What are the typical application scenarios of PP diaphragm pressure gauges

PP diaphragm pressure gauges, with their polypropylene (PP) body and corrosion-resistant diaphragm materials (such as PTFE and Viton), occupy a unique position in the industrial pressure measurement field. Unlike traditional metal pressure gauges, the core value of PP diaphragm gauges lies in their superior chemical resistance and cost-effectiveness. Typical applications focus on processes involving highly corrosive media, ensuring that instrument components are protected from corrosion while providing reliable pressure readings.

Chemical and Petrochemical Industries: Challengers of Acidic and Alkaline Media

The petrochemical and chemical processing industries are core application areas for PP diaphragm pressure gauges, as their processes frequently involve strong acids, strong alkalis, saline solutions, and other highly corrosive fluids.

1. Chlor-Alkali Industry

The chlor-alkali process is a crucial component of the petrochemical industry, involving the electrolysis of brine to produce chlorine, hydrogen, and caustic soda.

Applicable Media: Hydrochloric acid, highly concentrated caustic soda solutions, saturated brine, etc. These media are extremely corrosive to metals such as stainless steel.

Advantages of PP Diaphragm Gauges: PP material offers excellent acid and alkali resistance, effectively resisting the corrosion of hydrochloric acid and caustic soda. Combined with PTFE diaphragms, PP diaphragm pressure gauges become the standard instrument for monitoring pressure in pipelines, reactors, and storage tanks in these processes.

2. Pickling and Electroplating Processes

In industries such as steel, semiconductors, and PCB manufacturing, pickling and electroplating processes are critical steps, involving large amounts of corrosive acids such as sulfuric acid, nitric acid, and hydrofluoric acid.

Applicable Media: Sulfuric acid, nitric acid, and hydrochloric acid.

Advantages of PP Diaphragm Gauges: The integrated PP body design effectively prevents corrosive liquid leaks from harming the environment and operators, ensuring long-term stability in corrosive vapor and liquid environments. It's an ideal choice for acidic fluid transfer pumps, filtration equipment, and tanks.

Water Treatment and Environmental Protection: High Purity and Low-Concentration Corrosion

The water treatment industry, including industrial wastewater treatment, ultrapure water production, and municipal water supply and drainage, places slightly different corrosion resistance requirements on instruments than the chemical industry, focusing more on environments with mixed corrosives and long-term exposure to corrosive vapors.

1. Wastewater Treatment Systems

During wastewater treatment, various flocculants, defoamers, and acid-base neutralizers are added, resulting in a complex media composition and often containing suspended matter.

Applicable Media: Mixed wastewaters of various pH values, polyaluminum chloride, sodium hypochlorite disinfectant, etc.

Advantages of PP Diaphragm Gauges: The PP body offers excellent resistance to these mixed chemicals. The diaphragm design (especially the flush diaphragm) effectively prevents slurry or solid particles in the medium from accumulating and clogging the pressure port, ensuring accurate pressure measurement.

2. Desalination and Ultrapure Water Production

Desalination involves high-salinity seawater, and ultrapure water production has strict limits on metal ion precipitation.

Advantages of PP diaphragm pressure gauges: PP material contains no metal elements, preventing the precipitation of metal ions (such as iron and copper) from contaminating ultrapure water, making it the preferred non-metallic pressure gauge for pressure measurement in high-purity fluid systems.

Other Professional Applications

Beyond large-scale process industries, PP diaphragm pressure gauges also play an irreplaceable role in certain specialized manufacturing fields.

1. Printed Circuit Board (PCB) Manufacturing

The PCB manufacturing process requires multiple rounds of chemical etching, cleaning, and plating.

Applicable Media: Various etching solutions, developers, and cleaning agents.

Advantages of PP Diaphragm Meters: PCB factory environments are sensitive to acidic and alkaline vapors. PP offers strong resistance to chemical vapor corrosion, and its compact, integrated design makes it ideal for integration into wet benches and chemical supply systems.

2. Liquid Filtration and Dosing Pumps

In chemical metering and filtration, precise monitoring of pump outlet pressure is essential for flow control and system safety.

Advantages of PP Diaphragm Meters: They typically feature threaded connections (such as NPT or BSP), making them easy to integrate with PP piping systems. Their diaphragm protects the internal Bourdon tube from both pump pressure surges and corrosive liquids.