0644\u0645\u0628\u0627\u0634\u0631<\/strong><\/h3>\n\n<p>Because thermal MFCs measure <strong>\u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a \u0645\u0628\u0627\u0634\u0631\u0629<\/strong>, they are not affected by:<\/p>\n\n<ul class=\"wp-block-list\"><li>Pressure fluctuations<\/li>\n\n<li>Temperature variations (within design limits)<\/li><\/ul>\n\n<p>This makes them far more reliable than volumetric flow controllers for gases.<\/p><\/div>\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><h3 class=\"wp-block-heading\" id=\"high-accuracy-at-low-flow-rates\"><strong>High Accuracy at Low Flow Rates<\/strong><\/h3>\n\n<p>Many gas applications require extremely small and stable flows:<\/p>\n\n<ul class=\"wp-block-list\"><li>Semiconductor processes<\/li>\n\n<li>Laboratory experiments<\/li>\n\n<li>Calibration systems<\/li><\/ul>\n\n<p>Thermal mass flow controllers excel at <strong>low-flow measurement and control<\/strong>, where other technologies struggle.<\/p><\/div><\/div><div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\"><div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><h3 class=\"wp-block-heading\" id=\"fast-dynamic-response\"><strong><strong>Fast Dynamic Response<\/strong><\/strong><\/h3>\n\n<p>Because thermal MFCs measure <strong>mass flow dire<\/strong>The thermal sensing principle and electronic control allow:<\/p>\n\n<ul class=\"wp-block-list\"><li>Rapid detection of flow changes<\/li>\n\n<li>Quick valve adjustments<\/li>\n\n<li>Stable control during transient conditions<\/li><\/ul>\n\n<p>This is critical for batch processes and gas switching applications.<\/p><\/div>\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><h3 class=\"wp-block-heading\" id=\"compact-integrated-design\"><strong>Compact, Integrated Design<\/strong><\/h3>\n\n<p>A single thermal MFC replaces:<\/p>\n\n<ul class=\"wp-block-list\"><li>A flow meter<\/li>\n\n<li>A control valve<\/li>\n\n<li>A pressure regulator (in many cases)<\/li>\n\n<li>External control logic<\/li><\/ul>\n\n<p>This reduces system complexity, installation time, and potential leak points.<\/p><\/div><\/div><div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\"><div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><h3 class=\"wp-block-heading\" id=\"wide-range-of-gas-compatibility\"><strong><strong>Wide Range of Gas Compatibility<\/strong><\/strong><\/h3>\n\n<p>Thermal mass flow controllers can be calibrated for:<\/p>\n\n<ul class=\"wp-block-list\"><li>\u0627\u0644\u0647\u0648\u0627\u0621<\/li>\n\n<li><a href=\"https:\/\/metlaninst.com\/ar\/%d9%83%d9%84-%d8%b4%d9%8a%d8%a1-%d8%b9%d9%86-%d9%85%d9%82%d9%8a%d8%a7%d8%b3-%d8%aa%d8%af%d9%81%d9%82-%d8%ba%d8%a7%d8%b2-%d8%a7%d9%84%d9%86%d9%8a%d8%aa%d8%b1%d9%88%d8%ac%d9%8a%d9%86\/\" data-type=\"post\" data-id=\"26565\">\u0627\u0644\u0646\u064a\u062a\u0631\u0648\u062c\u064a\u0646 (N\u2082)<\/a><\/li>\n\n<li>\u0627\u0644\u0623\u0643\u0633\u062c\u064a\u0646 (O\u2082)<\/li>\n\n<li><a href=\"https:\/\/metlaninst.com\/ar\/how-to-choose-hydrogen-flow-meter\/\" data-type=\"post\" data-id=\"27595\">\u0627\u0644\u0647\u064a\u062f\u0631\u0648\u062c\u064a\u0646 (H\u2082)<\/a><\/li>\n\n<li><a href=\"https:\/\/metlaninst.com\/ar\/how-to-choose-argon-flow-meters\/\" data-type=\"post\" data-id=\"27546\">Argon<\/a>, helium, <a href=\"https:\/\/metlaninst.com\/ar\/%d8%a3%d9%81%d8%b6%d9%84-%d8%af%d9%84%d9%8a%d9%84-%d9%84%d9%85%d9%82%d9%8a%d8%a7%d8%b3-%d8%aa%d8%af%d9%81%d9%82-%d8%ab%d8%a7%d9%86%d9%8a-%d8%a3%d9%83%d8%b3%d9%8a%d8%af-%d8%a7%d9%84%d9%83%d8%b1%d8%a8\/\" data-type=\"post\" data-id=\"26903\">CO\u2082<\/a><\/li>\n\n<li>Specialty and mixed gases<\/li><\/ul>\n\n<p>Gas-specific calibration ensures optimal accuracy.<\/p><\/div>\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><h3 class=\"wp-block-heading\" id=\"digital-communication-and-automation-ready\"><strong>Digital Communication and Automation Ready<\/strong><\/h3>\n\n<p>Modern thermal mass flow controllers support:<\/p>\n\n<ul class=\"wp-block-list\"><li>Analog signals (0\u20135 V, 4\u201320 mA)<\/li>\n\n<li>Digital protocols (RS485, Modbus, DeviceNet)<\/li>\n\n<li>PLC and SCADA integration<\/li><\/ul>\n\n<p>This makes them ideal for automated and Industry 4.0 environments.