Model 398R pH/ORP Sensor

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NOW OFFERING MAXIMUM PRESSURE SPECIFICATIONS of 250 psig (1825 kPa [abs]) at 100°C (212°F). SUPERIOR CHEMICAL RESISTANCE provided with the proven TUpH® technology to tackle the most aggressive applications. TITANIUM AND Tefzel® CONSTRUCTION with choice of Kalrez® or Viton® seals allows sensor to be tailored to individual process needs. STANDS UP TO CHLORINE DIOXIDE in pulp bleaching towers and resists a wide variety of organic solvents and oxidizing agents. MINIMUM SENSOR MAINTENANCE because of patented TUpH® reference technology which ensures long life in processes that coat, foul, and poison most other electrodes.

FEATURES AND APPLICATIONS The chemical-resistant construction of Tefzel®, titanium, and the patented TUpH® reference junction makes Models 398 and 398R the ideal sensors for measuring pH in harsh process liquids. Use Models 398 and 398R to measure pH in sour water strippers, in pulp bleaching towers that use chlorine dioxide, and in process streams containing a variety of organic solvents. The TUpH® reference technology provides maximum life and ensures low maintenance in processes that typically coat reference junctions. Standard porous junctions that plug mean noisy, drifting pH readings and increased maintenance. The TUpH® junction fights plugging in two ways. TUpH® junction pores are much smaller than the smallest particles likely to be in the process. Therefore, particles do not block the pores but remain on the surface. And, the large surface area means solids can accumulate on the junction, yet the sensor provides a steady pH signal. TUpH® sensors also resist poisoning. The long internal helical diffusion pathway hinders poisoning agents, like sulfide, mercury, cyanide, and ammonia, from migrating into the reference electrode. The AccuGlass® pH bulb means the Models 398 and 398R resist cracking and has near theoretically perfect response even at extreme pH values. A slotted tip surrounding the glass bulb provides additional protection against breakage. The sensor can be oriented with the bulb directly in the stream, or it can be turned ninety degrees, permitting the shroud to protect the glass bulb from particles. Models 398 and 398R use the highest quality of materials to provide superior chemical resistance. Both sensors are housed in a titanium tube. The molded Tefzel® TUpH® construction is offered with a choice of seals (Viton® or Kalrez®). Combining high quality materials with the TUpH® reference technology and AccuGlass® pH bulb allows for ultimate chemical resistance and makes Models 398 and 398R the perfect choice for measuring pH in harsh, demanding processes. Models 398 and 398R are available with 15 ft. of cable for wiring directly to an analyzer/transmitter or a remote junction box. The Model 398R retractable sensor is also available with 9.5" of cable for use with a sensor head junction box which attaches to the sensor tube via a compression fitting. Due to the high impedance pH signal, a preamplifier must be used and can be housed in the analyzer/ transmitter or junction box. Both sensors are compatible with all Rosemount Analytical and various other manufacturers instruments. Viton® is a registered trademark DuPont Performance Elastomers. Kalrez® is a registered trademark DuPont Performance Elastomers. Tefzel® is a registered trademark DuPont Films. AccuGlass® is a registered trademark of Rosemount Analytical, Inc. TUpH® is a registered trademark of Rosemount Analytical, Inc.