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9.3
Batteries
The unit runs on three, C-size, alkaline batteries. Buy the expensive ones with
the longest expiration date ("use before May 20XX"). While operating
continuously, the OBS-5+ will run 125 hours (15, eight-hour surveys) in
Survey Mode and for as long as 3,000 hours in the Cyclic Mode.
CAUTION
Always put OBS-5+ to sleep for storage to conserve
battery capacity (see Section 6.2.13, Shutdown).
Refer to FIGURE 6-2 for battery installation. Battery life will depend on the
percentage of time the unit is sampling. TABLE 9-1 shows battery life as a
function of sample duration and interval to assist with planning your sampling
schedule (see Power in Section 6.2.9, Sampling Modes and Terms).
TABLE 9-1. Battery Life in Hours with 100% Power
Interval
600
900
1800
3600
9.4
Pressure Housing
The pressure housing and O-ring seals require little maintenance other than
careful inspection every six months and service before moored deployments.
1) Disassemble O-ring seals and inspect mating surfaces for pits and
2) Inspect O-rings for cuts and nicks; replace if necessary.
3) Clean O-rings and mating surfaces with a cotton swab and alcohol.
9.5
User-Serviceable Parts
Alkaline C cells and the components of the 21304 Accessory Kit can be
purchased as replacement parts. Campbell Scientific manufacturing part
numbers and product descriptions follow:
pn 20993 End-cap O-ring, Parker 2-136
pn 20989 Optic Bushings O-ring, ARP5 7.5 X 1.2 mm OBN
pn 21141 S.S. End-cap Screws, 5/16" X 3/8"
pn 21120 Dummy Plug, Subconn
pn 21122 Plug Locking Sleeve, Subconn
10
60
(s)
100%
50%
100%
60
480
NO
> 3000
2050
> 3000
> 3000
> 3000
> 3000
> 3000
> 3000
> 3000
scratches.
Remove fibers from groove and mating surfaces then grease O-rings
®
Molykote
Compound 55 and reassemble.
60
120
120
50%
100%
NO
NO
NO
780
1180
400
1100
2040
600
1930
> 3000
1100
> 3000
1930
®
MCDC8M
®
MCDLSF
OBS-5+ System
33
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