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MODEL 404 WIRING
CLEANING THE SENSOR
The 404-17 (stainless steel body) sensor can be taken apart for cleaning. However, in some cases, disassembling and
reassembling the sensor can cause the cell constant to change as much as 1%. For maximum accuracy, the cell con-
stant should be rechecked after the sensor has been reassembled. The 400-16 (PVC body) sensor cannot be taken
apart.
Use a warm detergent solution and a soft brush or pipe cleaner to remove oil and scale. Isopropyl alcohol (rubbing alco-
hol) can also be used to remove oily films. Avoid using strong mineral acids to clean conductivity sensors.
CALIBRATION
ENDURANCE conductivity sensors are calibrated at the factory and do not need calibration when first placed in service.
Simply enter the cell constant printed on the label into the analyzer.
After a period of service, the sensor may require calibration. Because Model 404 sensors have a flow-through design,
they are best calibrated against a referee meter and sensor where the two sensors are connected in series with the
same liquid flowing through both.
For more information about calibrating contacting conductivity sensors, refer to application sheet ADS 43-024, available
on the Rosemount Analytical website.