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2.1 Consumables

2.1.1 Logger

Depending on the memory size typically the logger fills within four and a half months to two

years. When full the logger will continue logging by selectively overwriting data (RDT-files,

not SDT-files) using the smallest significant wave height as a selection criterion. To prevent

this, a filled logger flash card should either be replaced or its contents moved timely. For

example a 128 Mb logger flash card will store 4.7 months of north, west, vertical displacement

data before it starts to overwrite previously logged smallest significant wave height files. See

section 5.12 for further details.

2.1.2 Batteries

As a self-sufficient system Datawell buoys are equipped with batteries. All batteries used by

Datawell are made by Datacell SA. Table 2.2.1 lists the type, energy content and number of the

batteries per buoy model.

Table 2.2.1. Battery type, energy content and number per buoy model.

Buoy model Battery type Energy

content (Wh)

Number Total energy

content (Wh)

WR-SG 0.9 m RC25G* 250 26 6500

WR-SG 0.7 m RC25G* 250 13 3250

DWR-MkIII 0.9 m RC20B 200 45 9000

DWR-MkIII 0.7 m RC20B 200 15 3000

DWR-G 0.9 m RC25G* 250 65 16250

DWR-G 0.7 m RC25G* 250 32 8000

DWR-G 0.4 m RC25GS* 250 4 1000

DWR-G 0.4 m RC16R 160 4 640

*magnetic, not to be used in DWR-MkIII

All Waverider buoys are fitted with an onboard energy consumption meter that measures

the energy consumed from the batteries. By this means the operational life, the time left for the

buoy in operation before the batteries become exhausted, is determined. In case of a hybrid

buoy, the life time is calculated based on the batteries only.

The operational life can be obtained via a terminal request over the console, subsection

5.11.5, or from the system file transmitted via the HF radio link, subsection 5.7.3. The energy

consumption meter reading will not be affected when the buoy is temporarily not in operation.

Only after a user setbat command it will initiate a new count down. Table 2.2.2 lists the

operational life of the various standard buoy models.

Table 2.2.2. Operational life of standard buoys (minimum).

Buoy model

(standard)

Operational life

(years)

WR-SG 0.9 m 2.6

WR-SG 0.7 m 1.3

DWR-MkIII 0.9 m 3

DWR-MkIII 0.7 m 1

DWR-G 0.9 m 2

DWR-G 0.7 m 1

DWR-G 0.4 m 30 days

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 122 123

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