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Rosemount™ 400VP Contacting Conductivity Sensor
rosemount 400 conductivity sensor
With the Rosemount 400VP general purpose contacting conductivity sensor, you will be able to accurately measure electrolytic conductivity in a broad range of applications from high purity water to clean cooling water.
The Rosemount 400 sensors are ideal for use in clean, non-corrosive liquid having less than 20,000 µS/cm.
Rosemount™ 400VP 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


  • A 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
  • The sensors are 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
  • Comes with Variopol (VP6) quick disconnect fitting
  • The sensors have concentric titanium electrodes separated by a PEEK insulator
  • An EPDM O-ring seals the internal parts of the sensor from the process liquid
  • Available with a high temperature option up to 392°F (200°C) with integral junction box