RJM Equipment Sales, Inc 360-828-5732 [email protected]
Quick Locating Guide for Radiodetection RD8100 and RD7100
Guidance Mode: The easiest; center the gap in the bar and follow the arrows.
Peak & Null: Compare the bar & arrows to determine accuracy; trust the peak signal the most.
Null Mode may have more errors.
“Max V”: on “High” can increase the signal without increasing the increasing errors.
Automatic depth: Rotate the compass to straight up and move side to side above the cable or pipe.
Verifying depth: If the depth reading changes by the amount that you lift the locator, then it is accurate.
Ground Rod Placement: Select a rod location with no utilities between it and your utility.
Double ended connection: For challenging locates, connect both leads from the transmitter with an
extension lead to the utility.
Choosing Frequencies
Match the locator and transmitter frequencies. Use the lowest frequency that is strong enough.
Lower frequencies are potentially more accurate. Higher frequencies are stronger. Check the
mA display on the transmitter if direct connected to determine signal strength: 10mA
minimum, 20 – 30 mA typical. Common frequency choices:
Power cable with clamp: 33 Khz (8Khz better accuracy, higher for stronger signal)
Metal water mains: 33 Khz minimum
Locatable rodders: 33 Khz minimum
Tracer wire: 512 hz if grounded on other end, 33 Khz if not grounded on other end
Cable fault locating
:
1.
Locate the cable
2.
Connect black lead to ground stake and red lead to faulted conductor
3.
Select transmitter frequency with A-frame picture
4.
Connect A-frame. Turn on locator & it selects the A-frame frequency automatically.
5.
Hold
green
spike in front of the locator and follow the arrows.
6.
Check the whole cable. The numbers indicate the severity of the fault.
Sonde / Camera Locating
:
1.
Choose the same frequency as the sonde. Use sonde mode.
2.
Hold the bottom of locator parallel to the pipe or conduit.
3.
Locate the major and minor sonde peaks
Passive Frequencies
Search then search again at 90 degrees to first pattern.
Power: locates most utilities near a power cable with a load.
Radio: finds most metal utilities.
PASSIV: Power and Radio combined
CPS: Locates most metal gas pipes, some water mains
