{"id":1763,"date":"2024-02-21T08:59:19","date_gmt":"2024-02-21T08:59:19","guid":{"rendered":"https:\/\/mems.ch\/?p=1763"},"modified":"2026-06-17T10:04:21","modified_gmt":"2026-06-17T10:04:21","slug":"functional-principle-of-the-gasqs-static","status":"publish","type":"post","link":"https:\/\/mems.ch\/de\/functional-principle-of-the-gasqs-static\/","title":{"rendered":"Funktionsprinzip des gasQS static"},"content":{"rendered":"<div class=\"et_pb_section_0 et_pb_section et_section_regular et_flex_section\">\n<div class=\"et_pb_row_0 et_pb_row et_flex_row\">\n<div class=\"et_pb_column_0 et_pb_column et-last-child et_flex_column et_pb_css_mix_blend_mode_passthrough et_flex_column_24_24 et_flex_column_24_24_tablet et_flex_column_24_24_phone\">\n<div class=\"et_pb_text_0 et_pb_text et_pb_bg_layout_light et_pb_module et_flex_module preset--module--divi-text--default\"><div class=\"et_pb_text_inner\"><p><em>Figure 1: A schematic of the temperature distribution in the gas due to the microheater (left) and an image of the microthermal sensor (right).<\/em><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n<div class=\"et_pb_row_1 et_pb_row et_flex_row\">\n<div class=\"et_pb_column_1 et_pb_column et-last-child et_flex_column et_pb_css_mix_blend_mode_passthrough et_flex_column_24_24 et_flex_column_24_24_tablet et_flex_column_24_24_phone\">\n<div class=\"et_pb_text_1 et_pb_text et_pb_bg_layout_light et_pb_module et_flex_module preset--module--divi-text--default\"><div class=\"et_pb_text_inner\"><h4 class=\"subtitle\">Bradley Visser, CTO of Mems AG, briefly explains the measuring principle of the gasQS\u2122 static<\/h4>\n<p>The gasQS\u2122 static is at the core of our range of gas quality measuring instruments. It is robust, accurate, fast, and is compensated for temperature and pressure. It is an excellent instrument for the measuring tasks it was designed for, but it also has its limits. In this article we look at the measuring principle of the gasQS static and explain why its use is limited to (quasi-)binary gas mixtures.<\/p>\n<p>The gasQS static functions on the principle of a thermal conductivity measurement \u2013 a microheater suspended on a membrane heats the surrounding gas with a constant power, and the temperature of the membrane is measured by a pair of sensors located nearby. In the absence of forced convection (i.e. a gas flow) the temperature signal is directly dependent on the thermal conductivity of the gas \u2013 the more heat that is lost through the gas, the lower the signal from the temperature sensor.<\/p>\n<p>Now, the thermal conductivity of a gas mixture is generally not of great interest to our customers, typically they would like to measure other properties such as the calorific value or methane number of the gas mixture, or the mole fraction of a particular component of the gas. In order to determine the relationship between the thermal conductivity and the customer-desired output property, each gasQS static is calibrated in-house with application specific gas mixtures. Below, an example calibration curve for a methane \u2013 hydrogen mixture at room temperature and pressure is shown.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n<div class=\"et_pb_row_2 et_pb_row et_flex_row\">\n<div class=\"et_pb_column_2 et_pb_column et-last-child et_flex_column et_pb_css_mix_blend_mode_passthrough et_flex_column_24_24 et_flex_column_24_24_tablet et_flex_column_24_24_phone\">\n<div class=\"et_pb_image_0 et_pb_image et_pb_module et_flex_module\"><span class=\"et_pb_image_wrap\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/mems.ch\/wp-content\/uploads\/2026\/06\/h2-per-thermal-conductivity.png?resize=1080%2C648&#038;ssl=1\" title=\"h2 per thermal conductivity\" width=\"1080\" height=\"648\" srcset=\"https:\/\/mems.ch\/wp-content\/uploads\/2026\/06\/h2-per-thermal-conductivity.png 1469w, https:\/\/mems.ch\/wp-content\/uploads\/2026\/06\/h2-per-thermal-conductivity-1280x769.png 1280w, https:\/\/mems.ch\/wp-content\/uploads\/2026\/06\/h2-per-thermal-conductivity-980x588.png 980w, https:\/\/mems.ch\/wp-content\/uploads\/2026\/06\/h2-per-thermal-conductivity-480x288.png 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) and (max-width: 1280px) 1280px, (min-width: 1281px) 1469px, 100vw\" class=\"wp-image-1820\" \/><\/span><\/div>\n<\/div>\n<\/div>\n\n<div class=\"et_pb_row_3 et_pb_row et_flex_row\">\n<div class=\"et_pb_column_3 et_pb_column et-last-child et_flex_column et_pb_css_mix_blend_mode_passthrough et_flex_column_24_24 et_flex_column_24_24_tablet et_flex_column_24_24_phone\">\n<div class=\"et_pb_text_2 et_pb_text et_pb_bg_layout_light et_pb_module et_flex_module preset--module--divi-text--default\"><div class=\"et_pb_text_inner\"><p><em>Figure 2: The characteristic curve of thermal conductivity of a methane-hydrogen gas mixture as a function of the hydrogen mole fraction.