CRVW3 3-Channel Vibrating-Wire Datalogger
45
The main measurement output from a vibrating-wire sensor is a frequency (in
units of Hz or Digits) that corresponds to the natural resonance vibrations of
the wire element embedded within the sensor. This frequency changes as the
phenomenon being measured changes. It is important that you consult the
manual of your vibrating-wire sensor to document the highest and lowest
frequencies that are expected as output. Consider the most extreme conditions
of the phenomenon you are measuring. Then consider the highest and lowest
frequency that can be expected under both of those conditions. Using this
information, you will formulate both a low frequency value and high frequency
value that is configured into the CRVW3. This frequency range is used during
excitation and also during the read-back of the sensor. When exciting the
sensor, only energies within the specified frequency range are used for
excitation. When reading out the sensor’s response, only frequencies within the
window are processed, and frequencies outside the specified range are ignored.
This is one of the ways that the VSPECT technology filters unwanted noise out
of your vibrating-wire measurements.
Using
DevConfig
, make sure the following settings are properly configured:
•
Station Name
•
Measurement interval
•
PakBus Address
•
Is Router (should be set to “true” when the CRVW3 is also a radio
repeater device).
Then make sure that the following settings are properly set for each sensor
channel:
•
Channel Enabled
•
Channel Name
•
Excitation Voltage
•
Begin Frequency, End Frequency
•
Thermistor Enabled
•
Calculate Engineering Output
, for more details about
configuring and applying these settings. Consider saving the XML (*.xml)
configuration file on your laptop to store the settings as they were applied to
your device in the field.
When using the –RF451 radio option, there are some key settings
on the
Radio
and
Radio Advanced
tabs of
DevConfig
that should
be confirmed. See Section
Validating Radio Connectivity in
(p. 29)
, and Section
(p. 49)
.
8.2.8 Confirming CRVW3 Sensor Measurement Operation
Once the CRVW3 is properly installed at its permanent deployment site and
configured for operation, you should confirm (before leaving the site) that it is
measuring its sensors properly. This validation includes the use of a laptop
running
DevConfig
connected via USB cable.
NOTE
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