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Troubleshooting Conductivity Sensors on a CBW

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Troubleshooting Conductivity Sensors on a CBW
Troubleshooting helps and How to check the calibration of the sensor.
Wiring documentation comes in the box with the part. It is attached here as well. The purposes of the wires are detailed in Figure 3 of the attached file Rosemount Conductivity Probe 226.pdf. Figure 4 of this file shows how the probe is wired at the 1056 Rosemount analyzer.

Check the Sensor

  1. Make sure the sensor is covered with water.
  2. Make sure the sensor is free of any deposits. It should be clean.
  3. Check for sensor damage or cable damage by checking the resistances of the cable leads. Note you will have to lift the leads from the Rosemount 1056 analyzer to do the resistance checks. Resistances should be per Figure 13 and Table 1 of Rosemount Conductivity Probe 226.pdf.

Check the Calibration

  1. Calibrate the sensor by immersing it into a known solution.
  2. The calibration will be done in place using a reference sensor that is simultaneously measuring the same water as the CBW mounted conductivity sensor. The reference sensor can be a hand held conductivity sensor such as from Oakton or similar manufacturer. This reference sensor must first be checked against a known calibration buffer solution to verify its accuracy. The known buffer can be purchased through Grainger or through Milnor.

Configure the 1056 analyzer upon first use (Guide Attached Below)

  1. Use Section 4 to set your display language.
  2. Use Section 5.3.2 to set temperature units and set temperature compensation to automatic.
  3. Use Section 5.4 to set outputs 1 and 2 range to 0-20mA.
  4. Use Section 6.5 to set the Toroidal Conductivity Measurement Parameters. Set meter type to 226 and leave all other choices as default.

Calibrate the Sensor using Figure 7-3 from the 1056 Guide Below

  1. Calibrate Zero calibration.
    1. Pull sensor out and have it in air.
    2. Make sure the sensor is clean.
  2. In Process Calibration, wait for a stable reading and press enter.  If using a reference meter, take a sample measurement with the reference sensor. Input the value to the analyzer.
CBW Conductivity Sensors
Purpose of Conductivity Sensors for a CBW
 

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