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Editor’s choice


reinstalled. Furthermore, the “alarm” is reported immediately in the event that the diaphragm is damaged. This prevents a defective instrument being installed in the process. The safety function of this self-monitoring


diaphragm seal system simultaneously optimises the protection of the non-process side: in the event of a damaged diaphragm, no dangerous substances can escape into the environment. When a company uses such a device they


show due diligence that their system is monitored through an automated system and is not left to manual inspection of a seal area.


In spite of the extremely high level of automation in pharmaceutical processes, not every measuring point absolutely has to be catered for electronically. For such cases, diaphragm pressure gauges with flush diaphragms are particularly worthwhile. These enable the measurement of low pressures and are exceptionally safe in overload as a result of their design. They keep the process sealed, even with pressure surges. Nevertheless, operators can also prepare themselves for the case of any possible damage to the diaphragm element. For such pressure gauges, WIKA also offers diaphragm monitoring, which will immediately indicate any rupture in the pressure element. Diaphragm pressure gauges are suited mainly


Flush


diaphragm pressure gauge


angled at 90°, ball valves and/or needle valves. Due to its properties and dimensions, the new model IBM monoblock is particularly suitable for protecting measuring instruments in wellhead control panels and sampling systems for process analysis. The model IBM can be designed for operating pressures up to 10,000 psi (690 bar). Even with such a load, the manufactured quality of the valve enables smooth handling with low torque. Versions with ball valves also offer a redundant polymere-metal sealing system with tested tightness in accordance with BS6755 / ISO 5208, leakage rate A. Depending on the application, the new monoblock can be configured with the valve arrangements of double block & bleed or block & bleed. The model IBM primarily fulfils an


T


upstream protective function, either separately in the pipeline or at the end of a “hook-up”. WIKA offers such assembly of measuring instruments and protective components on a customer-specific basis. It is delivered ready-to-use and leak tested.


for mobile tanks, in which intermediate and end products are stored or transported to the next processing stage. They monitor, for example, the filling and the inert gas blanket. The dimensions of such containers are getting smaller and smaller, as the pharmaceutical industry is increasingly turning to the development and manufacture of individual medicines. Processes with small units and batches are the result. The measuring instruments for the corresponding tanks therefore have limited space available. This can quickly become tight for diaphragm pressure gauges: The lower the pressure to be measured, the larger must be the diaphragm diameter and, with that, also the process connection.


he new model IBM monoblock from WIKA is designed to be space-saving and robust. The compact instrumentation valve is optionally available with threaded connections


To address this problem, WIKA has


developed a new pressure gauge for small external areas: The model PG43SA-C measures in the low-pressure ranges with a proportionately much smaller diaphragm. This instrument combines the reduced connection size with a further specific feature that is particularly important for such measuring requirements on tanks: It is autoclavable. The pressure gauge can be sterilised with the vessel under saturated steam conditions at temperatures up to +134°C, without needing to be dismounted. The process thus remains sealed, also in the mobile phase, and the quality assurance is preserved. To conclude: the more critical the


pharmaceutical process – for example, production of injection materials – the more important is the consistent maintenance of the sterile boundary in the manufacturing process. Risk prevention has, with the measurement technology used, an equally high requirement as accuracy and reliability of the process. The particular challenge is to merge the technical functionality and physical design features into an economical solution. For pharmaceutical processes are getting increasingly more efficient in view of the competitive situation – but without ever compromising safety.


WIKA www.wika.co.uk


Monoblock with two types of valve for tight installation situations


WIKA Instruments Limited info@wika.co.uk


www.wika.co.uk Instrumentation Monthly June 2020 9


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