Apera Instruments DO803 Manual

APERA INSTRUMENTS DO803 Optical Dissolved Ox ygen Probe

1. Probe Structure

The instruments DO803 optical dissolved oxygen probe has a cable length of 3m and
built-in temperature sensor for automatic temperature compensation. The electrode
structure is shown in Fig.-6
1. Bottom cover of the calibration sleeve
2. Sponge for water storage
3. Sensor cap
4. Calibration sleeve

2. Probe Maintenance

The sensor cap of the optical DO electrode must be kept in a moist environment. If the
surface coating of the sensor cap dries out, the measured value will be unstable or the
response will be slow. The electrode calibration sleeve is used to store the probe.
(A) Short-term storage (less than 30 days): The probe head is kept in the calibration
sleeve. Always keep the sponge inside the calibration sleeve wet. Several
drops of clean water should be added to a dry sponge (let the sponge be
saturated, but not dripping), and tighten the lock cap, so that the sensor cap is
kept in the moist-saturated air.
(B) Long-term storage (greater than 30 days): The probe head is kept in the calibration
sleeve. Check whether the water storage sponge is moist every 30 days or user can
store the electrode in a beaker containing water.
Fig.-6
5. Locking cap
6. Optical DO electrode
7. O ring
Immersion line:
The tested solution should be above this line