Pressure gauge per EN 837-1 with mounted diaphragm seal

Liquid-filled pressure gauges are used in applications involving high dynamic shock and vibration loads. The filling liquid dampens the vibrations that occur and thus relieves the mechanical components of the pressure gauge. The principle is simple: the pressure gauge housing is filled with a liquid, usually glycerine or silicone oil. In the event of vibrations, the case filling optimally dampens the vibrations of the Bourdon tube, transmission mechanism and pointer mechanism. This prevents the pointer from fluttering, which means that the displayed measured value remains clearly legible. At the same time, the measuring system is protected from premature wear, as the filling fluid acts as a lubricant for the moving components. This considerably extends the service life of the pressure gauge. <iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/ILTgNUow3i4?si=HY4eC0_OUut-v2fR" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe> The filling liquid dampens pressure peaks, shocks and vibrations and thus protects the mechanics of the pressure gauge. This counteracts material fatigue and malfunctions. Another decisive factor for the user is the guarantee of readability of the current pressure. The filling liquid ensures that the pointer remains steady even when subjected to strong vibrations. Without liquid damping, the pointer would not indicate the actual pressure, but would move back and forth according to the vibrations or pulsations (so-called pointer flutter). In the event of resonance, deflection angles of over 180° can even occur. Last but not least, at low ambient temperatures, the sight glass can fog up and possibly ice up, which the filling liquid is able to prevent.

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The scale range of a pressure gauge defines the scale start value and full scale value of the scale printed on the dial of the pressure gauge. The correct scale range depends on the process pressure of the respective application and the process conditions. There are predefined standard scale ranges for pressure gauges in accordance with European and American standards. For special display ranges, please contact WIKA support. Ideally, the process pressure of the application should be approx. 2/3 of the full scale value of the pressure gauge. Example: For a process pressure of 40 bar, for example, a pressure gauge with a scale range of 0 to 60 bar would therefore be recommended.

The process connection standard defines how the diaphragm seal is connected to the customer process. To define this, it is important to know the counterpart in the application. WIKA offers the following process connection types: - Flange connection - Threaded connection - Hygienic connection Depending on the market or region, different standards are used, which are listed in the respective product data sheet. Further information: <iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/3Id-o9og-Vw?si=vC0g35__G-34GP1Y" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

The material of the component that comes into contact with the application-side process medium is defined. Various materials or coatings are available for the wetted parts of the diaphragm seal to enable reliable measurement of a wide range of media (aggressive, corrosive, abrasive, highly viscous, heterogeneous, aseptic, etc.). <iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/Spt2BsQwNN8?si=sb3Q1YXq-OMA-wVs" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe> A selection list of materials and further information can be found in the following data sheet: