Sensors & Transducers


pH sensor with patented ion traps

May 2003 Sensors & Transducers

Designed for pulp and paper applications, the DynaProbe pH sensor provides extended service life in difficult measurement applications by incorporating a series of overlapping ion traps in the reference electrode. These ion traps impede the transport of contaminating ions from the process, especially when the sensor is subjected to elevated temperatures and pressures that can be found in paper and pulp applications.

Generally, pH sensors are constructed from a glass measurement electrode and a reference electrode. Statistical analysis has shown that 80% of pH sensor failures can be attributed to a failure of the reference electrode. This is because the sensor's chemistry is exposed to the process via a liquid junction. The DynaProbe's liquid junction is fabricated from a single core that is saturated with conductive electrolyte. A series of overlapping baffles are cut into the core, which act as traps and impede the migration of ions into the sensor to protect the Ag/AgCl reference electrode. DynaProbes are constructed in many different formats to suit various process connections and can be fitted into existing valve retraction systems. They can be supplied with a variety of temperature sensors for automatic temperature compensation to suit virtually any pH transmitter.



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