Gemme Plast offers diaphragm seal pressure gauges in Polypropylene and PVDF, designed to protect pressure measurement instruments from aggressive process conditions. Pressure gauges with diaphragm seals are a safe and accurate solution for pressure measurement; they are a closed system consisting of a diaphragm and a pressure gauge, filled with a sealing liquid.

Materials 

To adapt to different operating conditions and types of chemical agents, the diaphragm seals are available in two main materials:

• Polypropylene (PP): offers good chemical resistance to many substances, making it a versatile and economical solution for general industrial applications with moderate temperatures (up to approximately 80-90°C).
  • Compatible liquids with PP include: phosphoric acid, sulfuric acid (up to certain concentrations and temperatures), ferric chloride, citric acid, liquid ammonia, sodium hydroxide (caustic soda, at low concentrations and temperatures).
• PVDF (Polyvinylidene Fluoride): ensures exceptional chemical and thermal resistance, ideal for highly corrosive fluids, strong acids, solvents, and higher temperatures (up to approximately 150°C), as well as high purity.
  • Compatible liquids with PVDF include: acetic acid, ethyl alcohol, zinc chloride, formaldehyde, hydrochloric acid, nitric acid (up to certain concentrations), hydrogen peroxide, potassium hydroxide.

Available Models

Gemme Plast offers two configurations of diaphragm seal pressure gauges, distinguished by their pressure measurement range:

• Pressure gauge with range 0 – 2.5 bar
• Pressure gauge with range 0 – 6 bar

Both pressure gauge models (both the 2.5 bar and the 6 bar) can be coupled with a diaphragm seal made of either Polypropylene (PP) or PVDF, thus allowing the selection of the optimal combination of pressure range and chemical resistance for each specific application requirement.