Installing the 3TB in a borehole
4. Attach the lifting loop to the sensor using four M5×16 screws (provided).
5. Join the loop to the bottom of the strain relief mechanism or surge-
suppressor sonde using the linking cable provided.
6. Using a small winch, hoist up the sensor package and strain relief
mechanism until both are hanging by the lifting cable, with the strain relief
mechanism extended. If not using a separate surge-suppressor sonde,
tighten the cable clamps on the strain relief unit, allowing a little slack in the
signal cable.
7. Fix the signal cable to the main lifting cable about one metre above the strain
relief mechanism using a cable clamp (a nylon cable tie may be sufficient for
shallow installations). Leave a little slack in the signal cable between the
clamp and the strain relief mechanism.
8. Position the assembly over the top of the borehole. Do not allow it to drag
across the ground.
23
Issue G - November 2019