<\/p><\/div><\/div><h2 class=\"wp-block-heading\" id=\"metlans-thermal-mass-flow-controller\">Metlan&#8217;s Thermal Mass Flow Controller<\/h2><div class=\"wp-block-media-text is-stacked-on-mobile\" style=\"grid-template-columns:40% auto\"><figure class=\"wp-block-media-text__media\"><a href=\"https:\/\/metlaninst.com\/ar\/p\/%d8%ac%d9%87%d8%a7%d8%b2-%d8%a7%d9%84%d8%aa%d8%ad%d9%83%d9%85-%d9%81%d9%8a-%d8%a7%d9%84%d8%aa%d8%af%d9%81%d9%82-%d8%a7%d9%84%d9%83%d8%aa%d9%84%d9%8a-%d9%84%d9%84%d8%ba%d8%a7%d8%b2-%d8%a7%d9%84%d8%ad\/\"><img decoding=\"async\" width=\"689\" height=\"551\" src=\"http:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller.jpg\" alt=\"\u0648\u062d\u062f\u0629 \u062a\u062d\u0643\u0645 \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a \u0627\u0644\u062d\u0631\u0627\u0631\u064a\" class=\"wp-image-27706 size-full\" srcset=\"https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller.jpg 689w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-300x240.jpg 300w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-340x272.jpg 340w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-15x12.jpg 15w\" sizes=\"(max-width: 689px) 100vw, 689px\" \/><\/a><\/figure><div class=\"wp-block-media-text__content\"><ul class=\"wp-block-list\"><li>&nbsp;\u0645\u0635\u0645\u0645\u0629 \u0644\u0642\u064a\u0627\u0633 \u0627\u0644\u063a\u0627\u0632 \u0645\u0646\u062e\u0641\u0636 \u0627\u0644\u062a\u062f\u0641\u0642.<\/li>\n\n<li>\u0646\u0633\u0628\u0629 \u0627\u0644\u062e\u0641\u0636: 50:1 \u0644\u0648\u062d\u062f\u0629 \u0627\u0644\u062a\u062d\u0643\u0645 \u0641\u064a \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a \u0627\u0644\u0631\u0642\u0645\u064a\u061b 100:1 \u0644\u0645\u0642\u064a\u0627\u0633 \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a \u0627\u0644\u0631\u0642\u0645\u064a.<\/li>\n\n<li>\u0632\u0645\u0646 \u0627\u0644\u0627\u0633\u062a\u062c\u0627\u0628\u0629: \u0648\u062d\u062f\u0629 \u0627\u0644\u062a\u062d\u0643\u0645 \u0641\u064a \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a &lt;0.2 \u062b\u0627\u0646\u064a\u0629\u061b \u0645\u0642\u064a\u0627\u0633 \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a &lt;0.1 \u062b\u0627\u0646\u064a\u0629<\/li>\n\n<li>\u0648\u062d\u062f\u0629 \u062a\u062d\u0643\u0645 PID \u0645\u062f\u0645\u062c\u0629 \u0644\u062a\u0646\u0638\u064a\u0645 \u0645\u0639\u062f\u0644 \u0627\u0644\u062a\u062f\u0641\u0642<\/li>\n\n<li>\u0642\u064a\u0627\u0633 \u0645\u0639\u062f\u0644 \u0627\u0644\u062a\u062f\u0641\u0642 \u0627\u0644\u0643\u062a\u0644\u064a \u0645\u0628\u0627\u0634\u0631\u0629\u060c \u062a\u0639\u0648\u064a\u0636 \u062f\u0631\u062c\u0629 \u0627\u0644\u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0644\u0642\u0627\u0626\u064a<\/li>\n\n<li>\u0634\u0627\u0634\u0629 \u0639\u0631\u0636 \u062a\u0639\u0645\u0644 \u0628\u0627\u0644\u0644\u0645\u0633<\/li>\n\n<li>\u0645\u0646\u0627\u0633\u0628\u0629 \u0644\u0645\u062e\u062a\u0644\u0641 \u062e\u0637\u0648\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0630\u0627\u062a \u0627\u0644\u0636\u063a\u0637 \u0627\u0644\u0639\u0627\u0644\u064a \u0648\u0627\u0644\u0645\u0646\u062e\u0641\u0636.<\/li><\/ul><\/div><\/div><h2 class=\"wp-block-heading\" id=\"case-study-of-metlans-thermal-mass-flow-controller\">Case Study of Metlan&#8217;s Thermal Mass Flow Controller<\/h2><p>In chlorine production and chemical processing, precise chlorine gas flow measurement and control is essential for process stability, product quality, and plant safety. Chlorine (Cl\u2082) is a highly corrosive and toxic gas that requires specialized instrumentation to manage both accuracy and durability.<\/p><p>This case study highlights how our <a href=\"https:\/\/metlaninst.com\/ar\/p\/%d8%ac%d9%87%d8%a7%d8%b2-%d8%a7%d9%84%d8%aa%d8%ad%d9%83%d9%85-%d9%81%d9%8a-%d8%a7%d9%84%d8%aa%d8%af%d9%81%d9%82-%d8%a7%d9%84%d9%83%d8%aa%d9%84%d9%8a-%d9%84%d9%84%d8%ba%d8%a7%d8%b2-%d8%a7%d9%84%d8%ad\/\">MTL20FD Thermal Mass Flow Controller<\/a>&nbsp;was applied in a chlorine plant, providing accurate measurement in grams per hour (g\/h) and enabling closed-loop control to optimize dosing and minimize risks.<\/p><h3 class=\"wp-block-heading\" id=\"customer-challenges\">Customer Challenges<\/h3><p>The chlorine plant faced several operational challenges:<\/p><ul class=\"wp-block-list\"><li>Stable dosing required: Chlorine flow must be precisely controlled for chemical reactions to avoid overdosing or underdosing.