Vaisala WMS302 Podręcznik Użytkownika Pobierz pdf (Strona 226)

User's Guide ______________________________________________________________________

224 __________________________________________________________________M210630EN-B

Lead Batteries

The charger is capable of charging from 1.2 to 2.6 Ah, 6 V lead acid

batteries. There is room for one 1.2 Ah or 1.3 Ah battery in the logger

battery compartment, and with QMB102 you can add another 1.2/

1.3 Ah battery. If larger capacity is required, additional batteries must

be connected to the POWER connector terminals GND and +BATT.

Internal and external batteries can be present at the same time; they are

essentially paralleled. For protection, an automatic self-recovering fuse

is used.

To be able to charge the lead battery efficiently, the charger must know

the total capacity of the connected lead batteries. This capacity setting

is done with the following command:

battery [capacity]

Where capacity is the battery capacity in Ah. This value is also saved as

a static parameter and is not lost if the logger is reset or unpowered.

Primary Cells

Primary (non-rechargeable) cells from 6 to 9 V are most suitable for use

with the logger. The standard battery alternative for MAWS is a dual

cell lithium battery that has a nominal voltage of 7.2 V, a 35 Ah capacity

and a very wide temperature range. Common alkaline cells (4 to 6 cells

in series) in a suitable battery holder can be used as well.

These batteries do not generally fit into the internal battery

compartment. Therefore they have to be connected to the POWER

connector terminals GND and +BATT.

CAUTION

The battery protection fuse may trip if internal and external batteries

have very different charge states when connecting them. This is due to

current flowing from one battery to the other. This condition ceases

when the battery voltages reach a balance after one or several trip-

recover cycles.

CAUTION

If too large of a capacity value is used, the battery may be permanently

damaged due to excessive charge current.

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Vaisala WMS302 Podręcznik Użytkownika Strona 226