{"id":51220,"date":"2024-04-15T12:50:16","date_gmt":"2024-04-15T10:50:16","guid":{"rendered":"https:\/\/blog.wika.com\/en\/?p=51220"},"modified":"2025-09-01T14:02:27","modified_gmt":"2025-09-01T12:02:27","slug":"coatings-of-measuring-instruments-use-and-advantages","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/","title":{"rendered":"Coatings of measuring instruments: Use and advantages"},"content":{"rendered":"<p><strong>Process applications are becoming increasingly complex. Measuring instruments must therefore meet the highest requirements and function reliably \u2013 even with harsh outdoor conditions or aggressive media. Coatings are usually indispensable for use, for example, in the chemical, petrochemical, oil and gas industries or with hydrogen applications. Among other things, they help to increase product durability, performance and functionality in many industries.<\/strong><strong>\u00a0<\/strong><\/p>\n<h2>What are the coatings available?<\/h2>\n<p>For the wetted parts of the instruments, a wide range of special materials and coatings are available for specific areas of application. These include, for example:<\/p>\n<ul>\n<li>Gold<\/li>\n<li>ECTFE<\/li>\n<li>Stainless steel with PFA<\/li>\n<li>Wikaramic<sup>\u00ae<\/sup><\/li>\n<\/ul>\n<h2>When is the use of a coating recommended?<\/h2>\n<p>A coating is usually recommended when accurate measurement of difficult media is required. The term \u201cdifficult\u201d medium is used, for example, to include aggressive, corrosive, abrasive, highly viscous, heterogeneous, toxic, hot or aseptic media.<\/p>\n<h2>What does a coating look like?<\/h2>\n<p>During the coating process, a thinner layer of one material is generally applied to the surface of another material. The coating can therefore also be described as a separating boundary between the construction material and the environment. This explanation can be translated to the world of measuring instruments, because usually only those parts of the measuring instruments that come into contact with the medium are coated. With diaphragm seals or diaphragm seal systems or also with process transmitters, coating of the so-called diaphragm is recommended. At WIKA, for example, the coatings are applied in nuances to conserve resources.<\/p>\n<h2>What are the advantages of coatings?<\/h2>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/en\/files\/2024\/04\/coatings_388-pixel.jpg\" alt=\"Coatings such as ECTFE, antistatic PFA, FDA-compliant PFA or gold are only used in the required places. This minimises costs while at the same time conserving resources.\" \/><p class=\"wp-caption-text\">Coatings such as ECTFE, antistatic PFA, FDA-compliant PFA or gold are only used in the required places. This minimises costs while at the same time conserving resources.<\/p><\/div>\n    \n<p>Some coatings tolerate, for example, increased temperatures: When coated with stainless steel, gold or Wikaramic<sup>\u00ae<\/sup>, the upper body or the wetted parts of a diaphragm seal with flange connection (e.g. WIKA model 990.27) can be used, for example, at a maximum permissible operating temperature of 400 \u00b0C (752 \u00b0F).<br \/>\nPlease note that the maximum permissible operating temperature of the diaphragm seal system is limited by the joining method, the system fill fluid and the measuring instrument. A diaphragm coated with ECTFE is, for example, insensitive to common acids and lyes, which is often necessary for use in the chemical or petrochemical industry, while stainless steel with antistatic PFA is resistant to chemicals and withstands high temperatures. This coating is therefore predestined for use in the oil and gas industry. The non-stick coating is also suitable for Ex applications. Wikaramic<sup>\u00ae<\/sup>, on the other hand, is recommended for flush-mounted diaphragm seals in the pulp and paper industry or for processes with abrasive media.<\/p>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/en\/files\/2024\/04\/goldbeschichtung_h2_barriere_388-pixel-1.jpg\" alt=\"Coatings of measuring instruments Use and advantages\" \/><p class=\"wp-caption-text\">Coatings of measuring instruments Use and advantages<\/p><\/div>\n    \n<h2>Digression: Gold coating in H<sub>2<\/sub> applications<\/h2>\n<p>Some applications have shown that at high temperatures and a corresponding concentration gradient a coated diaphragm, be it of the measuring instrument or of the diaphragm seal, is standard. The gold coating acts as a kind of \u201cbarrier\u201d for the H<sub>2<\/sub> molecules. The metal gold slows down the hydrogen permeation process.