Are pressure gauges ideal for pharmaceutical processes? Yes, if they are available in a version with flush diaphragm element. You can find two advantages for a mechanical pressure measurement with this kind of instrument: Diaphragm pressure gauges measure ?dry? and thus reduce the risk of contamination. In addition, they offer a reliable measurement, even yet in critical situations, due to their extremely robust diaphragm element and the high overload safety.
In various pharmaceutical processes, diaphragm seal systems are used to control the process pressure, also in conjunction with a pressure gauge. A diaphragm seal separates the measuring instrument from the process and thus protects it against influences. Its sensitive diaphragm for the transmission of pressure through liquid is relatively thin, as a result of accuracy of measurement. When compared to diaphragm as the pressure sensing component of a diaphragm pressure gauge, hence, it is 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 given that they operate without liquid. Their robust diaphragm element transmits the pressure, via a link, directly 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 high overload ? with WIKA instruments this 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. It has been implemented by WIKA in its PG43SA series. Because of their instruments, a diaphragm component of only 35 mm in diameter was developed. Due to its special wave contour and the thickness of its material, the diaphragm has a measuring quality much like the diaphragm part of a typical process instrument ? though this might become 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’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 built-into the case. This patent-pending design enables space-saving and for that reason flexible installation.
Integrated Frenzy 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 unexpected diaphragm rupture occur, the process and measuring instrument remain securely separated. The medium cannot escape in to 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 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 provided by the flyer for this instrument family.
For more info please watch the next video concerning the diaphragm pressure gauges of the PG43SA series: