Hach-Lange LDO10130 - Manual (Page 5)

Measurement procedure:
Note: Procedures also apply for rugged model probes.
1. Connect the
probe to the
meter. Make sure
that the cable
locking nut is
securely
connected to the
meter. Turn on the
meter. 2. Rinse the
probe cap with
deionized water.
Blot dry with a lint-
free cloth. 3. Put the probe
in the sample and
stir gently or add a
stir bar. 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. 4. Put the probe
in the sample at
least 25 mm
(0.984 in.) deep.
Push Read. The
display will show
"Stabilizing" and a
progress bar as
the probe
stabilizes in the
sample. The
display will show
the lock icon when
the reading
stabilizes. 5. Repeat steps
2-4 for additional
measurements.
When
measurements
are done, store
the probe
Storage
on page 10.
Auto salinity correction
Dissolved substances affect the amount of oxygen water can hold. Manually enter salinity
settings for the most accurate dissolved oxygen measurements or use the optional Auto
Salinity Correction feature.
The manufacturer recommends using the Auto Salinity Correction feature when
measuring dissolved oxygen in samples where salinity varies. Auto salinity correction
measures dissolved oxygen through the connection of one LDO101 probe and one
CDC401 conductivity cell (set to Salinity parameter). The value obtained by the
CDC401 conductivity cell automatically adjusts the salinity value for the LDO101 series
probe. Salinity units are represented as parts per thousand (ppt) or (º/ºº).
1. Connect the LDO101 probe and CDC401 conductivity cell to the HQd meter. Turn the
meter on.
Note: Security options must be turned off to use auto salinity correction.
2. Push and select the CDC401 Settings.
3. Select Current Method, Hach Salinity. Push OK.
Note: To change more measurement options, choose Modify Current Settings, change the
parameter to Salinity and any other desired settings.
4. Push EXIT until the Full Access Options menu is shown.
5. Select LDO101 Settings, Modify Current Settings, Measurement Options, Salinity
Correction: Off. Then select Sal Correction Mode: Off. Push the DOWN arrow to
select Auto (*) - Use CDC401. Push OK.
6. Push EXIT until the meter returns to the measurement mode. The HQ40d meter is
now set up to automatically use the salinity values obtained by the CDC401 with the
LDO101 probe. If the salinity value is out of range, the display will show *S= ----
above the dissolved oxygen reading as shown in
Figure 2 .
Note: The asterisk (*) indicates that salinity is automatically correcting the dissolved oxygen
value. No asterisk indicates that salinity is being manually corrected. Warning messages will
override the asterisk (*) priority.
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