Rosemount / Emerson Model 372 PH electrode

pH measurements have always used thin glass membrane electrodes that slowly dissolve in water,creating a pH-sensitive surface layer.Some chemicals and environments accelerate this dissolution process,causing the electrode to become very fragile and easy to break..Examples include high temperatures,corrosive exposure,vapor exposure,and hydrofluoric acid exposure.Hydrofluoric acid (HF) is often used to etch glass and chemically attack the silicon-oxygen bonds that hold the glass matrix together.Rosemount Analytical’s new Model 372 sensor uses a new glass formulation that significantly slows this attack,making measurements at up to 1% (10,000 ppm) HF cost effective and economical.The presence of hydrofluoric acid in applications is affected by pH.When the pH is high,almost all fluoride ions exist in the relatively benign free F-form.Lower pH converts free fluoride to hydrogen fluoride,creating a solution that is more difficult to measure.The Rosemount Analytical Model 372 is an easy-to-install combination sensor that can be used to measure the pH of HF-con solutions..Although the sensor's lifetime will vary depending on temperature,pH,and high-frequency exposure,it will last much than traditional glass electrodes..

characteristic.

• Field-proven pH glass formula increases resistance to process corrosion..
• Dual-junction reference cell provides extended sensor life for process solutions con toxic ions..
• Multiple mounting options accommodated by one-piece construction and process threads in two places..
• SUPERIOR CHEMICAL RESISTANCE due to rugged Ultem¹ body,completely sealed to eliminate sensor leakage.
• Enhanced resistance to process attack offers field-proven pH glass formulation..
• Excellent chemical resistance due to rugged Ultem¹ body,fully sealed to eliminate sensor leakage..