appear. After injection, should check the electrolyte to see whether there are air
bubbles in it. If found there are air bubbles, please carefully knock on the
membrane cap to eliminate them.
(e) Put membrane cap on the table and put in the electrode vertically, slowly twist in
clockwisely, and then twist on tightly. Now the redundant electrolyte will be
squeezed out. Please wipe it off with tissue and clear it in distilled water.
(f) Check if there is any air bubbles in electrolyte (except for the smaller air bubbles), If
so, re-assembly is needed.
(g)Do not touch the sensitive membrane when using the electrode and replacing the
membrane cap because the sweat and grease of skin will affect the quality of the
membrane and decrease the rate of oxygen permeability.
4.7 Zero Oxygen Calibration
Generally, zero oxygen calibration is only needed when replacing a new electrode,
replacing membrane cap, or the electrode has not been used for a long time. Usually
there is no need to do zero oxygen calibration. To do zero oxygen calibration, follow
the next steps:
(a) Prepare 100mL of anaerobic water: In a 100 mL beaker, add 5g anhydrous sodium
sulfite (Na
2
SO
3
), add 100 mL distilled water, stir to dissolve. The anaerobic water is
effective within 24 hours.
(b) To polarize electrode by connecting it into meter for 15min, and then do calibration
according to the 4.2.1;
(c) Put the electrode into anaerobic water, press key to make the meter enter
calibration mode, when reading is ≤ 0.15mg/L (≤5min), press key again to
calibrate, then the LCD displays a flashing 0.0%, the calibration will be finished
after several seconds and the meter displays 0.00 mg/L, then wash the electrode
with distilled water;
(d) If the reading ≤0.02mg/L within 5 minutes, meaning the response speed of the
meter and residual current are good, and there is no need to do zero oxygen
calibration, press key to return to measuring mode.
(e) If the reading >0.15 mg/L after 5 minutes, meaning the response speed of meter is
slow and there is a lot of residual current, users can change the membrane cap or
remove the membrane cap and take out the polishing paper in the accessories to
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