Innovation in Sensor Technology
HAMILTON manufactures more than pH sensors. Our electrochemical sensors are reliable tools for application-oriented use and are characterized by high quality, long life and competitive pricing. In order to meet these rigorous requirements we are constantly striving to find unique sensor designs. Extensive work by our research and development department enables HAMILTON to offer the following detailed solutions:


Precise, reliable, fast readings with a "never clog" liquid junction.

Since its introduction in 1991, the SINGLE PORE concept has been increasingly successful. The advantage of this solution is clear: instead of many tiny pores in a ceramic diaphragm, a single pore about 2000 times larger (in the form of a glass capillary) is used. The SINGLE PORE is practically impossible to clog. In combination with a special electrolyte, the flow rate through the pore is faster and provides much better contact between the reference electrode and sample. This results in a faster response time and more accurate readings.

The PTB (Physikalisch-Technische-Bundesanstalt = Physical Technical Federal Institute) in Braunschweig, Germany determined the SINGLE PORE pH electrode to be the most accurate laboratory electrode. Further information can be found in "Traceability of pH measurement" by Petra Spitzer; ISBN 3-89429-877-4 or ISSN 0947-7063

The POLISOLVE Electrolyte

Most innovative polymer reference electrolyte.

It used to be that pH electrodes with a polymer electrolyte could not be used over the entire pH or temperature range. HAMILTON has designed the innovative POLISOLVE polymer electrolyte sensors that cover a pH range from 0 to 14 and temperatures from -10°C to 130°C. As an added benefit the POLISOLVE polymer is also stable to most organic solvents and free of toxic acrylamide.

When you combine the POLISOLVE with the SINGLE PORE concept you have the solution to pH measurement in a wide application range including:

  • Industrial waste water
  • Hot sugar juice
  • Samples containing color pigments
  • Oily samples
  • Fermentation process

With the POLISOLVE PLUS electrolyte, HAMILTON has achieved an important new development that means even more stable reference signals. Thanks to an ingenious built-in filter system, reference poisons remain harmless for a lot longer. At the same time, troublesome diffusion potentials are minimized. POLISOLVE PLUS represents a significant contribution to long lasting pH sensors.

The EVEREF Reference System

Long electrode life thanks to stable reference potentials.

Stable reference systems are at the heart of reliable, long-life electrodes. This is why many HAMILTON electrodes are equipped with reference systems from the EVEREF family. The silver chloride reservoir is separated from the reference electrolyte by a diffusion distance which prevents the loss of silver chloride due to temperature variations, and allows the use of silver-free electrolytes. The EVEREF-L labyrinth system used in the POLILYTE electrodes further extends the diffusion distance to almost 200 mm, greatly increasing electrode life in aggressive media. The EVEREF-F system contains a silver barrier which prolongs electrode life in aggressive samples.

The POLISOLVE PLUS Electrolyte:
Drift while aging the sensors in 80°C hot deionized water.