putting in new desiccant. While the lid is off the enclosure, compare the internal enclosure
humidity to the air humidity. Replace if > 10% off.
7.1.4.1 Procedure for removing RH chip
1. Unscrew the protective cap (see
2. Hold the plastic sides of the RH chip and unplug it.
CAUTION:
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.
7.1.5 Data logger module
The data logger module contains a lithium battery that operates the clock and SRAM when the
module is not powered. The data logger does not draw power from the lithium battery while it is
powered by a 12 VDC supply. In an WS-PRO2 stored at room temperature, the lithium battery
should last approximately 10 years (less at temperature extremes). Where the WS-PRO2 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 data logger Status Table has a “Lithium Battery” field. This field shows lithium battery voltage.
Send the WS-PRO2 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 WS-PRO2 will still operate correctly while
powered. Without the lithium battery, the clock will reset and data will be lost when power is
removed.
CAUTION:
Campbell Scientific recommends factory replacement of the lithium battery. Misuse of the
lithium battery in the data logger or installing this lithium battery 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.
(p. 70) lists the specifications of the battery.
Section 7. Maintenance and troubleshooting
69
Summary of Contents for WS-PRO2
Page 9: ...FIGURE 3 4 WS PRO2 bottom layer Section 3 Initial inspection 5...
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