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Glass-free pH sensors with improved CIP stability

| By Chemical Engineering


The new generation of ISFET sensors (photo) is made of unbreakable polyether ether ketone (PEEK), which offers maximum product safety, accuracy and much improved clean-in-place (CIP) stability. ISFET pH sensors can be used in any application where glass PH sensors are not desirable due to challenging process conditions or risk of breakage. The use of glass sensors is avoided in applications in the food-and-beverage or life-sciences industries, since entire production batches could become contaminated in the event of glass breakage. The ISFET sensors made of PEEK are available with three different reference systems. The new ISFET sensors, Memosens CPS47D and CPS77D, are equipped to meet the strict demands of hygienic applications. They are said to deliver stable and reproducible measured values, even after sterilization and autoclaving up to temperatures of 135°C, and come with hygiene approvals for the food and life-sciences industries, such as USP, EHEDG and 3A. — Endress+Hauser AG, Reinach, Switzerland