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551 pH/ORP Sensor with Lock Nut Flange Adapter

How can you quickly and easily remove the sensor from the process without twisting the cable? The 551 sensor is the answer. When combined with the locking union connector of Barben's special 1-inch NPT nut, the 551 pH sensor can easily lock up in the process. O-ring seal on the sensor can withstand up to 100 PSIG._cc781905-5cde-3194-bb3b -136bad5cf58d_When the 551 sensor is combined with the optional all-metal Nut-Lock adapter, pressure ratings up to 300 PSIG can be achieved. Designed to fit 1-inch tee fittings, the insertion depth sensor can be ordered up to 12 inches long to accommodate flanges and extended pipe nipple installations. 


  • Patented Axial Ion Path® reference technology increases electrode life in demanding industrial applications
  • High-temperature, low-noise proprietary signal cable
  • Specialized glass formulations
  • Universally compatible with all analyzers from the manufacturer
  • Sensor Insertion Depth 2.6 to 12 inches (measured to tip of sensor)
  • (The actual color of the sensor varies depending on the material of construction)
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