Hygienic pressure gauge: IP68 with cleaning from the outside

Vent valve instead of vent hole: With this particular option, the model PG43SA-S hygienic diaphragm pressure gauge is even suitable for pharmaceutical cleaning from the exterior with particularly aggressive agents. The closed valve seals the within of the pressure gauge in accordance with IP68 ingress protection. In this way, it prevents the penetration of cleaning media.
In the pharmaceutical industry, protecting substances and medicines from contamination is a top priority. Therefore, thorough cleaning of the equipment after every batch is indispensable. However, its effectiveness depends critically on the concentration of the substances used and the level of the temperatures.
Hygienic diaphragm pressure gauges like the WIKA model PG43SA-S are suitable for monitoring the pressure of mobile tanks in the pharmaceutical industry.
Cleaning: Caustic soda and nitric acid
In various cases, the gear not merely undergoes cleaning on the procedure side (CIP, SIP), but additionally cleaning from the outside. This also applies to a pharmaceutical company that uses the WIKA model PG43SA-S for pressure monitoring in mobile tanks. Here, Restricted cleaning process is completed from the exterior at high temperatures and with chemicals which have a significantly higher concentration. The media include, for example, 30 %30 % caustic soda and 60 %60 % nitric acid ? both in diluted form. With these substances, the measuring instrument is cleaned from all sides in a cleaning system using nozzles.
During this operation, chemicals can enter the case of the pressure gauge through the vent hole. The materials of the measuring instrument can withstand the normal soap concentrations and temperatures. However, extremely aggressive substances, as in the application form described, and/or high temperatures attack the inside of the pressure gauge as time passes. The consequence: The measuring instrument should be replaced.
WIKA diaphragm pressure gauge model PG43SA-S in the brand new version with vent valve: The sectional view shows the valve in open position. The safety ring is marked in red.
Pressure measurement with open valve
WIKA therefore addressed the question: How can the service life of the PG43SA-S be extended, even though cleaned from the outside under extreme conditions? The solution: with a version with a vent valve. The closed valve (IP68) seals off the inside of the instrument from cleaning substances. However, during its actual function, pressure monitoring, it must be open. Otherwise, correct measurement of the gauge pressure is impossible. This is because internal pressure builds up in a closed case, that leads to a falsified measurement result.
Easy operability
The brand new vent valve is clearly visible and mounted on top of the case for quick access. It is usually opened or closed without tools with a wing nut. The direction of rotation, and open and closed positions, are clearly marked on the case. The nut and the valve seal come in hygienic design. A safety ring prevents the valve from being unscrewed.
Sterilisation within an autoclave
Before each external cleaning, the vent valve is closed. The pressure gauge then has an ingress protection of IP68. If the cleaning process is accompanied by sterilisation within an autoclave, the valve should be opened again. Because of the saturated steam conditions that occur there, internal pressure would otherwise also build-up ? with Spotlight for the measuring instrument.
Conclusion
The model PG43SA-S diaphragm pressure gauge has been specifically made for a wide selection of sanitary applications. The new variant with vent valve and IP68 ingress protection has further extended the range of applications for the pressure gauge.
Note
More info on the model PG43SA-S hygienic pressure gauge and other types of the PG43SA series are available on the WIKA website. Do you want to buy hygienic pressure gauges? In our WIKA online-shop you will find some o our standard designs. In case you have any questions on pressure gauges with the IP68 ingress protection option, your contact will gladly assist you to.
See also our post
Pressure gauges for pharmaceutical processes: Flush-mounted ?dry measurement?

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