Specifications

Section 1. Installation and Maintenance
1-18
years (less at temperature extremes). Where the CR3000 is powered most or
all of the time the lithium cell should last much longer.
While powered from an external source, the CR3000 measures the voltage of
the lithium battery daily. This voltage is displayed in the status table
(Appendix A) A new battery will have approximately 3.6 volts. The CR3000
Status Table has a “Lithium Battery” field indicating the current value of the
lithium battery. This value is updated in the background calibration. If the
lithium cell is removed or allowed to discharge below the safe level, the
CR3000 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 (part number
13519). Table 1.10-1 lists the specifications of the battery.
TABLE 1.10-1. CR3000 Lithium Battery Specifications
Model Tadiran TL-59025 (3.6 V)
Capacity 1.2 Ah
self discharge rate 1%/year @ 20°C
Operating temperature range -55°C to 85°C
The CR3000 must be partially disassembled to replace the lithium cell.
Figures 1.10-1 to 1.10-5 illustrate how to disassemble the CR3000. Reverse
these steps to reassemble the CR3000. Disconnect any external power source
wired into the Power In plug and/or set the power switch to the off position
before proceeding with the lithium battery replacement.
The battery is held in place by a plastic cover. It can be removed by gently
prying the cover from the battery holder.