Hach-Lange HQD - BOD LDO Probe LBOD - Manual (Page 3)

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Calibration
Water-saturated air (100%) calibration
Water-saturated air (100%) calibration notes:
• Probes are initially calibrated at the factory. However, regular calibration by the user is
recommended for the best measurement accuracy.
• If both 0% and 100% calibration is desired, select User 100% with 0 from the
Calibration Options menu.
• If the calibration slope does not meet the acceptance criteria, the display will show
Slope out of range. Put the probe back in the BOD bottle and allow additional time
for the air environment to become saturated with water. Select Read.
Before calibration:
The probe must have the correct service-life time stamp. Set the date and time in the meter before attaching the probe.
It is not necessary to recalibrate when moving a calibrated probe from one HQd meter to another if the additional meter is
configured to use the same calibration options. If the additional HQd meter uses different calibration options (e.g. calibration
standards or acceptance criteria), calibrate the probe or change the method settings to select a different method.
To view the current calibration, select the DATA LOG KEY, View Probe Data, then View Current Calibration.
If any two probes are connected, push the UP or DOWN arrow to change to the single display mode in order to show the
Calibrate option.
Analyze samples as soon as possible after collection.
Tighten the probe locking nut securely when connecting the probe to the meter.
If custom calibration or measurement settings are desired, a new method can be created.
Refer to Troubleshooting on page 10 for calibration errors.
Connect the HQd meter to AC power so the battery life is conserved. See the HQd user manual for instructions.
The slope value is the comparison between the latest calibration and the factory calibration expressed as a percentage.
% saturation or mg/L calibration methods are available in calibration options menu.
1. Connect the
probe to the meter.
2. Rinse the
sensor cap with
deionized water and
blot dry.
3. Fill a BOD bottle
about ¾ full with
water (225 mL.)
4. Put the stopper
in the BOD bottle
and shake
repeatedly. Remove
the stopper.
5. Inspect the
LBOD probe sensor
surface. If it is wet,
blot dry with a
non-abrasive cloth.