Geokon 6300, Instruction Manual, Page: 11 / 24

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2.2.2 Biaxial System
The biaxial sensors are delivered unattached to the wheel assembly and to each other. The
upper sensor should be attached to the wheel assembly using the two 10-32 nuts and cap
screws supplied. The tongue of the sensor fits inside the slot of the wheel assembly with
the orientation set such that the A+ direction marked on the sensor is aligned on the same
side as the fixed wheel on the wheel assembly. (Tilts in the positive direction yield
increasing readings in digits).
The adaptor piece is now bolted to the bottom of the sensor using a single 10-32 cap
screw and thread locking compound (Loctite 222).
Figure 5 - Biaxial sensor assembly
Two short cap screws are used to attach the lower sensor via this adaptor with its positive
direction (Marked A+ on the sensor body) at 90° clockwise from the upper sensor (in plan
looking down the casing). This will be the B+ direction. See Figure 6.
Figure 6 - Biaxial Sensor Orientation
Note that there is some clearance around the bolt holes which will allow for some
manual alignment of the sensors (absolute alignment is not critical).
When the two sensors are connected, the lower one is joined to the previously prepared
gauge tube.
Vibrating wire tilt sensors are shipped with a clamp screw holding the
internal pendulum mechanism so that it is not damaged in shipment. A label is
attached to each sensor emphasizing the importance of removing the slotted-head
clamp screw completely and replacing it with the Phillips-head seal screw taped to
the sensor. (Extra seal screws are provided in a zip-lock bag along with other
accessories in case some become lost). This is very important for the sensor to be
able to respond to tilting and remain waterproof.
Fixed Wheel
Instrument Cable
A+
B+
Instrument Cable