11 maintenance, 1 desiccant, 2 replacing the internal battery – Campbell Scientific CR10X Measurement and Control System User Manual
Page 226
SECTION 14. INSTALLATION AND MAINTENANCE
14-10
14.11 MAINTENANCE
The CR10X Wiring Panel 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.
14.11.1 DESICCANT
The CR10X module is sealed and contains
desiccant to reduce humidity. When it is
necessary to open the CR10X module to
replace the lithium battery (Section 14.11.2), the
internal desiccant should be replaced with a
fresh pack. The Wiring Panel and the
connections between the Wiring Panel and the
CR10X are still susceptible to humidity. To
prevent corrosion at these points, additional
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.
14.11.2 REPLACING THE INTERNAL BATTERY
The CR10X module contains a lithium coin cell
battery that operates the clock and SRAM when
the CR10X is not connected to an external
power source. The CR10X does not draw any
power from the lithium battery while it is
powered externally. In a CR10X stored at room
temperature, the lithium battery should last
approximately 4 years (less at temperature
extremes). Where the CR10X is powered most
or all of the time the lithium cell should last
much longer.
While powered from an external source, the
CR10X 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 CR10X 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 14.11-1 lists
the specifications of the battery.
Table 14.11-1 CR10X 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 CR10X module must be disassembled to
replace the lithium cell. Disconnect the power
and remove the module from the wiring panel.
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CONTROL
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SW
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SWITHED
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12
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FIGURE 14.11-1. Removing Wiring Panel