Specifications

Section 1. Installation and Maintenance
1-17
FIGURE 1.9-2. Power Switching without Relay
1.10 Maintenance
The CR3000 power supplies require a minimum of routine maintenance.
When not in use, the rechargeable supply should be stored in a cool, dry
environment with the AC charger active.
The alkaline supply should not drop below 11.0 V before replacement. When
not in use, remove the ten cells to eliminate potential corrosion of contact
points and store in a cool dry place.
1.10.1 Desiccant
The CR3000 is shipped with desiccant to reduce humidity. Desiccant should
be changed periodically. To prevent corrosion in uncontrolled or condensing
atmospheres, the CR3000 must be placed inside a weather tight instrument
enclosure with desiccant. Do not completely seal the enclosure if lead acid
batteries are present. Hydrogen gas generated by the batteries may build up to
an explosive concentration.
1.10.2 Replacing the Internal Battery
Misuse of the lithium battery or installing it improperly can
cause severe injury. Fire, explosion, and severe burn
hazard! Do not recharge, disassemble, heat above 100°C
(212°F), solder directly to the cell, incinerate, nor expose
contents to water.
The CR3000 contains a lithium battery that operates the clock and SRAM
when the CR3000 is not powered. The CR3000 does not draw any power from
the lithium battery while it is powered by a 12 VDC supply. In a CR3000
stored at room temperature, the lithium battery should last approximately 3
CAUTION