9 Using the vLocPro2
Page 53 of 72
9.3
Applying the Transmitter’s Signal
The transmitter’s signal cable is applied in any one of the three ways:
9.3.1
Direct Connection
This is used on pipes or cables that are not live and do NOT carry hazardous voltages. The “Direct
connection” mode will be selected automatically when the connection leads are plugged into the transmitter.
WARNING
Never make a direct connection to live cables carrying hazardous voltages.
Do NOT plug the connection leads into the transmitter before connecting to the buried line and fixing the
ground stake.
Take the ground stake and push firmly into the ground and connect it to the black connection lead.
To make the signal travel further along the buried line, ensure to place the ground stake as far away as
possible, and at 90 degrees to the line. Where practical avoid having other buried lines between the ground
stake and the target line, this will reduce the chances of the transmitter signal coupling to another pipe or
cable.
Do NOT connect the black lead to any other metallic items that may have an above or below ground structure,
or to any other pipes or cables; connecting to such items would cause signals to radiate from these
secondary structures, which in turn will increase the likelihood of an incorrect locate.
Connect the red connection lead to the target line after removing any surface corrosion.
Plug the connection leads into the transmitter switch on and select the desired frequency.
WARNING
BE CAREFUL not to hit other buried lines when inserting the ground stake into
the ground. Check using passive location prior to inserting ground stake. Stop if
additional resistance is felt during insertion.
9.3.2
Clamp (Coupler)
This is used when applying the transmitter signal to cables carrying hazardous voltages, or cables where
access to the metallic conductor is not possible, or desirable. The “Clamp” mode is selected automatically
when the clamp is plugged into the transmitter.
For a clamp to work the current induced by the clamp must flow along the buried line. This means the buried
line must have a ground connection at both ends.
