Campbell Scientific OBS-5+ Sediment Concentration Monitor and Pressure Sensor - Manual (Page 41)

OBS-5+ System
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.
Always put OBS-5+ to sleep for storage to conserve
battery capacity (see Section 6.2.13, Shutdown). CAUTION
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
(s)
10
100%
60
50%
60
100%
120
50%
120
100%
60 480 NO NO NO NO
600 > 3000 2050 780 1180 400
900 > 3000 > 3000 1100 2040 600
1800 > 3000 > 3000 1930 > 3000 1100
3600 > 3000 > 3000 > 3000 > 3000 1930
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
scratches.
2) Inspect O-rings for cuts and nicks; replace if necessary.
3) Clean O-rings and mating surfaces with a cotton swab and alcohol.
Remove fibers from groove and mating surfaces then grease O-rings
Molykote
® Compound 55 and reassemble.
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
® MCDC8M
pn 21122 Plug Locking Sleeve, Subconn ® MCDLSF
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