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Application |
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Inclinometer casing controls the orientation of the
inclinometer probe. If the casing is twisted, the orientation of the probe
will vary, and the resulting data will indicate an incorrect magnitude of
movement in the A and B directions. The spiral sensor checks for spiral and
provides measurements that can be used to correct inclinometer data obtained
from spiraled casing. |
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Although not required for most inclinometer
installations, spiral surveys are recommended when:
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The installation is very deep.
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Inclinometer readings indicate movement in an unlikely
direction.
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Extreme accuracy is required.
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Difficulties were experienced during installation of
the casing.
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Operation |
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The spiral sensor, connected to an inclinometer control
cable and read-out, is lowered to the bottom of the casing. Spiral readings
are recorded at 1.5-meter (or 5-foot) intervals as the sensor is drawn to
the top of the casing. Readings are displayed in arc minutes. In a full
spiral survey, the sensor is drawn through the casing four times, with its
orientation changed 90 degrees each time. |
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Data Reduction |
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If spiral correction is required, the data is processed with specialized
software such as Slope Indicator's DigiPro program. DigiPro calculates the
spiral correction required at each inclinometer reading depth, and then
applies the correction when it generates a graph or report. |
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Advantages |
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Checks Installation: The spiral sensor can
be used to verify that casing was installed properly, without spiral.
Improves Accuracy: Spiral correction can
improve accuracy and ease interpretation of data. In some cases, spiral
correction allows continued use of inclinometer casing that would otherwise
be abandoned or replaced.
Works with Digitilt System: The spiral
sensor is compatible with inclinometer control cable and Digitilt
indicators. No additional equipment is required. |
| * Click to download
datasheet [Spiral
Sensor][Manual] |
