Additionally, the –ALK option provides backup power using a D cell alkaline battery pack.
However, the –ALK option does not include any charging functionality, and the alkaline batteries
will only be used when the voltage on the charge terminals is low or zero.
8.4 Humidity monitoring and control
Control moisture and humidity inside the enclosure to protect the CRVW3 electronics.
1. Install a humidity indicator card on the inside of the enclosure lid above the desiccant
holder.
2. Review the status of the indicator card during maintenance visits.
3. Replace the desiccant, and card when one or more circles on the card change from blue to
pink.
NOTE:
The
humidity
indicator
card
is
a
single-use
card
and
should
be
replaced
after
one
or
more
of
its
colo
u
red
circles
turn
pink.
8.5 Mounting the CRVW3 enclosure
The CRVW3 enclosure can be securely attached to a pole or other surface.
shows the CRVW3 with the –UM option installed.
Figure 8-5. –UM mounting option
CRVW3 3-Channel Vibrating-Wire Data Logger
45