CRVW3 3-Channel Vibrating-Wire Datalogger
40
charged) during those times when grid power is available. It is also possible to
use the –ALK option for backup power. In that case, the D-cell alkaline battery
pack will be drawn upon for power only when the voltage on the charge
terminals is low or zero. No charging of the batteries occurs with the –ALK
option.
8.2.3 Humidity Monitoring and Control
To ensure proper operation of the CRVW3, steps can be taken to control
moisture and humidity conditions inside of the enclosure. Approximate
humidity history can be tracked for analysis during maintenance visits to the
site.
Install the humidity indicator card (pn 28878 included with CRVW3 shipment)
by attaching it using the included backing tape. Place it on the inside of the
enclosure lid above the desiccant holder. Review the status of the indicator
card when maintenance visits are made to the CRVW3 site.
Ensure a fresh desiccant package (pn 4905 included with CRVW3 shipment) is
inserted into the desiccant holder. Note that the
Quick Deploy Guide
is also
kept in the desiccant holder. Additional desiccant packs can be ordered from
Campbell Scientific when needed.
Humidity conditions can vary widely among CRVW3 deployment locations
and associated weather conditions. Monitor the state of the humidity indicator
card in order to determine when a replacement desiccant pack is needed.
Humidity history from a weather station near the CRVW3 may also be helpful
in predicting desiccant maintenance schedules.
8.2.4 Mounting the CRVW3 Enclosure
The enclosure of the CRVW3 can be securely attached to a pole or other
applicable mounting hardware. Use the supplied mounting kit (option –SM,
included with CRVW3 shipment) or the Universal Mounting Bracket (pn
30840, –UM option, shown in FIGURE
) to secure the CRVW3 enclosure
at its permanent location.
FIGURE 8-12. CRVW3 with the –UM mounting option
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