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Rosemount™ 400 Contacting Conductivity Sensor
Rosemount 400 Conductivity Sensor
The Rosemount 400 Contacting Conductivity Sensor, with integral cable, accurately measures electrolytic conductivity in a broad range of applications from high purity water to clean cooling water.
The Rosemount 400 conductivity sensor is ideal for use in clean, non-corrosive liquid having less than 20,000 µS/cm.
Rosemount™ 400 Contacting Conductivity Sensor


Cell constants: 0.01, 0.1, and 1.0/cm
Vacuum: At 1.6 in. Hg (5.2 kPa) air leakage is less than 0.005 SCFM (0.00014 m3/min)
Cable length (Model 400 only): 10 ft (3.1 m) standard; 50 ft (15.2 m) optional
Materials of Construction
Wetted Materials: Electrodes - titanium; Body - 316 stainless steel;
Insulator - PEEK; O-Rings - EPDM
Standard: 32 - 221 °F (0 - 105°C)
With optional integral junction box: 32 - 392 °F (0 - 200°C)


  • Factory-measured cell constant ensures out-of-the-box accuracy and no initial calibration requirements
  • Available in cell constants of 0.01, 0.1, and 1.0/cm
  • Conductivity sensor designed for direct screw-in insertion into process piping using a front facing 3/4 inch MNPT fitting
  • Can alternatively be used with a pipe tee or flow cell in a sidestream installation
  • The sensors have concentric titanium electrodes separated by a PEEK insulator
  • Conductivity sensor has concentric titanium electrodes separated by a PEEK insulator
  • EPDM O-ring seals the internal parts of the conductivity sensor from the process liquid