Emerson PN 51A-404 instruction sheet Cleaning the Sensor, Calibration

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.

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