Hach LDO10101, User Manual, Page: 9 / 16

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.
• Make sure to install the shroud before field use to prevent damage to the sensing elements. Refer
to Remove or install the shroud on page 9. The probe warranty does not include such damage.
• To deploy a rugged probe at a distance, toss the probe body with a slow underhand throw. Do not
throw the probe by the cable to prevent damage to cable, the probe or the user.
6.2 Sample measurement procedure
1. Rinse the probe with
deionized water. Dry
the probe with a lint-
free cloth.
Rugged probes: install
the shroud.
2. Put the probe in the
sample 25 mm (1 inch)
or more. Do not put the
probe on the bottom or
sides of the container.
Stir the sample at a
moderate rate or put
the probe in flowing
conditions.
3. Shake the probe
from side to side to
remove air bubbles.
Rugged probes: move
the probe up and down
to remove air bubbles.
4. Stir gently, then read
the dissolved oxygen
value of the sample.
The display shows the
dissolved oxygen value
when the reading is
stable.
Section 7 Maintenance
7.1 Clean the probe
N O T I C E
The LDO sensor cap has a protective black layer to increase the life of the LDO sensor. Do not rub the black layer
to clean the LDO sensor cap. Do not use alcohol or other organic solvents to clean the LDO sensor cap.
Keep the LDO sensor cap clean for best results. Use only water and neutral detergents to clean the
probe.
English 7