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The Rosemount Analytical models 389 and 389VP are insertion style pH/ORP sensors with integral preamp. These sensors are compatible with nearly all Rosemount Analytical pH/ORP analyzers. Both models are combination sensors (pH, reference, and temperature within sensor body) and measure pH or ORP (Oxidation/Reduction Potential) of aqueous solutions in pipelines, open tanks, or ponds. Models 389 and 389VP are suitable for virtually all applications and are compatible with Rosemount Analytical and other manufacturers' instruments.d
 

The Rosemount Analytical models 389 and 389VP are housed in a molded Tefzel body with Viton o-rings, making each sensor virtually indestructible and chemically resistant. The simplified construction, designed with user convenience in mind does not require electrolyte replenishment or any high maintenance troubleshooting procedures. The 389 features an integral cable design while the 389VP is offered with a watertight Variopol VP multiple pin sensor-to-cable connector which eliminates re-wiring and cable twisting when replacing sensors. Installation is easily achieved through the wide variety of mounting configurations. Both Models feature 1 inch (MNPT) front and rear facing connections for insertion, submersion, or flow-through pH and ORP applications.d