7777DVP Durafet® III pH Immersion/In-Line Mountings

Honeywell defines state-of-the-art pH measurement with the Durafet pH electrode, a non-glass, unbreakable, Ion Sensitive Field Effect Transistor (ISFET)-based pH sensor. This industry-proven pH electrode, with over 14 years of application experience, provides fast, accurate and dependable pH measurement in the most demanding applications. The Durafet electrodes include a connector, enabling easy and reliable electrode replacement without twisting of cables.

Honeywell's 7777DVP Series of electrode mountings enables users to interface Durafet III pH electrodes to a process via a ¾" threaded connection by either submersing the electrode or mounting it into a ¾" threaded connection. Durafet pH electrodes are the first industrial ISFET-based pH sensors.

The Durafet III pH electrodes offer a reliable combination of measuring and reference electrodes together with an integral automatic temperature compensator PT1000 or NKT8.5K in a one-piece

corrosion-resistant molded Ryton body. Quick disconnect Vario Pin connectors enable easier installation and maintenance than with any other electrode available. The compact Durafet III electrodes with 3/4" NPT male connections are easily adapted for in-line mounting without O-rings or special seals.

The combination Durafet III pH electrode incorporates a replaceable reference junction frit and gel, assuring long life even in the most highly fouling applications. In addition, Durafet III electrodes can be interfaced with virtually any existing pH instrumentation, thus allowing wide freedom of use.



Durafet III Electrode

  • Uses ISFET (Ion Sensitive Field Effect Transistor) technology for exceptionally fast response
  • Virtually unbreakable, truly solid state
  • Integral or quick disconnect cable options
  • New "no epoxy" packaging design
  • Reference junction frit and gel are replaceable
  • Low impedance pH signal
  • One electrode for entire pH and temperature ranges
  • Retrofit to existing pH instrumentation
  • Suitable for in-line applications
  • Speed of response up to 10 times faster than glass pH electrodes
  • No Sodium Ion interference at high pH levels


7777 Mounting

  • FM-approved intrinsically safe for Class I, Division 1, Group A, B, C, D areas with APT2000 Series transmitters and barriers
  • Rugged combination electrodes with fast-responding integral automatic temperature compensator
  • Molded, chemically-resistant Ryton body
  • Large reference electrode volume uses a true gel fill that maintains high viscosity with temperature
  • Rugged molded NEMA 6 submersible polypropylene preamp module housing