Are pressure gauges suitable for pharmaceutical processes? Yes, if they’re obtainable in a version with flush diaphragm element. There are two advantages for a mechanical pressure measurement with this type of instrument: Diaphragm pressure gauges measure ?dry? and thus reduce the risk of contamination. In Prison , they provide a reliable measurement, even yet in critical situations, due to their extremely robust diaphragm element and the high overload safety.
In numerous pharmaceutical processes, diaphragm seal systems are accustomed to control the procedure pressure, also in combination 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 the diaphragm because the pressure sensing part of a diaphragm pressure gauge, it is therefore more susceptible, both to unpredictable process conditions (pressure peaks, overload) also 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 given that they operate without liquid. Their robust diaphragm element transmits the pressure, via a link, right to the movement. It really is two to five times as thick as the standard 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 around five times the nominal pressure.
Furthermore, pressure gauges for pharmaceutical processes must meet up with the stringent requirements for sanitary applications in all respects. This 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 component of an average process instrument ? though this might be more than twice the size for a comparable pressure range.
Easily cleanable
All instruments of the PG43SA series adhere to the rules of hygienic design, the 3-A Sanitary Standard and are certified to EHEDG. They are suitable for CIP/SIP processes and so are optionally completely autoclavable.
What No One Tells You 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 for that reason flexible installation.
Integrated safety system
The model PG43SA-D has been tuned to suit particularly critical processes. The pressure gauge includes a patent-pending integrated safety system. It includes 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 in to the environment basically, nothing contaminating can find its way into 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 for this instrument family.
For more info please watch the next video about the diaphragm pressure gauges of the PG43SA series: