Campbell Scientific ET107 Evapotranspiration Monitoring Station - Manual (Page 77)

ET107 Weather Station
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. 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.
The lithium battery contained inside of the ET107’s canister is Campbell
Scientific part number 13519. TABLE 4-1 lists the specifications of the
battery.
TABLE 4-1. 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°C to 85°C
4.2 Troubleshooting
4.2.1 No Response Using the CR1000KD Keypad
Check keypad response after each of the following steps.
A. Make sure the battery has been installed and the PS100 power switch is set
to “ON” (Section 2.8, Battery Installation).
B. Use a voltmeter to measure the voltage on the 12 V and G terminals (see
FIGURE 2-48); the voltage must be between 9.6 and 16 Vdc.
Use a voltmeter to measure the voltage on the 5V and G terminals (see
FIGURE 2-48); the voltage must be between 4.9 – 5.1 Vdc.
C. Disconnect the Temp/RH sensor from the back of the enclosure.
D. Disconnect the 9-pin ribbon cable from any communication option used
with the station so that only the keypad is attached to the 9-pin plug in the
lower right hand corner of the enclosure.
CAUTION
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