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

Are pressure gauges ideal for pharmaceutical processes? Yes, if they are available in a version with flush diaphragm element. You can find two advantages of a mechanical pressure measurement with this type of instrument: Diaphragm pressure gauges measure ?dry? and thus reduce the risk 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 combination with a pressure gauge. A diaphragm seal separates the measuring instrument from the procedure and therefore protects it against influences. Its sensitive diaphragm for the transmission of pressure through liquid is relatively thin, because of the accuracy of measurement. Compared to the diaphragm because the pressure sensing part of a diaphragm pressure gauge, hence, it is 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 procedure.
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. Their robust diaphragm element transmits the pressure, with a link, right to the movement. It is two to five times as thick as a conventional diaphragm seal diaphragm. The diaphragm element is therefore effectively protected against unexpected physical effects. Furthermore, it can absorb a higher overload ? with WIKA instruments that is up to five times the nominal pressure.
Furthermore, pressure gauges for pharmaceutical processes must meet the stringent requirements for sanitary applications in all respects. It has been implemented by WIKA in its PG43SA series. For their instruments, a diaphragm element of only 35 mm in diameter originated. Because of its special wave contour and the thickness of its material, the diaphragm has a measuring quality comparable to the diaphragm element of a typical process instrument ? though this would be more than twice the size for a comparable pressure range.
Easily cleanable
All instruments of the PG43SA series comply with the guidelines of hygienic design, the 3-A Sanitary Standard and so are certified to EHEDG. They’re suitable 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 process connection is built-into the case. This patent-pending design enables space-saving and therefore flexible installation.
Integrated Convenient PG43SA-D has been tuned to match particularly critical processes. The pressure gauge has a patent-pending integrated safety system. It offers a second protective barrier and diaphragm element monitoring. Should an urgent diaphragm rupture occur, the procedure and measuring instrument remain securely separated. The medium cannot escape into the environment basically, nothing contaminating will get its way in to the process. Any instance of damage becomes known immediately: The diaphragm element monitoring reports it directly via 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 about the three diaphragm pressure gauges PG43SA-S, PG43SA-D and PG43SA-C, please visit the WIKA website. A concise overview is supplied by the flyer because of this instrument family.
For further information please watch the following video about the diaphragm pressure gauges of the PG43SA series:

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