ET107 Weather Station
62
6.1.4.1 Procedure for Removing RH Chip
1.
Unscrew the protective cap (see FIGURE
2.
Hold the plastic sides of the RH chip and unplug it.
To prevent scratching, avoid touching the silver chip, and
handle the RH chip with care.
3.
Rinse off the RH chip with distilled water or dispose of the old RH chip.
4.
Hold the sides of the rinsed or new chip and plug it in.
5.
Screw on the protective cap.
6.1.5 CR1000M Module
The CR1000M Module contains a lithium battery that operates the clock and
SRAM when the module is not powered. The CR1000M does not draw power
from the lithium battery while it is powered by a 12 Vdc supply. In an ET107
stored at room temperature, the lithium battery should last approximately 10
years (less at temperature extremes). Where the ET107 is powered most or all
of the time, the lithium cell should last much longer.
While powered from an external source, the module measures the voltage of
the lithium battery daily. This voltage is displayed in the status table. A new
battery will have approximately 3.6 volts. The CR1000 Status Table has a
“Lithium Battery” field. This field shows lithium battery voltage.
Send the ET107 enclosure to Campbell Scientific to have Campbell Scientific
replace the battery when voltage is approximately 2.7 V (see
page).
If the lithium cell is removed or allowed to discharge below the safe level, the
ET107 will still operate correctly while powered. Without the lithium battery,
the clock will reset and data will be lost when power is removed.
Campbell Scientific recommends factory replacement of the
lithium battery. Misuse of the lithium battery or installing it
improperly can cause severe injury. It is a 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. Lithium batteries
need to be disposed of properly.
lists the specifications of the battery.
TABLE 6-1. CR1000 Lithium Battery Specifications
Manufacturer
Tadiran
Model
TL-59025 (3.6 V)
Capacity
1.2 Ah
Self-discharge rate
1%/year @ 20°C
Operating temperature range
–55 to 85 °C
CAUTION
CAUTION