Campbell Scientific CR510 Basic Datalogger - Manual (Page 171)

SECTION 14. INSTALLATION AND MAINTENANCE
14-9
14.10 MAINTENANCE
The CR510 Terminal Strip and power supplies
require a minimum of routine maintenance.
When not in use, the PS12LA should be stored
in a cool, dry environment with the AC charging
circuit activated.
The BPALK alkaline supply should not drop
below 9.6 V before replacement. When not in
use, remove the eight cells to eliminate potential
corrosion of contact points and store in a cool
dry place.
14.10.1 DESICCANT
To prevent corrosion, desiccant must be placed
inside the enclosure. If only alkaline batteries
are inside the enclosure, the sensor lead
entrance may be plugged to inhibit vapor
transfer into the enclosure. Do not plug the
entrance if lead acid batteries are present.
Hydrogen gas generated by the batteries may
build up to an explosive concentration.
14.10.2 REPLACING THE INTERNAL BATTERY
The CR510 contains a lithium coin cell battery
that operates the clock and SRAM when the
CR510 is not connected to an external power
source. The CR510 does not draw any power
from the lithium battery while it is powered
externally. In a CR510 stored at room
temperature, the lithium battery should last
approximately 4 years (less at temperature
extremes). Where the CR510 is powered most
or all of the time the lithium cell should last
much longer.
While powered from an external source, the
CR510 measures the voltage of the lithium
battery daily. This voltage is displayed in the
∗
B
Mode window 8 (Section 1.6) and in response
to the telecommunications status command
(Section 5). A new battery will have
approximately 3 volts. The battery should be
replaced when the voltage drops below 2.4
volts. If the lithium cell is removed or allowed to
discharge below the safe level, the CR510 will
still operate correctly while powered. Without
the lithium battery, the clock will reset and data
will be lost when power is removed.
A replacement lithium battery can be purchased
from Campbell Scientific or from an Electronics
store (e.g., Radio Shack). Table 14.10-1 lists
the specifications of the battery.
Table 14.10-1 CR510 Lithium Battery
Specifications
Model CR2430
Capacity 270 mAhr
self discharge rate 1% of capacity/yr.
Diameter 24.5 mm
Thickness 3.0 mm
Temperature range
Operating -20 to 60
°
C
Storage -40 to 60
°
C
The CR510 module must be disassembled to
replace the lithium cell. Disconnect the power
and remove the back plate to expose the coin
cell battery.
The coin cell is held in place by a spring clamp.
It can be removed by grabbing the edge of the
cell with your fingers or by inverting the circuit
board and lifting the spring clip with a fingernail
until the cell falls out.
DESI PAK
SPE CIF ICAT ION MIL -D-3 464 T
YPE & II
REA CTIV ATIO N T IME IN GA B 16 HO URS AT 2 50 F 0
DESIC CAN T ACTIV ATE D BAGG ED FO R CON TEN TS 1/6 UNIT
PA CKAG E U SE AND STA TIC
DEH UM IDIFICA TIO N
DO N OT E
AT
UNITE
D D ESIC
CAN
TS-G
ATE
S
P.O . B OX 105 B
ELEN , N EW MEXICO
87002
DESI PAK
SPE CIF ICAT ION MIL -D-3 464 T YPE & II
REA CTIV
ATIO N T IME IN GA B 16 HO URS AT 2 50 F 0
DE SIC CA NT AC TIVAT ED BA GGED FO R CON TEN TS 1/6 UNIT
PA CKAG E U SE AN D STA TIC
DEHU MIDIFIC ATIO N
DO N
OT E AT
UNITE
D D ESIC
CAN
TS-G
ATE
S
P.O. B OX 105 B EL EN , N EW ME XICO 87002
FIGURE 14.10-1. CR510 Lithium Battery
Location
The new cell is slipped into place under the clip,
the negative side toward the circuit board and
the positive side touching the clip. Replace the
desiccant taped to the circuit board holder with
a fresh packet before reassembling the CR510.