Campbell Scientific CR10 CR10 Measurement and Control - Page 195

Supply and Charging Regulator, Temperature, TABLE 14.3-1. Typical Alkaline Battery, Service, case.,

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SECTION 14. INSTALLATION AND MAINTENANCE 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 5 90 0 86 _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 seruice 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 PSl2ALK isolates the lead acid supply from the alkaline batteries. 14.3.2 PS12LA LEAD ACID POWER SUPPLY The PS12LA power supply includes a12Y,7.O 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 io the PS12 at alltimes. The charging source powers the CR10 while float charging the lead acid batteries. The internal lead acid battery powers the datalogger if the charging source is interrupted. The PS12LA specifications are given in Table 14.3-2. 14-3

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SECTION
14.
INSTALLATION AND MAINTENANCE
FIGURE
14.3-1.
PS12
12
Volt
Power
Supply and Charging Regulator
Temperature
('C)
20-50
15
10
5
0
_10
_20
-30
TABLE 14.3-1. Typical Alkaline Battery
Service
and TemPerature
%
of
20"C
Service
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
PSl2ALK
isolates
the
lead acid supply from the
alkaline
batteries.
14.3.2
PS12LA LEAD ACID
POWER
SUPPLY
The
PS12LA power supply
includes
a12Y,7.O
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
io the
PS12 at
alltimes.
The
charging
source powers
the
CR10 while
float
charging
the
lead acid
batteries. The
internal
lead acid battery powers the datalogger
if
the
charging
source is
interrupted. The
PS12LA
specifications are given
in
Table
14.3-2.
100
98
94
90
86
70
50
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 seruice improves
for
a given temperature.
14-3