Typical Alkaline Battery Service And Temperature; Bpalk Power Supply - Campbell CR510 Operator's Manual

TABLE 14.3-1. Typical Alkaline Battery
Service and Temperature
Temperature (°C)
20 - 50
15
10
5
0
-10
-20
-30
NOTE: This data is based on one "D" cell
under conditions of 50 mA current drain
with a 30 ohm load. As the current drain
decreases, the percent service improves for
a given temperature.
14.3.2 PS12LA LEAD ACID POWER SUPPLY
The PS12LA power supply includes a 12 V, 7.0
amp-hour lead acid battery, a AC transformer
(18 V), and a temperature compensated
charging circuit with a charge indicating diode.
An AC transformer or solar panel should be
connected to the PS12 at all times. The
charging source powers the CR510 while float
charging the lead acid batteries. The internal
lead acid battery powers the datalogger if the
FIGURE 14.3-1. BPALK Power Supply
% of 20°C Service
100
98
94
90
86
70
50
30
SECTION 14. INSTALLATION AND MAINTENANCE
charging source is interrupted. The PS12LA
specifications are given in Table 14.3-2.
The two leads from the charging source can be
inserted into either of the CHG ports, polarity
doesn't matter. A transzorb provides transient
protection to the charging circuit. A sustained
input voltage in excess of 40 V will cause the
transzorb to limit voltage.
Some solar panels are supplied with a
connector, this connector must clipped off so
the two wires can be inserted into the two
terminal ports. It is recommended that these
two leads be stripped and tinned.
The red light (LED) on the PS12LA is on when a
charging source is connected to the PS12LA
CHG ports. The switch turns power on and off
to the 12 V ports, battery charging still occurs
when the switch is off.
CAUTION: Switch the power to "off" before
disconnecting or connecting the power
leads to the Terminal Strip. The Terminal
Strip and PS12LA are at power ground. If
12 V is shorted to either of these, excessive
current will be drawn until the thermal fuse
opens.
14-3