<\/em><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n<div class=\"et_pb_row_4 et_pb_row et_flex_row\">\n<div class=\"et_pb_column_4 et_pb_column et-last-child et_flex_column et_pb_css_mix_blend_mode_passthrough et_flex_column_24_24 et_flex_column_24_24_tablet et_flex_column_24_24_phone\">\n<div class=\"et_pb_text_3 et_pb_text et_pb_bg_layout_light et_pb_module et_flex_module preset--module--divi-text--default\"><div class=\"et_pb_text_inner\"><p>This methodology functions very well for (quasi-)binary gas mixtures for which a direct relationship between the properties can be determined. For more complex gas mixtures, whereby the fractions of each gas may vary independently, it is not possible to define such a relationship. In such cases, we recommend that our customers look to our gasQS flonic for a solution to their requirements. With three independent gas property measurements, the gasQS flonic can easily handle more complex gas mixtures.<\/p>\n<p>Differentiating between quasi-binary and multi-gas mixtures is important, for example, when working with natural gas. Natural gas is composed primarily of methane \u2013 at least 90% in most cases. The remainder is a mixture of longer chain hydrocarbons and other gases, which results in a large variance of the thermal conductivity and other gas properties. The composition and quality of natural gas supplied from a single source will generally remain constant over time, however a significant variance between different sources is to be expected.<\/p>\n<p>Mixing a constant quality natural gas with another gas (e.g. hydrogen) is a perfect example of a quasi-binary gas mixture: an increase of the hydrogen fraction is accompanied by a reduction of the natural gas fraction, with each component of the natural gas scaling equally.<\/p>\n<p>Mixing a natural gas of varying quality with another gas on the other hand is an example of a multi-gas mixture and would not be a suitable measurement task for a gasQS static. In order to illustrate this point three different natural gas\u2013hydrogen mixtures are shown in the table below that have the same thermal conductivity. Clearly in this case the measurement of thermal conductivity alone is not sufficient to determine the molar concentration of hydrogen sufficiently accurately.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n<div class=\"et_pb_row_5 et_pb_row et_flex_row\">\n<div class=\"et_pb_column_5 et_pb_column et-last-child et_flex_column et_pb_css_mix_blend_mode_passthrough et_flex_column_24_24 et_flex_column_24_24_tablet et_flex_column_24_24_phone\">\n<div class=\"et_pb_text_4 et_pb_text et_pb_bg_layout_light et_pb_module et_flex_module preset--module--divi-text--default\"><div class=\"et_pb_text_inner\"><p><em>Table 1 - Three natural gas-hydrogen mixtures with the same thermal conductivity. Large differences in the natural gas compositions are used to better illustrate the point. Such large fluctuations would not necessarily be expected at a single location.<\/em><\/p>\n<\/div><\/div>\n\n<div class=\"et_pb_text_5 et_pb_text et_pb_bg_layout_light et_pb_module et_flex_module preset--module--divi-text--default\">\n<div class=\"et_pb_text_6 et_pb_text et_pb_bg_layout_light et_pb_module et_flex_module preset--module--divi-text--default\"><div class=\"et_pb_text_inner\"><table>\n<thead>\n<tr>\n<th>methane [mol%]<\/th>\n<th>ethane [mol%]<\/th>\n<th>CO\u2082 [mol%]<\/th>\n<th>propane [mol%]<\/th>\n<th>hydrogen [mol%]<\/th>\n<th>Thermal conductivity [mW m\u207b\u00b9 K\u207b\u00b9]<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>94.9<\/td>\n<td>3<\/td>\n<td>1.1<\/td>\n<td>1<\/td>\n<td>0<\/td>\n<td>31.52<\/td>\n<\/tr>\n<tr>\n<td>90<\/td>\n<td>5<\/td>\n<td>3<\/td>\n<td>1<\/td>\n<td>1<\/td>\n<td>31.52<\/td>\n<\/tr>\n<tr>\n<td>85<\/td>\n<td>7<\/td>\n<td>3.88<\/td>\n<td>2<\/td>\n<td>2.12<\/td>\n<td>31.52<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<div class=\"et_pb_row_6 et_pb_row et_flex_row\">\n<div class=\"et_pb_column_6 et_pb_column et-last-child et_flex_column et_pb_css_mix_blend_mode_passthrough et_flex_column_24_24 et_flex_column_24_24_tablet et_flex_column_24_24_phone\">\n<div class=\"et_pb_text_7 et_pb_text et_pb_bg_layout_light et_pb_module et_flex_module preset--module--divi-text--default\"><div class=\"et_pb_text_inner\"><p>In this particular case it would be possible to realise a solution to determine the mixing percentages of the gases with two gasQS statics, with one positioned before and the other after the mixing unit. This is an option that we will discuss in a future article.