4.1.2. Connect the DO electrode. Then Press key to power on the meter.
4.1.3. Choose DO unit: Hold to switch among mg/L, ppm and %. When the desired
unit shows up, release the button to confirm the unit selection.
4.1.4. Check the sponge
Check on the DO500 DO electrode: see picture (4-1). Screw off the bottom lid of electrode
calibration sleeve, inspect whether the sponge inside is moist. If it is dried out, add in several
drops of distilled water to the sponge to maintain the satured air inside the calibration sleeve
(Do NOT add too much water so it won’t be dripping).
4.1.1 Electrode polarization
After each power on, the DO electrode must be polarized for 5 minutes before measuring or
calibration. So do not to turn off the meter in the middle of your DO measurement. Otherwise,
you need to polarize the DO electrode again after next power on (The auto. power off
function in DO mode has been turned off by default).
How to polarize the DO electrode –– Just connect the DO electrode to the powered-on
meter without measuring or calibrating.
Electrode polarization is to consume the remaining oxygen inside the inner solution of the
membrane cap so as to ensure fast response and high accuracy. If a new membrane cap is
replaced, or new inner solution is added, the polarization time should be 30 minutes instead
of 5 minutes.
1 — DO500 DO electrode
2 — Calibration sleeve cap
3 — Calibration sleeve
4 — Water stored sponge
5 — Calibration sleeve bottom lid
6 — Tem p e r atur e el ectrod e
7 — Membrane cap
8 — Cathode (gold)
9 — Anode (silver)
10 — Salinity electrode
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