{"id":50717,"date":"2023-06-21T12:13:50","date_gmt":"2023-06-21T10:13:50","guid":{"rendered":"https:\/\/blog.wika.com\/en\/?p=50717"},"modified":"2023-08-17T10:04:38","modified_gmt":"2023-08-17T08:04:38","slug":"stainless-steel-pressure-gauge-in-safety-version-selection-help","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/en\/knowhow\/stainless-steel-pressure-gauge-in-safety-version-selection-help\/","title":{"rendered":"Stainless steel pressure gauge in safety version: Selection guide"},"content":{"rendered":"

Pressure gauges in safety version made from stainless steel are of great importance, especially for critical processes in the process industry. They are recommended, for example, for applications with aggressive media and\/or pulsations, overpressures and pressure shocks, such as \u201cwater hammers\u201d. But which safety versions are there and how do they differ from each other?<\/strong><\/p>\n

The answer to this question can be illustrated using the most frequently requested stainless steel Bourdon tube pressure gauges from WIKA, models 232.50\/233.50 and 232.30\/233.30. Both are often colloquially referred to as \u201cchemical pressure gauges\u201d. In other words, they are designed for high requirements and therefore offer everything that customers need, especially for safety-related processes.<\/p>\n

Safety version of level S1<\/h2>\n\n
\"Pressure

Construction of a model 232.50\/233.50 pressure gauge in safety version of level S1 with blow-out device\/blow-out plug (1)<\/p><\/div>\n \n

\nThe 232.50\/233.50 pressure gauge has a blow-out device in the rear of the case in accordance with the EN 837-1 standard. It therefore corresponds to the safety version S1. Should the Bourdon tube burst in the event of a fault, a large part of the released energy can escape to the rear via the blow-out plug. However, this design does not prevent the window, other components and the medium being ejected forwards from the housing in the event of a particularly violent and sudden burst of energy \u2013 for example when a valve is opened quickly. This, in turn, can cause serious injury to anyone standing in front of the instrument at that moment.<\/p>\n

Safety version of level S3<\/h2>\n\n
\"Pressure

Construction of a model 232.30\/233.30 pressure gauge in safety version of level S3 with blow-out back (1) and solid baffle wall (2)<\/p><\/div>\n \n

\nThe 232.30\/233.30 pressure gauge is qualified as an instrument with safety version S3 in accordance with the standard and therefore offers the greatest possible protection in the event of a fault. It is marked accordingly by a circled \u201cS\u201d on the dial. The safety features of the case are a solid baffle wall and a blow-out back. Consequently, in the event of a burst Bourdon tube, any components and the medium can only escape to the rear. Operating personnel in front of the instrument are therefore always protected.<\/p>\n

Decision guidance for users<\/h2>\n

The following overview is intended to give users advice, taking into account the EN 837-2 standard (Selection and installation recommendations for pressure gauges), about in which cases which safety version is advisable.<\/p>\n