<\/li>\n\n<li>Corrosion resistance: Standard flow meters failed quickly due to chlorine\u2019s oxidizing nature.<\/li>\n\n<li>Process integration: The customer needed a device with 4\u201320 mA control signal for automatic regulation via DCS.<\/li>\n\n<li>Direct mass unit (g\/h): Operators required g\/h display for simplified process monitoring and reporting.<\/li>\n\n<li>Durability and safety: Equipment needed to perform reliably under 2\u20133 bar pressure without frequent maintenance.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"our-solution\">Our Solution:<\/h3><p>Key Technical Configuration of MTL20FD Thermal Mass Flow Controller<\/p><div class=\"wp-block-media-text has-media-on-the-right is-stacked-on-mobile\" style=\"grid-template-columns:auto 40%\"><div class=\"wp-block-media-text__content\"><ul class=\"wp-block-list\"><li>Medium: Chlorine gas (Cl\u2082)<\/li>\n\n<li>Flow rate: 200 g\/h<\/li>\n\n<li>\u0627\u0644\u062f\u0642\u0629: \u00b1 0.5%<\/li>\n\n<li>Display: Digital display, direct g\/h readout<\/li>\n\n<li>Sensor: PTFE-type for chemical resistance<\/li>\n\n<li>Seal: FFKM (perfluoroether rubber) for long-term sealing in corrosive service<\/li>\n\n<li>Maximum Pressure: 3Mpa<\/li>\n\n<li>Connections: Ferrule type, ID 10 mm<\/li>\n\n<li>Control signal: 4\u201320 mA for DCS integration<\/li>\n\n<li>Power supply: 24 V DC<\/li><\/ul><\/div><figure class=\"wp-block-media-text__media\"><img decoding=\"async\" width=\"768\" height=\"1024\" src=\"http:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-order-768x1024.jpg\" alt=\"thermal mass flow controller order\" class=\"wp-image-27708 size-full\" srcset=\"https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-order-768x1024.jpg 768w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-order-225x300.jpg 225w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-order-340x453.jpg 340w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-order-1152x1536.jpg 1152w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-order-9x12.jpg 9w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-order-1000x1334.jpg 1000w, https:\/\/metlaninst.com\/wp-content\/uploads\/2026\/01\/thermal-mass-flow-controller-order.jpg 1280w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"calibration-and-shipping-assurance\">Calibration and Shipping Assurance<\/h3><p>Every MTL20FD is factory-calibrated before delivery. The chlorine gas controller undergoes:<\/p><ol class=\"wp-block-list\"><li>Calibration on precision gas standards to ensure \u00b10.5% accuracy,<\/li>\n\n<li>Leak testing with FFKM seals, ensuring reliable sealing under corrosive gas,<\/li>\n\n<li>Final inspection and packaging for safe shipment.<\/li><\/ol>","protected":false},"excerpt":{"rendered":"<p>Accurate control of gas flow is essential in modern industrial processes, laboratory systems, and advanced manufacturing. From semiconductor fabrication and analytical instruments to chemical processing and energy applications, gas flow must be not only measured but precisely regulated in real time. This is where the thermal mass flow controller (MFC) plays a critical role. Unlike [&hellip;]<\/p>","protected":false},"author":1,"featured_media":27707,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[243],"tags":[],"class_list":["post-27704","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mass-flow-controllers"],"_links":{"self":[{"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/posts\/27704","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/comments?post=27704"}],"version-history":[{"count":4,"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/posts\/27704\/revisions"}],"predecessor-version":[{"id":27724,"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/posts\/27704\/revisions\/27724"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/media\/27707"}],"wp:attachment":[{"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/media?parent=27704"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/categories?post=27704"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/metlaninst.com\/ar\/wp-json\/wp\/v2\/tags?post=27704"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}