<\/p>\n<p>In the plot below the response of a gasQS static calibrated for an average natural gas-hydrogen mixture is shown. The black 1:1 line represents the measurement of a natural gas-hydrogen mixture of the same quality as the calibration gas. The green dashed lines represent possible measurement results on account of reasonable changes of the quality of the natural gas compared to the calibration. For high hydrogen fractions the error becomes vanishingly small \u2013 the variation of the natural gas quality makes little difference when the thermal conductivity of the mixture is dominated by hydrogen!<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n<div class=\"et_pb_row_7 et_pb_row et_flex_row\">\n<div class=\"et_pb_column_7 et_pb_column et-last-child et_flex_column et_pb_css_mix_blend_mode_passthrough et_flex_column_24_24 et_flex_column_24_24_tablet et_flex_column_24_24_phone\">\n<div class=\"et_pb_image_1 et_pb_image et_pb_module et_flex_module\"><span class=\"et_pb_image_wrap\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/mems.ch\/wp-content\/uploads\/2026\/06\/Figure-3-EN-NEW-5bad0a7a-924f645a%401840w2x.png?resize=1080%2C648&#038;ssl=1\" title=\"Figure-3-EN-NEW-5bad0a7a-924f645a@1840w2x\" width=\"1080\" height=\"648\" srcset=\"https:\/\/mems.ch\/wp-content\/uploads\/2026\/06\/Figure-3-EN-NEW-5bad0a7a-924f645a@1840w2x.png 1840w, https:\/\/mems.ch\/wp-content\/uploads\/2026\/06\/Figure-3-EN-NEW-5bad0a7a-924f645a@1840w2x-1280x768.png 1280w, https:\/\/mems.ch\/wp-content\/uploads\/2026\/06\/Figure-3-EN-NEW-5bad0a7a-924f645a@1840w2x-980x588.png 980w, https:\/\/mems.ch\/wp-content\/uploads\/2026\/06\/Figure-3-EN-NEW-5bad0a7a-924f645a@1840w2x-480x288.png 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) and (max-width: 1280px) 1280px, (min-width: 1281px) 1840px, 100vw\" class=\"wp-image-1842\" \/><\/span><\/div>\n\n<div class=\"et_pb_text_8 et_pb_text et_pb_bg_layout_light et_pb_module et_flex_module preset--module--divi-text--default\"><div class=\"et_pb_text_inner\"><p><em>Figure 3 - A comparison of the determined mole fraction of hydrogen versus true hydrogen mole fraction for an average natural gas for which the static has been calibrated (black line) and natural gases containing 100% and 85% methane, respectively (green dashed lines). The maximum errors for the extreme gas compositions are \u00b11.8% H2, respectively.<\/em><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n<div class=\"et_pb_row_8 et_pb_row et_flex_row\">\n<div class=\"et_pb_column_8 et_pb_column et-last-child et_flex_column et_pb_css_mix_blend_mode_passthrough et_flex_column_24_24 et_flex_column_24_24_tablet et_flex_column_24_24_phone\">\n<div class=\"et_pb_text_9 et_pb_text et_pb_bg_layout_light et_pb_module et_flex_module preset--module--divi-text--default\"><div class=\"et_pb_text_inner\"><p>We hope that this article has helped to clear up any questions you may have regarding the measuring principle and the importance that calibration plays for the gasQS static. If you have any questions or feedback concerning this article or gasQS technology in general, then please don\u2019t hesitate to contact us \u2013 we\u2019d be happy to hear from you.<\/p>\n<p>If you have any questions or feedback concerning this article or gasQS technology in general, then please don\u2019t hesitate to <a href=\"\/about\/contact\/\">contact us<\/a> \u2013 we\u2019d be happy to hear from you.<\/p>\n<p><a href=\"\/products\/#gasqs_static\" title=\"gasQS static\" aria-label=\"Dieser Link f\u00fchrt zu gasQS static\" data-scrollingauto=\"yes\" data-scrollsmoothtotargetduration=\"400\"><span class=\"linkText\">gasQS static<\/span><\/a><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Wie misst das gasQS\u2122 static die Gasqualit\u00e4t anhand der W\u00e4rmeleitf\u00e4higkeit \u2013 und warum ist es auf quasi-bin\u00e4re Gemische beschr\u00e4nkt? CTO Bradley Visser erl\u00e4utert das Messprinzip.<\/p>","protected":false},"author":3,"featured_media":2051,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[17],"tags":[],"class_list":["post-1763","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Functional Principle of the gasQS\u2122 static - MEMS<\/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:\/\/mems.ch\/de\/functional-principle-of-the-gasqs-static\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Functional Principle of the gasQS\u2122 static - MEMS\" \/>\n<meta property=\"og:description\" content=\"How does the gasQS\u2122 static measure gas quality using thermal conductivity \u2014 and why is it limited to quasi-binary mixtures? 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