Sea-Bird Electronics SBE 38 Manual do Utilizador descarregar pdf (Página 15)

Manual revision 006 Section 2: Description of SBE 19plus V2 SBE 19plus V2

Batteries

For the main battery, the SBE 19plus V2 uses nine D-cell alkaline batteries

(Duracell MN 1300, LR20), or rechargeable Nickel Metal Hydride (NiMH) or

Nickel-Cadmium (Ni-Cad) batteries. If necessary, carbon-zinc or mercury cells

can be used.

On-board lithium batteries (non-hazardous units that are unrestricted for

shipping purposes) are provided to back-up the buffer and the real-time clock in

the event of main battery failure or exhaustion. The main batteries may be

replaced without affecting either the real-time clock or memory.

Battery Endurance

The standard alkaline battery pack has a nominal capacity of 14 amp-hours;

for planning purposes, Sea-Bird recommends using a conservative value of

10.5 amp-hours. The optional NiMH battery pack has a nominal capacity of

8 amp-hours. The optional Ni-Cad battery pack (no longer available) has a

nominal capacity of 4.4 amp-hours.

Current consumption and sampling times vary greatly, depending on:

• instrument configuration - inclusion of optional SBE 5T or 5P pump and/or

auxiliary sensors, and

• user-programmed sampling parameters - Profiling or Moored mode;

if in Moored mode, the pump mode, number of measurements per sample,

and delay before sampling influence power consumption.

Examples are shown below for several sampling schemes for both Profiling and

Moored mode. For Moored mode, you can use the Deployment Endurance

Calculator to determine the maximum deployment length, instead of

performing the calculations by hand.

Profiling Mode Examples

Example 1 - standard alkaline batteries, SBE 5M pump, no auxiliary sensors

Sampling current = 70 mA (from Specifications)

Pump current = 100 mA (from Specifications)

Maximum sampling time ≈ 10.5 amp-hours / (0.070 amps + 0.100 amps) ≈ 61 hours

Example 2 - standard alkaline batteries, optional SBE 5T pump, auxiliary sensors drawing 100 mA

Sampling current = 70 mA (from Specifications)

Pump current = 150 mA (from Specifications)

Auxiliary sensor current = 100 mA

Maximum sampling time ≈ 10.5 amp-hours / (0.070 amps + 0.150 amps + 0.100 amps) ≈ 32 hours

Notes:

• See Specifications for power

requirements.

•

If the 19plus V2 is logging data and

the battery voltage is less than the

battery cut-off, the 19plus V2 halts

logging and displays a low battery

indication in the data. See

BatteryType= command in

Command Descriptions in Section 4:

Deploying and Operating SBE

19plus V2 for cut-off values for

various battery types.

•

See Data Storage and Specifications

for data storage limitations.

Notes:

• See Replacing / Recharging

Batteries in Section 5: Routine

Maintenance and Calibration.

• As of 2011, the Ni-Cad battery pack

and charger are no longer available.

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