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V1.0 September 2017
(Continued from page 5)
1.3 The measurement of tilt
The A axis is the primary axis and the B axis is the secondary axis. Uni-axial IPI
sensors only detect changes in the A axis.
After their installation, the vertical profile of the inclinometer casing is established
from the readings of individual IPI sensors. Changes to the verticality of a vertical or
inclined inclinometer casing (changes in the horizontal plane) are detected by the
sensor and the magnitude of the change is simply computed from the equation
'current reading - initial reading'. Horizontal IPI's detect vertical movement of the
inclinometer casing.
6
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