Section 6 Sample Measurement; Sample Measurement Notes; Sample Measurement Procedure - Hach LBOD101 User Manual

Section 6 Sample measurement

The procedure that follows is applicable to meters that can connect to Intellical LBOD 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.
• Salinity changes the solubility of oxygen in water. Measure the sample salinity and enter the value
in the probe settings of the meter.
• High concentrations (more than 1 molar) of acids or bases will decrease the service life of the
LBOD sensor cap.
• 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.

6.2 Sample measurement procedure

1. Rinse the probe
with deionized water.
Dry the probe with a
lint-free cloth.
5. Read the
dissolved oxygen
value of the sample.
The display shows
the dissolved oxygen
value when the
reading is stable.
8 English
2. Put the probe in
the BOD sample.
3. Tap the probe to
remove air bubbles.
4. Start the stirrer.