<\/p>\n\n      <div class=\"wp-caption alignnone\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/en\/files\/2024\/04\/goldbeschichtung_wasserstoffpermeations-prozess_388-pixel-1.jpg\" alt=\"Left: Hydrogen permeation process without coating Right: With a gold-coated diaphragm\" \/><p class=\"wp-caption-text\">Left: Hydrogen permeation process without coating Right: With a gold-coated diaphragm<\/p><\/div>\n    \n<h2>\u00a0<\/h2>\n<h2>Conclusion<\/h2>\n<p>The selection of the material and the coating of the wetted parts is strongly dependent on the operating conditions. In addition to the requirements for the temperature, the pressure load and the resistance against the medium must be taken into account.<\/p>\n<p><strong>Note<br \/>\n<\/strong>As a manufacturer of pressure and temperature measurement technology, WIKA offers a variety of different materials to find the best possible solution for the challenging conditions of the measuring location. If you have any questions, your <a href=\"https:\/\/www.wika.com\/en-en\/contact.WIKA\" target=\"_blank\" rel=\"noopener external\">contact<\/a> will gladly help you. Further information on hydrogen can also be found on the <a href=\"https:\/\/www.wika.com\/en-en\/h2.WIKA\" target=\"_blank\" rel=\"noopener external\">WIKA website<\/a>.<\/p>\n<p><strong>Also read our post<br \/>\n<\/strong><a href=\"https:\/\/blog.wika.com\/en\/products\/pressure-products\/pressure-gauges-and-hydrogen-which-instruments-are-suitable\/\" target=\"_blank\" rel=\"noopener\">Pressure gauges and hydrogen: Which instruments are suitable?<\/a><\/p>\n<p><strong>Watch the following video to learn more about the coatings of measuring instruments and diaphragm seals<\/strong><\/p>\n<div data-fullscreen=\"disabled\" data-mode=\"normal\" data-oembed=\"1\" data-provider=\"youtube\" data-reset-after-played id=\"arve-youtube-spt2bsqwnn8\" style=\"max-width:900px;\" class=\"arve\">\n<div class=\"arve-inner\">\n<div style=\"aspect-ratio:500\/281\" class=\"arve-embed arve-embed--has-aspect-ratio\">\n<div class=\"arve-ar\" style=\"padding-top:56.200000%\"><\/div>\n<p>\t\t\t<iframe allow=\"accelerometer &apos;none&apos;;autoplay &apos;none&apos;;bluetooth &apos;none&apos;;browsing-topics &apos;none&apos;;camera &apos;none&apos;;clipboard-read &apos;none&apos;;clipboard-write;display-capture &apos;none&apos;;encrypted-media &apos;none&apos;;gamepad &apos;none&apos;;geolocation &apos;none&apos;;gyroscope &apos;none&apos;;hid &apos;none&apos;;identity-credentials-get &apos;none&apos;;idle-detection &apos;none&apos;;keyboard-map &apos;none&apos;;local-fonts;magnetometer &apos;none&apos;;microphone &apos;none&apos;;midi &apos;none&apos;;otp-credentials &apos;none&apos;;payment &apos;none&apos;;picture-in-picture;publickey-credentials-create &apos;none&apos;;publickey-credentials-get &apos;none&apos;;screen-wake-lock &apos;none&apos;;serial &apos;none&apos;;summarizer &apos;none&apos;;sync-xhr;usb &apos;none&apos;;web-share;window-management &apos;none&apos;;xr-spatial-tracking &apos;none&apos;;\" allowfullscreen=\"\" class=\"arve-iframe fitvidsignore\" credentialless data-arve=\"arve-youtube-spt2bsqwnn8\" data-lenis-prevent=\"\" data-src-no-ap=\"https:\/\/www.youtube-nocookie.com\/embed\/Spt2BsQwNN8?feature=oembed&amp;iv_load_policy=3&amp;modestbranding=1&amp;rel=0&amp;autohide=1&amp;playsinline=0&amp;autoplay=0&amp;enablejsapi=1\" frameborder=\"0\" height=\"505.8\" loading=\"lazy\" name=\"\" referrerpolicy=\"strict-origin-when-cross-origin\" sandbox=\"allow-scripts allow-same-origin allow-presentation allow-popups allow-popups-to-escape-sandbox\" scrolling=\"no\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/Spt2BsQwNN8?feature=oembed&#038;iv_load_policy=3&#038;modestbranding=1&#038;rel=0&#038;autohide=1&#038;playsinline=0&#038;autoplay=0&#038;enablejsapi=1\" title=\"Coatings of measuring instruments and diaphragm seals\" width=\"900\"><\/iframe><\/p><\/div>\n<\/p><\/div>\n<p>\t<script type=\"application\/ld+json\">{\"@context\":\"http:\\\/\\\/schema.org\\\/\",\"@id\":\"https:\\\/\\\/blog.wika.com\\\/en\\\/knowhow\\\/coatings-of-measuring-instruments-use-and-advantages\\\/#arve-youtube-spt2bsqwnn8\",\"type\":\"VideoObject\",\"embedURL\":\"https:\\\/\\\/www.youtube-nocookie.com\\\/embed\\\/Spt2BsQwNN8?feature=oembed&iv_load_policy=3&modestbranding=1&rel=0&autohide=1&playsinline=0&autoplay=0&enablejsapi=1\",\"name\":\"Coatings of measuring instruments and diaphragm seals\",\"thumbnailUrl\":\"https:\\\/\\\/i.ytimg.com\\\/vi\\\/Spt2BsQwNN8\\\/hqdefault.jpg\",\"uploadDate\":\"2024-01-18T08:20:13Z\",\"author\":\"WIKA Group\",\"description\":\"Discover the world of WIKA coatings and find out how they can protect your measuring instruments from damage! Our high-quality coatings ensure that your measuring instruments function for a long time and reliably. \\n\\n#WIKAgroup #DiaphragmSeals #Hydrogen #DifferentialPressureGauge #DifferentialPressure #PressureMeasurement #ECTFE #ECTFECoating #PressureGauge #PFAcoating \\n\\n\\u25ac\\u25ac Contents of this video \\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac\\u25ac \\n0:00 Intro \\n0:10 Coatings protect \\n0:18 Applications vary \\n0:29 Gold coating \\n0:47 Effective barrier \\n1:06 Consulting offered \\n\\nCoatings protect sensitive measuring instruments such as differential pressure measuring instruments, process transmitters as well as pressure gauges from damage. WIKA offers a variety of coatings that meet specific requirements. Gold coatings are particularly advantageous for applications with hydrogen gas. The coating forms an effective barrier and slows down the process of diffusion. Further examples are the ECTFE coating, which is resistant to acids and oils, and the PFA coating, which has non-stick properties. All coatings have in common that they are only applied to the necessary areas, thus reducing the use of expensive materials. \\n\\n\\ud83c\\udf10 Learn more about our differential pressure measuring instruments & process transmitters: \\n\\ud83d\\udd39  \\n\\ud83d\\udd39  \\n\\n\\ud83d\\udcd6 Read our blog article about safe pressure measurement in chlorine production:  \\n\\n_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _  \\n\\nFollow us on our social media channels: \\n\\ud83d\\udcfa YouTube:  \\n\\ud83c\\udfaf LinkedIn:\"}<\/script><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Process applications are becoming increasingly complex. Measuring instruments must therefore meet the highest requirements and function reliably \u2013 even with harsh outdoor conditions or aggressive media. Coatings are usually indispensable for use, for example, in the chemical, petrochemical, oil and gas industries or with hydrogen applications. Among other things, they help to increase product durability, [&hellip;]<\/p>\n","protected":false},"author":354,"featured_media":51226,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5],"tags":[286,285,335,313,270,504,274,563,75,575,721,324],"class_list":["post-51220","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowhow","tag-chemical","tag-diaphragm-seals","tag-hydrogen","tag-manometer","tag-materials","tag-measuring-instruments","tag-operating-conditions","tag-pressure","tag-pressure-gauge","tag-pressure-measurement-device","tag-process-safety","tag-temperature"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Coatings of measuring instruments: Use and advantages - WIKA blog<\/title>\n<meta name=\"description\" content=\"Process applications are becoming increasingly complex. Measuring instruments must therefore meet the highest requirements and function reliably \u2013 even\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Coatings of measuring instruments: Use and advantages - WIKA blog\" \/>\n<meta property=\"og:description\" content=\"Process applications are becoming increasingly complex. Measuring instruments must therefore meet the highest requirements and function reliably \u2013 even\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/\" \/>\n<meta property=\"og:site_name\" content=\"WIKA blog\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.wika.com\/en\/files\/2024\/04\/maxresdefault.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Sina Odenwald\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sina Odenwald\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/\"},\"author\":{\"name\":\"Sina Odenwald\",\"@id\":\"https:\/\/blog.wika.com\/en\/#\/schema\/person\/261c5b6cbd47eb4fe6f8502fcb9448d7\"},\"headline\":\"Coatings of measuring instruments: Use and advantages\",\"datePublished\":\"2024-04-15T10:50:16+00:00\",\"dateModified\":\"2025-09-01T12:02:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/\"},\"wordCount\":673,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.wika.com\/en\/files\/2024\/04\/maxresdefault.jpg\",\"keywords\":[\"Chemical\",\"Diaphragm seals\",\"Hydrogen\",\"Manometer\",\"Materials\",\"Measuring instruments\",\"Operating conditions\",\"Pressure\",\"Pressure gauge\",\"Pressure measurement device\",\"Process safety\",\"Temperature\"],\"articleSection\":[\"Know-how\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/\",\"url\":\"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/\",\"name\":\"Coatings of measuring instruments: Use and advantages - WIKA blog\",\"isPartOf\":{\"@id\":\"https:\/\/blog.wika.com\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/coatings-of-measuring-instruments-use-and-advantages\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.wika.com\/en\/files\/2024\/04\/maxresdefault.jpg\",\"datePublished\":\"2024-04-15T10:50:16+00:00\",\"dateModified\":\"2025-09-01T12:02:27+00:00\",\"author\":{\"@id\":\"https:\/\/blog.wika.com\/en\/#\/schema\/person\/261c5b6cbd47eb4fe6f8502fcb9448d7\"},\"description\":\"Process applications are becoming increasingly complex. 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