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SECTION 14. INSTALLATION AND MAINTENANCE
14-4
FIGURE 14.3-1. PS12 12 Volt Power Supply and Charging Regulator
TABLE 14.3-1. Typical Alkaline Battery
Service and Temperature
Temperature (°C) % of 20°C Service
20 - 50 100
15 98
10 94
590
086
-10 70
-20 50
-30 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.
The five foot external battery cable can be
connected to a large capacity (amp-hour) battery to
power the system for an extended period of time.
The red and black leads connect to the positive and
negative battery posts, respectively. The alkaline
cells act as a power backup in this case. A diode in
the PS12ALK isolates the lead acid supply from the
alkaline batteries.
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 CR10 while float
charging the lead acid batteries. The internal
lead acid battery powers the datalogger if the