Model 551 Four-Electrode Conductivity Sensor

The sensor mounts with Barben's 1 inch NPT Nut Lock union adapter. This allows for threadless installation and removal of the sensor for cleaning and calibration.

As the name suggests, four electrode sensors add an additional pair of electrodes to the two electrode sensor design. This second pair of electrodes provides sensor diagnostics which can then be used to compensate the measurement if scale or particulate build-up occur on electrodes. Four electrode conductivity sensors can withstand coating and scale which might otherwise foul a traditional two electrode sensor.