{"id":8657,"date":"2018-10-16T08:00:02","date_gmt":"2018-10-16T06:00:02","guid":{"rendered":"https:\/\/blog.wika.com\/en\/?p=8657"},"modified":"2024-09-17T08:10:04","modified_gmt":"2024-09-17T06:10:04","slug":"drinking-water-suitability-of-measuring-instruments","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/en\/applications\/drinking-water-suitability-of-measuring-instruments\/","title":{"rendered":"Drinking water suitability of measuring instruments"},"content":{"rendered":"

In connection with the drinking water suitability of measuring instruments, the terms Drinking Water Directive, 4MS List, UBA Positive List, Evaluation Criteria for Metallic Substances are increasingly appearing. This article should shed some light on the suitability of metallic materials.
\n<\/strong><\/p>\n

For the benefit of European citizens<\/h2>\n

As shown in fig. 1, directive 98\/83\/EC (Drinking Water Directive – DWD) is the basis of the whole discussion. The aim of this directive is to ensure a consistently high quality of drinking water within the European Union.<\/p>\n\n

\"Drinking

Fig. 1: Example: Regulations regarding the drinking water suitability of metals in Germany<\/p><\/div>\n \n

 <\/p>\n

Drinking water suitability \u2013 The implementation in Europe<\/h2>\n

EU directives have legal force and must be implemented into national law by the member states. Currently, there is a lack of harmonisation of national laws, standards etc. in relation to material or product compliance for drinking water. In 2007, 4 EU member states (France, Germany, the Netherlands, United Kingdom) joined forces and introduced a group, working together to develop a common approach to the topic. A result of this is the 4MS Common Composition List -Acceptance of metallic materials used for products in contact with drinking water.<\/p>\n

For WIKA, as a manufacturer of measuring instruments, this so-called \u201c4MS list\u201d is of great importance. It is a positive list containing all materials approved for drinking water applications. Only materials included in this list may come into contact with drinking water.<\/p>\n

Meanwhile, Italy and Portugal joined the 4MS initiative, increasing the \u201cweight\u201d of it.<\/p>\n\n

\"Pressure

Fig. 2: The meaning explained using a pressure gauge<\/p><\/div>\n \n

The meaning explained using a pressure gauge as an example<\/h2>\n

Each house contains one or more pressure gauges in the drinking water circuit. They indicate the prevailing pressure in the circuit.<\/p>\n

The blue shaded area indicates the components that come into contact with the medium. The medium, in this case drinking water, flows via the connection into the socket and the Bourdon tube. The Bourdon tube is deflected proportionally to the pressure of the drinking water. The movement on the dial indicates the pressure.<\/p>\n

The prerequisite for a pressure gauge to be used in a drinking water circuit is compliance with the DWD. This is at best achieved by sockets and Bourdon tubes which are made of materials listed in the 4MS list.<\/p>\n

 <\/p>\n

The solution: Pressure gauges from WIKA that are suitable for drinking water<\/h2>\n

WIKA offers its customers a 100-percent solution through special material pairings:
\nVariant 1: Socket and Bourdon tube made of stainless steel (stainless steels can be used without exception)
\nVariant 2: Socket: CW614N (CuZn39Pb3), Bourdon tube*<\/sup>: CW508L-DW (CuZn37)<\/p>\n

*In Germany: CW508L-DW (CuZn37) \u2013 CW453K solution will follow soon<\/sup><\/p>\n

Conclusion<\/h2>\n

The 4MS Common Composition List -Acceptance of metallic materials used for products in contact with drinking water is an important component in the design of measuring instruments for drinking water applications. Customers and manufacturers would do well to communicate clearly when purchasing and selling measuring instruments for water applications whether they are actually for drinking water. Only in this way can the conformity with the regulations be guaranteed.<\/p>\n

Note
\n<\/strong>The remaining EU members have not yet adopted comparable regulations for the implementation of the EU directive. An overview about national legislation and competent bodies can be obtained in the EU publication \u201cMaterials coming into contact with drinking water \u2013 What to watch out for? At home<\/a>\u201d<\/p>\n

Also read our article
\nPressure sensors in drinking water applications \u2013 what needs to be considered?<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

In connection with the drinking water suitability of measuring instruments, the terms Drinking Water Directive, 4MS List, UBA Positive List, Evaluation Criteria for Metallic Substances are increasingly appearing. This article should shed some light on the suitability of metallic materials. For the benefit of European citizens As shown in fig. 1, directive 98\/83\/EC (Drinking Water […]<\/p>\n","protected":false},"author":72,"featured_media":8662,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[232],"tags":[448,270,251],"class_list":["post-8657","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-applications","tag-drinkingwater","tag-materials","tag-standards-approvals-directive"],"acf":[],"yoast_head":"\nDrinking water suitability of measuring instruments - WIKA blog<\/title>\n<meta name=\"description\" content=\"Drinking water suitability of measuring instruments: This article should shed some light on the suitability of metallic materials\" \/>\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\/applications\/drinking-water-suitability-of-measuring-instruments\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Drinking water suitability of measuring instruments - 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