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Operating instructions

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16 OI/ADS430–EN Rev. A | Aztec ADS430 | Optical dissolved oxygen probe
21. Press the key (below the Continue prompt).
The Calibrate page is displayed:
22. When zero calibration is complete, a results
page is displayed:
23. Press the key (below the Exit prompt).
The Calibrate page is displayed:
24. Press the key (below the Back prompt).
The Calibrate page is displayed:
25. Press the key (below the Exit prompt) to
return to the Operator page.
26. Once the calibration is complete, remove the sensor from
the chamber and rinse thoroughly to remove all of the
sodium sulphite.
6.4 Abort calibration
A calibration is aborted by pressing the key below the Abort
prompt displayed on the Calibrate pages (refer to transmitter
Operating instructions OI/AWT440-EN). The Calibration Log
displays the message Cal Aborted – refer to OI/AWT440-EN for
Calibration Log entries.
6.5 Calibration timings
6.5.1 Stability period
The temperature and concentration readings are monitored for
up to 10 minutes until a stable reading is achieved. When
stability is achieved, the calibration (slope and offset) values
are determined.
6.5.2 Slow probe response
If the output from the probe does not stabilize during the
Stability Period the calibration is not accepted and a Cal Failed
diagnostic is displayed, the Calibration Log is updated with a
Cal Failed message.
6.6 Calibration troubleshooting – slow sensor calibration or no
response to dissolved oxygen changes
1. Check probe configuration / recalibrate probe – refer to
Section 6, page 11.
If the fault persists:
2. Clean the sensor cap and lens – refer to Section 7,
page 17.
If the fault persists:
3. Replace the sensor cap – refer to Section 9, page 19.
If the fault persists:
4. Replace the probe.