Charles Machine Works Inc The 8500TKR ユーザーズマニュアル

The 8500 tracking system uses a magnetic field generator in an 850 series beacon and two receiving 
antenna pods in an 8500TK advanced tracker to determine beacon position. The tracker detects the 
generated magnetic field and calculates the beacon’s position. Downhole information is relayed from the 
beacon to the tracker. The tracker sends all received and calculated data to a remote display over a radio 
link.

The dual antenna pod design provides the ability to approach the beacon location without encountering 
ghost signals and can determine the beacon’s location and heading. When placed along the intended bore 
path, the tracker can be used in Drill-Thru mode to provide the beacon’s current depth, projected depth at 
the tracker location, horizontal distance (range) and horizontal steering correction.

The 8500TK locates the beacon plane 
perpendicular to the center of the beacon. Once 
the tracker is within range of the beacon and within 
the beacon plane, the advanced depth calculations 
of the tracker are enabled. 

The beacon plane extends outward from the center 
of the beacon and runs perpendicular to the 
beacon as shown. Because of this, the ground 
level location may be slightly in front of or behind 
the true vertical position of the beacon’s center. 
This is only apparent at extreme pitches and 
increasing depths. For example, at 30’ (9 m) deep 
and 10% pitch, the beacon plane and vertical plane 
will be approximately 3’ (914 mm) apart at ground 
level. The tracker calculates this difference and 
presents it in the depth mode side view.

Beacon plane: side view

Beacon plane: top view