Hach-Lange HQD - BOD LDO Probe LBOD - Manual (Page 8)

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with this name to distinguish them from the default method settings, which cannot be
changed. A saved method can be used instead of repeatedly adjusting individual settings.
Changes made to a user defined method are automatically saved with the existing name.
Multiple methods can be saved for the same probe.
1. Make sure a probe is connected to the meter.
2. Push the METER OPTIONS key and select (Probe Model) Settings.
3. Select Modify Current Settings.
4. Select Units to change the units between mg/L (default) and % (both are displayed on
Reading screen).
5. Select Measurement Options.
6. Update the settings. Refer to Table 2 ..
Table 2 Measurement settings options
Setting Options Description
Resolution
0.1—Fast (0.35 mg/L)/min
0.01—Fast (0.35 mg/L)/min
0.01—Medium (0.15
mg/L)/min (default)
0.01—Slow (0.05 mg/L)/min
The resolution affects the number of decimal places and
the stabilization time. Higher resolution measurements take
more time to stabilize.
Measurement limits
Lower limit (default: 0.0
mg/L; 0%)
Upper limit (default: 20.0
mg/L; 200%)
The measurement limits can be set to match the acceptable
values for the sample. When the measurement is above the
upper limit setting or below the lower limit setting, the meter
will show an "Out of limits" message. This message is an
alert to a potential problem with process conditions.
Salinity correction
Off (default)
Manual
Salinity lowers the solubility of dissolved oxygen in water.
To correct for salinity in the sample, set salinity correction
to manual and then enter the salinity value.
Salinity value ‰ (default: 35.0 ‰)
When salinity correction is set to manual, enter the salinity
value of the sample. Salinity can be measured with a
conductivity probe.
Pressure units
hPa
mBar
inHg
or mmHg
The meter shows the atmospheric pressure at the current
elevation, which is necessary for accurate measurements.
This pressure reading will not agree with readings from
sources such as weather stations, which report atmospheric
pressure at sea level.
Averaging interval
Off
30 s
60 s
90 s
3 min
5 min
The averaging interval is useful for samples that contain a
lot of air bubbles, for example in an aeration basin. The air
bubbles cause the dissolved oxygen readings to vary greatly
from one reading to the next. To make the readings more
consistent, increase the averaging interval. The meter will
take measurements at the same frequency but show only
the average over a longer interval.
Note: Labels and options may vary depending on units selected.