Vaisala WMS302 Guide de l'utilisateur télécharger pdf (Page 229)

Chapter 8 ____________________________________________________________ Technical Data

VAISALA______________________________________________________________________ 227

Temperature Protection

The charger protects lead batteries from extreme temperatures by

limiting the charge current or shutting the charger completely off under

certain conditions. This helps to prolong expected battery life.

If the internal temperature of the logger rises higher than +50 °C

(122 °F), the charger shuts completely off and battery status shows

"CHARGE_OFF".

When the internal temperature of the logger drops below -20 °C (-4 °F),

the charging current is limited to 100 mA to avoid unnecessary gas

generation. Lead type batteries do not accept charging energy well at

low temperatures. They loose the excess energy by generating gas. This

may shorten the battery life. Normally, the 100 mA limit should not

cause any problems, as the average current consumption of the logger

is much lower.

NOTE

Battery manufacturers strictly forbid charging of their lead batteries

above +50 °C (122 °F).

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Vaisala WMS302 Guide de l'utilisateur Page 229