Products Test & Measurement
Endress+Hauser releases new ISFET sensors for glass-free pH measurement

June 13, 2019 – Endress+Hauser has released a new generation of ISFET sensors made with unbreakable PEEK for glass-free pH measurement and liquid analysis.

With their new design, these ISFET sensors – Memosens CPS47D, CPS77D and CPS97D – offer up to six times greater Clean-in-Place (CIP) stability than the previous generation of ISFET sensors. They are built to perform reliably through at least 25 CIP cycles.

ISFET (Ion-sensitive field-effect transistor) sensors can be used in any applications where glass pH sensors are not desirable due to challenging process conditions or risk of breakage. Glass sensors are avoided in food and beverages applications and in the life sciences industries, since entire production batches can become contaminated in the event of glass breakage.

PEEK (polyetheretherketone) is a high-performance plastic with excellent chemical and temperature resistance. The new Endress+Hauser ISFET sensors are available with three different reference systems.

The Memosens CPS47D and CPS77D are equipped to meet the strict demands of hygienic applications. Both deliver stable and reproducible measured values, even after sterilization and autoclaving up to temperatures of 135°C, and come with all the usual hygiene approvals for the food and life sciences industries, such as USP, EHEDG and 3A, and are TSE-/BSE-free.

With its hygienic design and materials, the Memosens CPS77D also boasts bacterial tightness to ensure food production remains free from contamination.

The open diaphragm of the ISFET sensors means that they do not become clogged even in the case of high solids concentrations. The firm gel used in the reference also is extremely chemical resistant.