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MODEL 400 and 400VP WIRING
WIRING THROUGH A JUNCTION BOX
Model 400-60 sensors have a junction box mounted on the end of the sensor. See Figure 14 for wiring instructions.
If wiring connections are made through a remote junction box (PN 23550-00), wire point-to-point. Use cable 23747-00
(factory-terminated) or 9200275 (raw cable).
FIGURE 14. Sensor-Mounted Junction Box Wiring
NOTES:
1. THE GRAY SENSOR WIRE IS CONNECTED TO THE JUNCTION BOX,
WHICH MAKES ELECTRICAL CONTACT WITH THE OUTER ELECTRODE.
2. TERMINALS IN JUNCTION BOX ARE NOT NUMBERED. REFER TO
ANALYZER WIRING DIAGRAM FOR CONNECTIONS AT ANALYZER.
FIGURE 15. VP pin-out (viewed from connector end of
sensor, looking down)
PIN OUT DIAGRAM FOR 400VP
CLEANING THE SENSOR
Use a warm detergent solution and a soft brush or pipe cleaner to remove oil and scale. Isopropyl alcohol (rubbing
alcohol) 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. The sensor can be calibrated against a solution having
known conductivity or against a referee meter and sensor. If using a standard solution, choose one having conduc-
tivity in the recommended operating for the sensor cell constant. Refer to the analyzer manual or product data sheet
for recommended ranges. Do not use standard solutions having conductivity less than about 100 uS/cm. They are
susceptible to contamination by atmospheric carbon dioxide, which can alter the conductivity by a variable amount
as great as 1.2 uS/cm (at 25°C). Because 0.01/cm sensors must be calibrated in low conductivity solutions, they are
best calibrated against a referee meter and sensor in a closed system.
For more information about calibrating contacting conductivity sensors, refer to application sheet ADS 43-024, available
on the Rosemount Analytical website.