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5.2 LDO water-saturated air (100%) calibration procedure
1. Fill a BOD bottle
¼ full with water.
5. Go to the
calibrate menu.
Select the probe, if
applicable.
Section 6 Sample measurement
The procedure that follows is applicable to meters that can connect to Intellical LDO probes. Refer to
the applicable meter documentation for meter operation and probe-specific settings.
6.1 Sample measurement notes
Read the notes that follow before sample measurements.
• Do not submerge the pressure sensor module.
• Salinity changes the solubility of oxygen in water. Measure the sample salinity and enter the value
in the probe settings of the meter.
• To decrease the measurement time, condition the probe and try different stir rates.
• Rinse the probe with deionized water and dry with a lint-free cloth between measurements to
prevent contamination.
• If complete traceability is necessary, enter a sample ID and operator ID before measurement.
Refer to the meter manual for instructions.
• The meter automatically saves the measurement data when the user manually reads each data
point and when the meter is set to read at regular intervals. The user must manually save each
data point when the meter is set to read continuously.
• Air bubbles below the sensor can cause a slow response or error in the measurement. Make sure
to remove air bubbles before and during measurements.
2. Put a stopper on
the bottle and shake
for 30 seconds.
6. Read the
dissolved oxygen
value. The display
shows 100% when
the reading is stable.
3. Rinse the probe
with deionized water.
Dry the probe with a
lint-free cloth.
7. Save the
calibration.
4. Put the probe in
the bottle. Wait
10 minutes or more
(30 minutes for best
results) for the
contents to adjust to
ambient
temperature.
English 7
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