Hach-Lange HQD - Luminescent Dissolved Oxygen Probe LDO - Manual (Page 6)

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2. Push METER OPTIONS and select the CDC401 Settings.
3. Select Current Method then Hach Salinity. Select OK .
Note: To change additional measurement options, choose Modify Current Settings, change the
parameter to Salinity and any other desired settings.
4. Push EXIT until returned to the Full Access Options menu.
5. Select the LDO101 Settings, Modify Current Settings, Measurement Options,
Salinity Correction: Off, then Sal Correction Mode: Off. Arrow down to Auto (*) -
Use CDC401 and select 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= ----. This
will appear 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.
Maintenance
Storage
Dry storage is recommended when the probe is used for measurements of short duration
(less than 6 hours). Wet storage is required for monitoring periods longer than 6 hours.
During the initial 72 hours of submersion in tap water, calibrate once every 8 hours. After
72 hours of storage in tap water, the sensor cap will reach a fully hydrated state. The need
for recalibration is minimized if the sensor cap is kept wet. Rugged probes may be stored
with the shroud installed if the storage container is sufficiently large.
Sensor cap maintenance
Sensor cap replacement is required every 365 days or more often if the cap becomes
damaged or fouled. The meter will display a reminder message when 30 days of sensor
service life remain on the cap. For LDO sensor cap replacement instructions, refer to the
instructions provided with the LDO sensor cap replacement kit.
Rugged probe maintenance
The shroud protects the sensor elements during rugged applications. Damage to the
sensing elements can occur if the shroud is not installed during field use. Damage under
these conditions is not covered under warranty. Before a rugged probe can be cleaned,
the shroud must be removed. Install the shroud after the probe is clean.
Figure 2 Salinity value out of range