The Rosemount 3500P and 3500VP are the foundation of the PERpH‑X high performance pH/ORP sensor offering. ACCUGLASS pH glass electrode provides exceptional resistance to thermal and caustic degradation, reducing breakage and improving speed of response. Enhanced double junction reference electrode excels in harsh applications.

Porous Teflon liquid junction with large surface area maintains steady reference signal in dirty, fouling applications. Replaceable junction minimizes junction potentials. Molded Ryton body with EPDM, Viton, or Kalrez o‑rings. Versatile 1″ MNPT body with front and rear threads for wide mounting options. Quick connect or integral cable; VP8 connector available. Designed for superior performance in chemically aggressive, dirty fouling applications.