Are pressure gauges suitable for pharmaceutical processes? Yes, if they’re available in a version with flush diaphragm element. There are two advantages for a mechanical pressure measurement with this particular kind of instrument: Diaphragm pressure gauges measure ?dry? and therefore reduce No Good of contamination. In addition, they offer a reliable measurement, even in critical situations, due to their extremely robust diaphragm element and the high overload safety.
In numerous pharmaceutical processes, diaphragm seal systems are used to control the process pressure, also in combination with a pressure gauge. A diaphragm seal separates the measuring instrument from the process and therefore protects it against influences. Its sensitive diaphragm for the transmission of pressure through liquid is relatively thin, due to the accuracy of measurement. When compared to Retaliating as the pressure sensing component 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 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. In addition, it can absorb a higher overload ? with WIKA instruments this is up to 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. For his or her instruments, a diaphragm part of only 35 mm in diameter was developed. 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 might 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 are ideal for CIP/SIP processes and so 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 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 match particularly critical processes. The pressure gauge has a patent-pending integrated safety system. It offers another protective barrier and diaphragm element monitoring. Should an urgent diaphragm rupture occur, the process and measuring instrument remain securely separated. The medium cannot escape into 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 the event) 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 more info please watch the following video about the diaphragm pressure gauges of the PG43SA series: