pH Glass Membrane Types
Hamilton offers a variety of different pH glass membrane formulations which are optimized for specific applications. The selection chart below describes some of the different applications and the glass types which are best suited for them.
GLASS TYPES | GLASS IMPEDANCE | SUGGESTED APPLICATIONS |
---|---|---|
PHI |
Moderate |
Best lifespan in frequent SIP and autoclavation applications with very low drift. Very little shift after cleaning. Good general chemical robustness. The PHI glass is our recommended membrane glass for bioreactor installations found in R&D, upstream and downstream pharmaceutical applications. Most commonly used with - EasyFerm Plus pH Sensors, ChemoTrode, FermoTrode, InchTrode (cylindrical membrane) |
HB |
Moderate |
Best lifespan in frequent CIP and autoclavation applications. A good choice in high pH applications. Fastest response time. The HB Glass is our recommended membrane glass for food, beverage, and brewing applications. Most commonly used with - EasyFerm Bio pH Sensors |
HF |
Moderate |
The HF membrane glass formulation is specifically recommended for use in media containing hydrofluoric acid. This glass membrane is also good for flat / flush electrodes such as used in the Inchtrode. Most commonly used with - Polilyte Plus, InchTrode (flat membrane), MecoTrode, Polilyte Pro, EasyControl |
F |
Low |
Low conductivity pure water applications. Low temperature applications. Not for use with strong acids or bases. The F membrane glass is well suited for UPW and boiler water applications. Most commonly used with - IonoTrode, Liq-Glass PG |
H |
Moderate |
Provides stable readings in anhydrous or partially aqueous solutions. Low alkali error with good accuracy at high pH or elevated temperature. The H membrane glass works well for most general industrial applications. Most commonly used with - Polilyte Plus, MecoTrode |
V |
Low |
General purpose glass. Low temperature applications. Not for use with strong acids or bases. Most commonly used with - Polyplast Pro |
Related Content
- Learn about the other half of the pH sensor with our article on reference half-cell design.
- Learn how to keep that glass membrane clean with our article on best practices for cleaning pH electrodes.
- Visit our Main pH / ORP Knowledge Base Article Page to see all articles on pH sensors.