Hach pH Manuel D'utilisation page 16

10. Review the calibration result:
• PASS—The sensor is calibrated and ready to measure samples. The slope and/or offset
values are shown.
• FAIL—The calibration slope or offset is outside of accepted limits. Repeat the calibration with
fresh reference solutions. Clean the sensor if necessary. Refer to
on page 18.
11. If the calibration passed, push confirm.
12. Return the sensor to the process, then push confirm.
The output signal returns to the active state and the measured sample value is shown on the
measure screen.
4.3.3 ORP calibration procedure
Calibrate the ORP sensor with one reference solution or a sample of known value.
1. Put the sensor in the reference solution or sample. Make sure that the sensor portion of the probe
is fully immersed in the solution. Refer to
Figure 9 Sensor in reference solution or sample
2. Push menu, then select SENSOR SETUP > [Select Sensor] > CALIBRATE.
3. Select 1 POINT MANUAL.
4. If the passcode is enabled in the security menu for the controller, enter the passcode.
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 confirm.
The measured value is shown.
7. Wait for the value to stabilize, then push confirm.
8. Enter the ORP value of the reference solution or sample.
Note: If a reference solution is used for calibration, find the ORP value on the reference solution bottle. If a
sample is used for calibration, measure the ORP value with a secondary verification instrument.
9. Review the calibration result:
• PASS—The sensor is calibrated and ready to measure samples. The slope and/or offset
values are shown.
• FAIL—The calibration slope or offset is outside of accepted limits. Repeat the calibration with a
fresh reference solution. Clean the sensor if necessary. Refer to
on page 18.
16 English
Figure 9.
Clean the sensor
Clean the sensor