CRVW3 3-Channel Vibrating-Wire Datalogger
36
FIGURE 8-7. Wiring Panel of the CRVW3
After performing some of the validation steps shown later in this section, you
will become confident that the sensor is being measured properly by the
CRVW3. Once that occurs, you can secure the gland into its permanent field
state. To do this, leave a slight amount of slack in the cable between the
terminals and the gland and reconnect the gland cap (which was previously
threaded onto the cable) on the outside of the enclosure and tighten it by hand
or with a wrench. Ensure that the seal of the gland contacts the cable evenly
around its circular connection to avoid any water ingress. Pull gently on the
cable to ensure that it does not slide or move through the gland.
Repeat the sensor connection process for up to two additional sensors, using
the terminals provided for those channels. After the device is powered (Section
(p. 36)
), tests can be performed to validate
that the CRVW3 is measuring the frequency and thermistor of the connected
vibrating-wire sensor properly (Section
(p. 45)
8.2.2 Providing Power to the CRVW3
Consider carefully how power will be provided to your CRVW3 station to
ensure reliable field operation.
If there is no electrical distribution grid power available at your CRVW3 site,
you must use a battery option to provide power to the device. Two main battery
options are available: –ALK and –RC.
A CRVW3 with a radio option requires more power. See Section
Validating CRVW3 Radio Operation
(p. 49)
, for information
on using the
DevConfig
Radio Power Schedule
tab to reduce the
amount of power consumed by the radio.
8.2.2.1 Alkaline D-Cell Option (–ALK)
If you selected the –ALK option when ordering your CRVW3, it uses alkaline
D-cell batteries for power. Eight cells are installed into the provided battery
pack. When using this option, no solar panel or charge mechanism is required.
However, visits to the site will be required on a regular basis to remove old
batteries and insert new ones. The length of time that the CRVW3 can operate
with one set of eight batteries depends on a number of factors. These factors
include which radio option is used (the –RF451 option requires more power
than the –RF407 option), how often measurements are made, how often radio
NOTE
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