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c. Wait for the value to stabilize and push OK.
Note: The screen may advance to the next step automatically.
d. If applicable, enter the pH value and push OK.
11. 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.
12. Push OK.
13. 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.
5.3.4 ORP calibration procedure
Calibrate the ORP sensor with one reference solution (1-point calibration).
1. Put the sensor in the reference solution (a reference solution or sample of known value). Make
sure that the sensor portion of the probe is fully immersed in the solution
Figure 5 Sensor in reference solution
2. Select the main menu icon, then select Devices. A list of all of the available devices shows.
3. Select the sensor and select Device menu > Calibration.
4. Select 1-point value calibration (or 1-point manual correction).
5. 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.
6. With the sensor in the reference solution or sample, push OK.
The measured value is shown.
7. Wait for the value to stabilize and push OK.
Note: The screen may advance to the next step automatically.
8. If a sample is used for calibration, measure the ORP value of the sample with a secondary
verification instrument. Enter the measured value, then push OK.
9. If a reference solution is used for calibration, enter the ORP value marked on the bottle. Push OK.
(Figure
5).
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