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DO reading accuracy improvements
DO (Dissolved Oxygen Galvanic type) ELECTRODE MAINTENANCE
ERROR CODES
If the electrode reading is not at (or very close to) zero in oxygen-free Dl water, then polish the tip (cathode) of the
electrode. If the electrode readings are not within the normal ranges given above, or the electrode reading drifts,
inspect the Membrane Module. If it is visibly torn, punctured, or fouled, replace the Membrane Module. Then follow
the Electrode Preparation procedure. If the electrode response is still outside the normal range after this procedure,
please contact the manufacturer's technical service department.
Some considerations to get accurate measurements with your DO electrode include:
• DO measurements are very dependent on barometric pressure, temperature and salinity factors. If your meter allows
for inputs on these factors, make sure you use them correctly and accurately.
• Replace the DO electrolyte and calibrate the DO electrode when your measurements seem to be drifting, or
inaccurate.
• Replace the Membrane Module if it becomes fouled by the sample, or if it gets torn or punctured.
• Follow the Electrode Storage procedure to get the best life from your DO electrode.
Proper maintenance ensures faster measurements, improve accuracy and may extend the lifetime of
the electrodes.
When not in use—Long term
For long term storage or to take the electrode out of service, disconnect the electrode from the meter.
Disassemble the electrode membrane cap. Rinse the anode, cathode and membrane cap assembly with distilled
water. Blot the anode and cathode elements with a clean lab wipe.
Shake the membrane cap assembly to expel the DI water. The Membrane Module should be stored WITHOUT
0.5M NaoH electrolyte to prevent the galvanic depletion of the electrode’s anode.
Thread the membrane cap assembly loosely onto the body of the electrode. Do not tighten.
Place the electrode in the box, away from direct sunlight.
When not in use—Short term(Over night or the weekend)
The DO electrode should be stored in DI water to prevent electrolyte evaporation.
It is better to disconnect the galvanic DO electrode from the meter when not in use.
Probe head replacement:
When electrode response time to be longer and displaying value appear obviously error, or when sensitive
membrane of DO electrode has a wrinkle, crack or damaged, should replace a membrane.
Q1: Wrong temperature
A1:
Refer to page 3 (
TEMPERATURE ELECTRODE TYPE SELECTION
), you must use the correct temperature sensor type
or adjust temperature manually (Long press
UNIT
button then press
UNIT
to select “
not
”).
Q2: Meter shows erratic readings
A2:
Make sure electrode and meter are well connected, or it must be sensor failed, or power is weak.
Code
Description
OL2
Measurement is out of range of the display.
Troubleshooting
TROUBLE SHOOTING
