September
2017
Sentinel V SC and RT Operation Manual
Page 128
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Figure 66.
Thermistor and Pressure Sensor
Replacing the Desiccant
Desiccant is used to dehumidify the housing interior. Desiccant is essential in deployments with plastic
housings. The factory-supplied desiccant lasts a year at specified Sentinel V ADCP deployment depths and
temperatures. Remember that desiccant rapidly absorbs moisture from normal room air. As a minimum,
replace the desiccant whenever the ADCP housing is opened.
Do not open the desiccant bag. Contact with the silica gel can cause nose, throat and skin
irritation.
Do not puncture or tear the desiccant bag. Do not use desiccant bags that are torn or open
.
The Sentinel V ADCP housing has separate cavities for the battery and electronics. If the end-
cap is removed, only replace the end-cap desiccant.
To replace the end-cap side desiccant
:
).
2. Remove the new desiccant bag from the airtight aluminum bag.
3. Remove the old desiccant bag and install a new one. Use a short piece of double-stick tape and
place the desiccant bag on the end-cap as shown in Figure 49 and Figure 50. Ensure that the des-
iccant will not interfere with other components when the instrument is closed.
Remove the old desiccant with the end-cap away from the housing in case the bag rips.
4. Install the end-cap (see
).
5. Use the
panel to set the date the desiccant was replaced.
Normal maintenance does not require removing the transducer head
. If the transducer
assembly is opened, replace both the desiccant and O-ring.
