BT2 user manual - H-5911-9004-02-B Page | 44
6.7 Steel cable
The steel cable is supplied with all Boretrak2 units. This cable should be used for deployments along any borehole
steep enough for gravity to pull the probe to the bottom of the hole. For shallower holes, or holes drilled horizontally
or uphole, the steel cable is not suitable. In these cases, a push rod system should be used.
The standard cable is 50m long. For deployments down boreholes longer than 50m, contact Carlson Software to
enquire about cables of different lengths.
A threaded brass cap on the end of the steel cable provides a connection point for the deployment adaptor.
The steel cable is marked along its length by steel nodules. These are arranged in the order:
• longer nodule = 2m and subsequent even metre intervals
• round nodule = 1m and subsequent odd metre intervals
With the Boretrak2 probe connected to the cable, the first nodule along the cable from the probe is exactly 1 m from
the tip of the Boretrak2 nose cone.
On the other end of the steel cable a clip gives the option to attach the wire to a belt or fixed object in case there is
concern that the probe might be dropped down the borehole.
The steel wire is supplied wound into a coil and packed into a cable bag.
Figure 48 Longer nodule at odd metre intervals
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