Vaisala MAWS201 User's Guide download pdf (Page 174)

User's Guide _______________________________________________________________________

172 __________________________________________________________________ M210243en-A

Primary Cells

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

use with QML102. The standard battery alternative for MAWS is a

dual cell lithium battery that has nominal voltage of 7.2 V, 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 QML102 internal battery

compartment so they have to be connected to the POWER connector

terminals GND and +BATT.

NOTE

Short pins 3 and 4 in QML102 internal battery connector with jumper

or preferably use a special pin header for correct battery type sensing.

If the primary cell setting is detected, the charger circuitry of QML102

is completely shut off to protect the battery from reverse currents.

CAUTION

Never connect voltages higher than 10 V between terminals +BATT

and GND as this may damage the QML102 electronics.

Lead Battery Charger Operation

The charger has three operating modes when a lead battery is detected:

Normal Charge, Quick Charge and Float Charge. When MAWS starts,

it first checks the battery type and if lead is found the charging task

starts and is performed once a minute.

NOTE

If the internal temperature of the QML102 is found to be below -20

°C, the charging current is limited to 100 mA regardless of the battery

capacity.

Normal Charging

At first, the charging task always enters Normal Charging mode. In

Normal Charge, charging voltage is set to 6.85 V corrected with

temperature coefficient. Charging current is set to 300 mA, 500 mA,

or 700 mA depending on battery capacity.

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Vaisala MAWS201 User's Guide Page 174