9
PROBE CABLE
The cable is used to control the depth of the inclinometer probe. It also
conducts power and data between probe and reel.
•
Metric probe cables have half-meter graduations with labels every
meter. The first graduation is 0.5 meters from the top wheels of
the probe.
•
English probe cables two-foot graduations with labels every
four feet. The first graduation is 2 feet from the top wheels of the
probe.
How to negate plotting errors
The Digital Inclinometer Pro system displays readings as mm or inches
of tilt, and this reading applies at the depth of the top wheel set pivot
point.
The Soil Instruments standard inclinometer along with inclinometer
systems from some other manufacturers use cable markers that are
spaced from the middle of the probe (mid-probe datum systems), but
this has some unexpected effects when the readings are plotted.
Digital Inclinometer Pro system has been designed to negate these
plotting errors.
If you are using your Digital Inclinometer Pro system in new boreholes
then the following does not apply.
However if you use a Digital Inclinometer Pro in a Borehole that has
previously been read using a mid-probe datum inclinometer you will
see anomalies in the data plots when comparing the previous borehole
runs with the new borehole runs.
There are a number of options of how to negate these
anomalies:
Option 1
•
Take a new datum set and exclude the previous data runs from
the plot.
Option 2
•
Add a 250mm section of casing to the borehole which will
position the new probe in the same positions in the borehole as
the original probe.
•
the 250mm value may need adjusting for differences in cable
support gates.
IMPORTANT
INFORMATION
