Hach D5500 Série Manuel De L'utilisateur page 13

instrument uses the user-entered atmospheric pressure or altitude, the
salinity and the temperature to determine the reference value.
During calibration, data is not sent to the datalog. Thus, the datalog can
have areas where the data is intermittent.
Calibration with air
Air calibration is recommended for best accuracy and repeatability.
1. Remove the sensor from the process.
2. Use a mild soap solution and wet cloth to clean the sensor membrane.
Rinse thoroughly with distilled water.
3. Put the membrane end of the sensor in a calibration bag with a few
drops of water and tighten the bag around the sensor body. Refer to
Figure 9.
Figure 9 DO sensor in calibration bag
4. Push the MENU key and select Sensor Setup, [Select Sensor],
Calibrate.
5. Select Air Cal and push ENTER.
6. If the passcode is enabled in the security menu for the controller, enter
the passcode.
7. 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.
8. With the sensor in the calibration bag push ENTER.
9. Wait for the value to stabilize and push ENTER.
10. Review the calibration result:
• Pass—the sensor is calibrated and ready to measure samples.
• Fail—the value is outside of accepted limits. Refer to
on page 15 and Troubleshooting
information.
11. If the calibration passed, push ENTER to continue.
12. If the option for operator ID is set to Yes in the Calibration Options
menu, enter an operator ID. Refer to
on page 15.
13. On the New Sensor screen, select whether the sensor is new:
Option Description
Yes The sensor was not calibrated previously with this controller. The
days of operation and previous calibration curves for the sensor are
reset.
No The sensor was calibrated previously with this controller.
14. Return the sensor to the process and push ENTER.
The output signal returns to the active state and the measured sample
value is shown on the measure screen.
Note: If the output mode is set to hold or transfer, select the delay time when the
outputs return to the active state.
Calibration with the process sample
The sensor can remain in the process sample, or a portion of the process
sample can be removed for calibration.
Maintenance
on page 16 for more
Change calibration options
English 13