© 2018 Valeport Ltd
Maintenance
Page 19
4.1. Changing Batteries
The MIDAS CTD+ Multi-Parameter Logger accepts 8 x D cells, of either 1.5V alkaline or 3.6V Lithium
type. These cells are arranged in series, so the output voltage is 12V (alkaline) or 28.8V (Lithium).
Some example scenarios for lifetime of these batteries are given in Chapter 2.4.2.
The batteries are located in a holder in the top of the instrument, and should be accessed by
removing the connector bulkhead.
1. Remove the instrument from the protective cage by loosening the M10 nuts on the polypropylene
clamps. Gently lever
these clamps apart,
using a screwdriver if
necessary.
2. Slide the instrument out of the cage, in either direction.
3. Remove the 3 M5 x 20 socket cap screws in the connector bulkhead, using the Allen key provided.
Note that these screws are titanium, and should be replaced with titanium screws if lost. Other
materials may suffer galvanic corrosion and may be destroyed.
4. Without twisting or putting undue stress on the SubConn
connector slide the bulkhead and attached battery pack
out of the main housing. A slot between the tube and
the bulkhead allows levering with a screwdriver if
necessary. Take care not to scratch the bore of the tube.
5. A lead connects the battery pack to the electronics inside
the tube. This may be disconnected at the battery pack if
required, for ease.
6. Replace the batteries.
7. Check the condition of the bore seal o-rings and apply a light coating of silicon grease. Ensure
that they sit in the groove correctly, and are free from damage. Replace them if necessary.
