Hach 8398 Serie Manual Del Usuario página 10

4.3.7 Calibration with the process sample
Calibrate the sensor while the sensor is installed in the process sample. As an alternative, put the
sensor in a grab sample collected from the process sample.
Note: Before the sensor is calibrated for the first time, complete a zero calibration.
1. Select the main menu icon, then select Devices. A list of all of the available devices shows.
2. Select the sensor and select Device menu > Calibration.
3. Select Calibration again.
Note: Use the Measurement type setting to change the parameter that is calibrated.
4. Select the option for the output signal during calibration:
Option Description
Active The instrument sends the current measured output value during the calibration procedure.
Hold The sensor output value is held at the current measured value during the calibration procedure.
Transfer A preset output value is sent during calibration. Refer to the controller user manual to change the
preset value.
5. With the sensor in the process sample, push OK.
The measured value is shown.
6. Wait for the value to stabilize and push OK.
Note: The screen may advance to the next step automatically.
7. Measure the conductivity (or other parameter) value with a secondary verification instrument. Use
the arrow keys to enter the measured value and push OK.
8. Review the calibration result:
• "The calibration was successfully completed."—The sensor is calibrated and ready to measure
samples. The slope and/or offset values are shown.
• "The calibration failed." —The calibration slope or offset is outside of accepted limits. Repeat
the calibration with fresh reference solutions. Clean the sensor if necessary.
9. Push OK to continue.
10. Return the sensor to the process and push OK.
The output signal returns to the active state and the measured sample value is shown on the
measurement screen.
4.3.8 Calibration with a reference solution
Calibration adjusts the sensor reading to match the value of a reference solution. Use a reference
solution that is at the same value or higher than the expected measurement readings.
Note: Before the sensor is calibrated for the first time, complete a zero calibration.
1. Thoroughly rinse the clean sensor in deionized water.
2. Put the sensor in the reference solution. Support the sensor so that it does not touch the
container. Make sure that the sensing area is fully immersed in the solution . Stir the sensor to
remove bubbles.
3. Wait for the sensor and solution temperature to equalize. This can take 30 minutes or more if the
temperature difference between the process and reference solution is significant.
4. Select the main menu icon, then select Devices. A list of all of the available devices shows.
5. Select the sensor and select Device menu > Calibration.
6. Select Conductivity solution.
Note: Use the Measurement type setting to change the parameter that is calibrated.
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