BT2 user manual - H-5911-9004-02-B Page | 52
Rods are stacked in a rod rack. The rod rack can fit up to 36 rods, arranged in two stacks of 18. The rod at the
bottom of each stack is fitted with a female quick-release joint. This joint can connect to the rod on the top of the
next stack which is fitted with a male quick-release joint.
To connect the quick-release joints, the two rods must be held at 90° angles. The pin in the male joint is then pushed
into the hole in the female joint. Once the rods are straightened out beyond 90°, the joint is locked. To disconnect
the rods, they must again be held at a 90° angle and pulled apart.
For longer deployments, further racks full of rods can be used. The rods form each stack join together in the same
way as described above.
To allow the rods to be pushed, the rods are joined with uni-directional uphole links which prevent them from
doubling back on themselves.
When using the probe uphole, the length of the deployment may be restricted due to the weight of the system or
the condition of the borehole. Uphole deployment is only suitable for narrow boreholes less than 100 mm diameter.
Figure 62 Quick release joint
Figure 63 Uni-directional uphole link
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