{"id":6766,"date":"2015-08-27T11:15:32","date_gmt":"2015-08-27T10:15:32","guid":{"rendered":"https:\/\/blog.wika.com\/en\/?p=6766"},"modified":"2024-09-11T10:53:18","modified_gmt":"2024-09-11T08:53:18","slug":"positive-material-identification-test-pmi","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/en\/knowhow\/positive-material-identification-test-pmi\/","title":{"rendered":"Positive material identification test (PMI)"},"content":{"rendered":"<p><strong>The positive material identification test &#8211; PMI test &#8211; serves as a proof of the alloying constituents present in the material, confirming the melting analysis of the material contained in the 3.1 certificate.<\/strong><\/p>\n<p>There are two different test procedures common for thermowells:<\/p>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><a href=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_PMI_FRA_Result.jpg\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_PMI_FRA_Result-388x291.jpg\" alt=\"PMI test: X-ray fluorescence analysis of the thermowell stem\" \/><\/a><p class=\"wp-caption-text\">PMI test: X-ray fluorescence analysis of the thermowell stem<\/p><\/div>\n    \n<h2>1. PMI test: X-ray fluorescence analysis (XRF)<\/h2>\n<p>X-ray fluorescence analysis uses X-rays to stimulate the atoms of the thermowell material to produce natural radiation, without damaging the surface of the metal. The wavelength and intensity of the emitted radiation is, in turn, a measure of the alloy\u2019s constituent elements and their concentration.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><a href=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_PMI_OES_Test2.jpg\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_PMI_OES_Test2-388x291.jpg\" alt=\"PMI test: Spectrographic analysis on a WIKA model TW10 flange thermowell\" \/><\/a><p class=\"wp-caption-text\">PMI test: Spectrographic analysis on a WIKA model TW10 flange thermowell<\/p><\/div>\n    \n<h2>2. PMI test: Spectrographic analysis (OES)<\/h2>\n<p>With spectrographic analysis (\u201cOptical Emission Spectroscopy\u201d), an arc is generated between the thermowell surface and a tungsten electrode in the test instrument, and the spectrum of this arc enables the alloy\u2019s elements to be identified \u2013 both qualitatively and quantitatively.<\/p>\n<p>For the OES, it does leave a characteristic burn mark of approx. 5 mm diameter on the workpiece.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n      <div class=\"wp-caption alignleft\" style=\"max-width:396px;\"><a href=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_pmi_oes_burn-388x229.jpg\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_pmi_oes_burn-388x229-388x229.jpg\" alt=\"Burn mark from the arc on a workpiece\" \/><\/a><p class=\"wp-caption-text\">Burn mark from the arc on a workpiece<\/p><\/div>\n    \n","protected":false},"excerpt":{"rendered":"<p>The positive material identification test &#8211; PMI test &#8211; serves as a proof of the alloying constituents present in the material, confirming the melting analysis of the material contained in the 3.1 certificate. There are two different test procedures common for thermowells: 1. PMI test: X-ray fluorescence analysis (XRF) X-ray fluorescence analysis uses X-rays to [&hellip;]<\/p>\n","protected":false},"author":76,"featured_media":6767,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5],"tags":[155,297,270,303],"class_list":["post-6766","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowhow","tag-corrosion","tag-euromisure","tag-materials","tag-thermowell"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Positive material identification test (PMI) - WIKA blog<\/title>\n<meta name=\"description\" content=\"The positive material identification test \u2013 PMI test \u2013 serves as a proof of the alloying constituents present in the material.\" \/>\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\/positive-material-identification-test-pmi\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Positive material identification test (PMI) - WIKA blog\" \/>\n<meta property=\"og:description\" content=\"The positive material identification test \u2013 PMI test \u2013 serves as a proof of the alloying constituents present in the material.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.wika.com\/en\/knowhow\/positive-material-identification-test-pmi\/\" \/>\n<meta property=\"og:site_name\" content=\"WIKA blog\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.wika.com\/en\/files\/2015\/08\/TW_NDE_Kopfbild_small.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"546\" \/>\n\t<meta property=\"og:image:height\" content=\"378\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Kai Grabenauer\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kai Grabenauer\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/positive-material-identification-test-pmi\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/positive-material-identification-test-pmi\/\"},\"author\":{\"name\":\"Kai Grabenauer\",\"@id\":\"https:\/\/blog.wika.com\/en\/#\/schema\/person\/f5d46df25644152af0cee53a9d9f4070\"},\"headline\":\"Positive material identification test (PMI)\",\"datePublished\":\"2015-08-27T10:15:32+00:00\",\"dateModified\":\"2024-09-11T08:53:18+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/positive-material-identification-test-pmi\/\"},\"wordCount\":216,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/positive-material-identification-test-pmi\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.wika.com\/en\/files\/2015\/08\/TW_NDE_Kopfbild_small.jpg\",\"keywords\":[\"Corrosion\",\"Euromisure\",\"Materials\",\"Thermowell\"],\"articleSection\":[\"Know-how\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/positive-material-identification-test-pmi\/\",\"url\":\"https:\/\/blog.wika.com\/en\/knowhow\/positive-material-identification-test-pmi\/\",\"name\":\"Positive material identification test (PMI) - 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