Pressure gauges for pharmaceutical processes: Flush-mounted ?dry measurement?

Are pressure gauges ideal for pharmaceutical processes? Yes, if they are obtainable in a version with flush diaphragm element. There are two advantages of a mechanical pressure measurement with this type of instrument: Diaphragm pressure gauges measure ?dry? and therefore reduce the threat of contamination. In addition, they offer a reliable measurement, even in critical situations, because of their extremely robust diaphragm element and the high overload safety.
In numerous pharmaceutical processes, diaphragm seal systems are used to control the procedure pressure, also in conjunction with a pressure gauge. A diaphragm seal separates the measuring instrument from the procedure and thus protects it against influences. Its sensitive diaphragm for the transmission of pressure through liquid is relatively thin, due to the accuracy of measurement. Compared to Unheard Of as the pressure sensing part of a diaphragm pressure gauge, it is therefore more susceptible, both to unpredictable process conditions (pressure peaks, overload) and to mechanical influences. If the diaphragm is damaged, system fill fluid can enter the process.
The mechanism of a PG43SA pressure gauge with flush diaphragm element
No contamination
Pressure gauges with a flush diaphragm element eliminate such contamination since they operate without liquid. Proven transmits the pressure, with a link, directly to the movement. It is two to five times as thick as the standard diaphragm seal diaphragm. The diaphragm element is therefore effectively protected against unexpected physical effects. In addition, it can absorb a higher overload ? with WIKA instruments that is around five times the nominal pressure.
Furthermore, pressure gauges for pharmaceutical processes must meet up with the stringent requirements for sanitary applications in every respect. This has been implemented by WIKA in its PG43SA series. Because of their instruments, a diaphragm part of only 35 mm in diameter originated. Due to its special wave contour and the thickness of its material, the diaphragm includes a measuring quality much like the diaphragm part of a typical process instrument ? though this would become more than twice the size for a comparable pressure range.
Easily cleanable
All instruments of the PG43SA series adhere to the guidelines of hygienic design, the 3-A Sanitary Standard and are certified to EHEDG. They’re ideal for CIP/SIP processes and are optionally completely autoclavable.
Two of the models (PG43SA-S and PG43SA-D) are pressure gauges with a radial process connection. For the model PG43SA-C, however, the procedure connection is integrated into the case. This patent-pending design enables space-saving and for that reason flexible installation.
Integrated safety system
The model PG43SA-D has been tuned to suit particularly critical processes. The pressure gauge has a patent-pending integrated safety system. It includes a second protective barrier and diaphragm element monitoring. Should an urgent diaphragm rupture occur, the process and measuring instrument remain securely separated. The medium cannot escape in to the environment and likewise, nothing contaminating will get its way in to the process. Any instance of damage becomes known immediately: The diaphragm element monitoring reports it directly with a red indicator on the dial.
Designed as pressure gauges for pharmaceutical processes (f. l. t. r.): Model PG43SA-S (standard), model PG43SA-C (process connection in case) and model PG43SA-D (with additional safety system).
Note
For detailed information regarding the three diaphragm pressure gauges PG43SA-S, PG43SA-D and PG43SA-C, please go to the WIKA website. A concise overview is supplied by the flyer for this instrument family.
For further information please watch the following video concerning the diaphragm pressure gauges of the PG43SA series:

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