Sentron CupFET pH probe

ISFET pH probe for small sample volumes

Sentron offers a comprehensive line of high quality meters and probes for glass-free pH measurement.  The SI meter and probe line is created around Sentron’s proprietary ISFET pH sensor that offers accurate and reliable pH measurement for demanding applications.

The CupFET pH probe is especially designed for measurement of small volume samples. Measurements can be performed by placing as little as a single droplet of liquid directly onto the probe’s cup shaped tip. Sentron’s customers use the CupFET probes to directly measure the pH of fruit in the field by pressing a droplet of juice onto the probe tip. Similarly, in laboratories or industrial processes, they pipet droplets directly onto the CupFET probe tip to measure the pH of samples.

ISFET = glass-free
The CupFET probe contains Sentron’s non-glass ISFET (Ion Sensitive Field Effect Transistor) pH sensor. This sensing component is Sentron’s proprietary design and has been improved continuously over the past 15 years. In contrast to conventional glass pH electrodes, ISFET pH sensors are robust and do not require wet storage. This makes them well suited for many environmental, food and pharmaceutical applications. Even in areas like education or in laboratories, where glass pH electrodes can be used, ISFET pH measurement technology offers a much more durable and reliable solution.

Fast response time
ISFET pH sensors are fast because they measure directly at the surface. Sentron’s SI series probes can give stable readings in less than 5 seconds for almost all samples.

Extremely robust
Sentron probes are built from high quality ABS, PVC and PEEK materials. They are resistant to many aggressive solutions and can withstand rugged use. At the same time, they are light weight and easy to handle. The probes have a polymer body snap-on type connector. Unlike DIN and bayonet type connectors, there are no moving parts nor screw thread that can be damaged. In the event debris has accumulated on the ISFET sensor it can be easily cleaned with water and a brush. Sentron probes are provided with protection against Electrostatic Discharge (ESD) ensuring measurements continue even in harsher electrostatic environments.

Easy handling
The ergonomic design makes the probe easy to hold. Its reduced weight and soft flexible cable allow it to be manipulated freely. The ISFET and reference electrode are placed near each other in the “cup” shaped probe tip. This enables direct measurement of a droplet on the probe tip.

Comprehensive probe line
The CupFET is part of a comprehensive probe line that meets a broad range of pH measurement needs.