Frequencies For Pipes; M Dyna-Coupler - 3M Dynatel 2250M-iD Series Operator's Manual

Frequencies for Pipes

Metal pipes (gas, water) with non-metallic joints will typicaly locate best with 8
kHz or higher. The lowest frequency may not travel past the first non-metallic
joint.
In some cases where there are several non-metallic joints along the path, it is
suggested that:
• High output is used.
• Special Peak is used when signal becomes weak.
Relative Current
When a single frequency is selected then you will also see the relative
current toggle with the frequency. This number can be matched to the
relative current estimated by the receiver during a depth reading and
used to verify locate path.
"ALL" Frequencies
The transmitter can output 577 Hz, 8 kHz and 33 kHz at the same time
by pressing the Trace Key until All is displayed.
3M Dyna-Coupler (Transmitter)
TM
! WARNING
This WARNING applies to the following 3M
• 3" (75 mm) - Part number 3001
• 4.5" (114 mm) - Part number 4001
• 6" (150 mm) - Part number 1196
• All accessory kits containing any of the listed 3M Dyna-Couplers - Part
numbers 3019, 4519, 1196/C
A potential for electrical shock exists when using the 3M Dyna-Coupler on
cables energized with electrical power. Use appropriate safety procedures.
DO NOT USE ON CABLES CARRYING IN EXCESS OF 600 VOLTS RMS.
Equipment Used
3M™ Dynatel™ 3W US Transmit-
ter, 2250M
1. Use the Coupler Cable to connect the transmitter to the Dyna-
Coupler.
2. Select 8 kHz or 33 kHz.
3. Press High Output to transmit a 3 Watt signal.
78-9237-1692-8
Dyna-Couplers:
™
3M™ Coupler Cable 9011
11
3M™ 3" Dyna-Coupler,
3001