Measuring with Optical Dissolved Oxygen (DO) Probes 156
24.5.3. Clear Calibration
1. Press CAL to enter calibration mode.
2. CLR option is displayed for a few seconds.
3. Press CLR to clear previous calibration.
4. Press YES to confirm deletion. “Calibration Erased” message screen is displayed for a few seconds then
the controller returns to user calibration mode.
5. Press the
b (back) key to return to the menu.
Calibration Messages & Warnings
Message & Description Recommended Action
“Wrong Std”
The reading exceeds the expected
value. Calibration can not be
confirmed.
Check that correct calibration
solution has been used and / or
clean the probe.
“Temperature Error”
The temperature of the solution is out
of temperature compensation interval.
Use fresh calibration solution and / or
clean the temperature sensor.
MAINTENANCE
General Maintenance
• Inspect O‑ring for nicks or other damage. Replacing the o ring is advised.
• Do not substitute other grease or lubricants as it may cause the O‑ring to swell.
• After long‑term storage or cleaning, calibrate the probe.
• After use, rinse the probe with tap water and dry it.
• The DO cap must be kept hydrated.
Cleaning the Smart Cap
• Use a mild detergent and a soft‑bristled toothbrush to clean.
• Rinse with water after cleaning and dry with a laboratory tissue.
• Hydrate in purified water before use.
Note: Smart Caps need to be replaced every year.
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