Calibration water-saturated air (100%) calibration – Hach-Lange HQD - Luminescent Dissolved Oxygen Probe LDO User Manual
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Calibration
Water-saturated air (100%) calibration
Calibration notes
•
Probes are initially calibrated at the factory. However, regular calibration by the user is
recommended for the best measurement accuracy.
•
To calibrate rugged probes, use a wide neck bottle or flask (such as a 250 mL
Erlenmeyer flask).
•
If the sensor cap is wet, carefully dry the cap with a nonabrasive cloth and put the
probe back in the bottle.
•
An additional zero point calibration can be added to the calibration routine. Refer to
Change calibration options on page 10
•
The slope value is the comparison between the latest calibration and the factory
calibration expressed as a percentage. If the calibration slope does not meet the
acceptance criteria, the display will show Slope out of range. Refer to
.
•
Data is stored automatically in the data log when Press to Read or Interval is
selected while in Measurement Mode. When Continuous is selected, data is stored
only when the Store key is pushed.
•
The calibration is recorded in the probe and the data log. The calibration is also sent
to a PC, printer or flash memory stick, if connected.
Before calibration:
The probe must have the correct service-life time stamp. Set the date and time in the meter before attaching the probe.
The LDO101 probe is factory calibrated, ships with an iButton-provided calibration and is ready for use. The factory
calibration will not allow a user calibration. To enable calibration, select User Cal as the Current Method in the LDO101
settings menu and follow the 100% (water-saturated air) procedures below.
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. If using
Factory Cal, a new method will need to be created.
To view the current calibration, select the DATA LOG key, View Probe Data, then View Current Calibration
Tighten the probe locking nut securely when connecting the probe to the meter.
For probes that are continuously immersed in aqueous solutions, condition the sensor cap for 72 hours. Refer to
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.
A new method can be created if custom calibration or measurement settings are desired.
Refer to
for calibration errors.
% saturation or mg/L calibration methods are available in the Modify Current Settings menu.