Direct Connection Mode - SubSurface Instruments PL-2000 Operation Manual

OPERATION IN THE FIELD
(B)
2
"Tick" "Tick"
27kHz 8kHz
0.5kHz
MIX
"Tick"
27kHz is chosen automatically
when the Power Switch is turned on.
Poor
Ground POOR
(B)
Good
Ground
(B)

4. DIRECT CONNECTION MODE

(A) 5
3 4
The .Direct .Mode .is .usually .preferred .if .
the pipeline or a fitting, like a hydrant, is
exposed . .
1 . . .Plug .the .Direct .Connection .Mode .cables .
into .the .Transmitter .at .the .connector .on . .
its .side . .Connect .the .clamp .of .the .red .
cable .to .the .pipeline .at .a .hydrant .bolt, .and .
connect .the .black .cable .to .the .ground .
stake, .Locate .the .ground .stake .adjacent .
to .the .pipeline, .10-15 .feet .away .
2 . . .Set .the .output .mode .at .DIR .for .Direct .Mode .
3 . . .Choose .a .frequency .from .among .the .four .
available .27kHz, .8kHz, . .5kHz, .or ."Mix" .
(all .3), .using .these .considerations . .
• . . For .water .pipelines .and .other . .
gasketed .pipes, .choose .27 .kHz .or .
8 .kHz . .In .different .systems, .one .fre-
quency .will .be .better .than .the .other .
• For .continuous .conductors .like .cop-
per .service .lines .and .steel .gas .lines,
choose . .5 .kHz .
• For .certain .conductors, .choose ."Mix ."
4 . . .Set .up .the .Power .Output .Level .with .the .
up/down .arrow .keys .
5 . . .Check .the .Transmitter .display .for .good .
ground .conductivity .and .good .clamp .con-
nections .on .the .red .cable .and .the .black .
cable . .If .2 .or .3 ."ground .symbols" . .
are .shown, .the .current .transmitted .to .the .
line .is .good . .If ."poor .ground" .is .displayed, .
improve .the .clamp .contact .at .the .red .
cable .or .move .the .black .cable .and .ground .
stake .to .a .new .location .
20
Ground Stake.
Black Cable.
OPERATION IN THE FIELD
Finding the Optimum
Transmitter Location
In .the .Direct .Mode, .the .location .of .the .
ground .stake .can .be .critical .to .locating .the .
line .accurately . .
Red Cable.
1 . . .The .ground .stake .should .be .located .to .
the .side .of .the .pipeline .and .as .far .away .
from .it .as .possible .in .order .to .maximize .
the current flow in the line. The ground
stake .should .not .be .located .past .the .end .
of .the .line .or .close .to .an .elbow . .If .these .
are .nearby, .move .the .ground .stake .in .the .
opposite .direction, .away .from .them . .
2 . . .Check .for .multiple .lines .by .moving .the .
Receiver .across .the .entire .area .between .
the .ground .stake .and .the .red .cable's .
clamp .connection .to .the .pipeline . .If .a .
second .or .third .line .is .detected .in .the .
"straddle .area," .move .the .ground .stake .to .
the .opposite .side .of .the .primary .line .to .be .
located .
3 . . .If .multiple .lines .are .present, .use .as .low .a .
frequency .as .possible, .such .as .8 .kHz .or .
.5 .kHz, .to .minimize .or .eliminate ."jumping" .
to .other .conductive .lines .
21