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Model 547 pH/ORP Sensor

547 pH/ORP Sensor

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Axial Ion Path® Reference
  • Patented design increases sensor life, accuracy and reliability
  • High resistance to poison: Reduced calibration offset error
  • Large surface area reference junction eliminates plugging issues
  • Eliminates error due to fluctuating pressure
  • No exotic gel or polymer electrolyte which may be incompatible with the process

The Model 547 is a replaceable, cartridge style sensor. It is designed to fit into a variety of sensor holders for direct insertion into the process. When used with a metallic sheath the 547 sensor can provide variable insertion depth for hot tap ball valve installations as well as the ability to withstand pressures up to 2500 PSIG with Barben’s high pressure housing assembly.

Pressure/Temperature Ratings


Installation Type
Threaded In-line High Pressure Retractable
Kynar (red / blue*) 2500 PSIG @ 122°F (50°C)
50 PSIG @ 266°F (130°C)
150 PSIG @ 158°F (70°C)
40 PSIG @ 266°F (130°C)
Peek (tan) 2500 PSIG @ 122°F (50°C)
50 PSIG @ 266°F (130°C)
150 PSIG @ 158°F (70°C)
40 PSIG @ 266°F (130°C)

*Blue Kynar rated to 150 PSIG @ 158°F (70°C) in threaded in-line high pressure applications.

Insertion Depth

The depth that pH / ORP sensor protrudes into the pipeline can greatly affect the measurement. Applications where the sensor tip is recessed can lead to coating and slow response. In high particulate applications abrasion of the electrode can be a concern.

A typical installation goal is to get the sensor tip at least 1/4" (6mm) into the stream. At this depth coating issues lessen and response improves due to flow velocity.

547 Insertion

Installation Methods

Isolation Ball-Valve "Hot-Tap" Applications
In-Line Applications (Threaded)
In-Line Flange Applications