Vaisala WMS302 Guía de usuario descargar pdf (Pagina 224)

User's Guide ______________________________________________________________________

222 __________________________________________________________________M210630EN-B

4. Modify the wiring according to Table 42 on page 222.

5. Connect the signal cable to the modified connector.

Charging of Internal Battery

The data logger has an internal battery charger circuitry that has a

programmable charging voltage of 4.5 to 9.9 V and four selectable

current limits: 100 mA, 300 mA, 500 mA, and 700 mA. The MAWS

charger is capable of handling 6 V lead batteries from 1.2 Ah up to

2.6 Ah.

Charging voltage and charger input voltage (+ExtDC) can be measured

with 1 % accuracy and charging current can be measured with 5 %

accuracy. The charger is protected against reverse input voltage and

temperature. In addition, it has internal reverse current blocking to

facilitate using solar cells without a blocking diode.

Power Supply and Battery Types

Battery Sensing

When the logger first starts or resets, it tries to sense the battery type that

is connected to its internal battery connector (4-pin header connector at

PCB near POWER connector). This connector has two sense pins that

Table 42 Modified Wiring with QFM101

Wire

Color

Standard Connection

Pin at the Logger

Modified Connection Pin at the

Logger

Red Not connected. Connect the wire to the terminal C of the

selected temperature measurement

channel (CH4 ... CH7).

Brown E Leave as is. This wire is used for the

moisture measurement.

White H Leave as is. This wire is used for the

moisture measurement.

Black L Move the wire to the terminal E of the

selected temperature channel (CH4 ...

CH7).

Blue C Leave as is. This wire is used for the

moisture measurement.

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Vaisala WMS302 Guía de usuario Pagina 224