pH Sensor Electrodes Feature Mercury-free Design - Available in glass body or in virtually unbreakable, chemical-resistant thermoplastic, Calomel-Free pH and Reference Electrodes are suited for industrial, commercial, and laboratory applications. Units feature Ag/AgCl-based double junction reference with silver ion trap that prevents contamination with silver-sensitive sample. Offered in sealed and refillable styles, electrodes operate up to 140°F with measurement range of 0-14 pH, isopotential point of pH 7.00 (0 mV), and ±0.20 pH offset ...

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Orbipore CPS91D - Digital pH sensors with Memosens technology. Measuring range 0...14 pH, Operating temperature 0...110 °C / 32...230 °F, Operating pressure 0...13 bar/0...188.5 psi

Orbisint CPS11D - Digital pH sensors with Memosens technology. pH range 0...14, Operating temperature: 0...135 °C (-15...80 °C) / 32... 275 °F (5...176 °F), Operating pressure: max. 16 bar (232 psi)

Ceragel CPS71D - Digital pH sensors with Memosens technology with double chamber reference system. Measuring range: 0...14 pH, Process pressure: max. 13 bar / 188.5 psi

DPS1 - Digital pH Sensor, max. operating temperature 60 °C (140 °F).

DRS5, pHD sc, Differential ORP Digital Sensor, max. operating temperature 60 °C (140 °F).

DPD1P1/P3, R1/R3, 2P1/3P1, 1P5/P6 - Differential pH Digital Sensor, max. operating temperature 70 °C (158 °F).

Articles, Papers and References

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How to measure pH ? (Technical notes)

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Brian LaBelle, Sensing pH, Controlling pH, InTech, May 2005

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Greg McMillan, Robert Montgomery, and Teresa Wang, Opportunities for smart wireless pH, conductivity measurements, InTech, January 2010