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DEVELOPMENT, MANUFACTURING AND SUPPLY OF INSTRUMENTATION
12.1.3.Choose.the.load.type.from.the.options:
- “clips”
.(connect.“output.cable”.to.the.connector.“OUTPUT”.on.the.back.panel);
- internal transmitting inductor “In”
.(no.connections.allowed.to.the.“OUTPUT”.connector.on.
the.back.panel);
12.1.4.Connect.the.output.of.the.device.to.the.utility.under.examination.via.contact..or..non-
contact..(induction)..method..(in..accordance...with..the..chosen.utility.locating..method)....The..
contact..method..is..more..efficient..for.utility.location..but..not..always..convenient.and.absolutely.
unsuitable.for.the.location.of.cables.which.are.“under.voltage”.
NOTE:
In.the.article,.only.classical.methods.of.“contact”.and.“non-contact”.connection.are.represented.
in.various.circumstances..Special.connection..options..such.as.“conductor-conductor,.“conductor-
armour”,.“armour-earth”,.“parasitic.capacity.of.unconnected.multi-conductor.cable”.and.others.
used. under. the. specific. conditions. and. only. for. “flaw. detection”. are. considered. in. the. “utility.
locating.methods”.indicating.in.the.descriptions.of.the.utility.locators..
1) Base Method of the “Contact” Connection to the Utility
The.“clips”.are.used.(“output.cable”.with.“alligator”.clips).and.earth.rod..One..clip..should..be..
connected..to..the..input..of..the.utility.under..examination..and..the..second.one.to.the.earth.
rod.(or.to.the.relevant.earthing,.for.example,.standard.earthing.bus).at.maximum..distance.from.
the.utility..It.is.essential.to.provide.close.contact.with.utility.and.Earth..The.opposite.end.of.the.
utility.under.examination.should.be.earthed.for.creating.the..paths.for.earth.return.of.the.signal.
revocable.current..If.the.transmitter.is..connected.
directly.to.the.utility,..and.current.is.not.indicated..(.
you.see.“-.-“.on.the..screen),.make.sure.that.there.
is.current.in.the.utility.by.checking.it.with.receiver.
Special.option.–.bare.PIPE.IN.THE.GROUND..The..
ground..contact..is..possible..along..the..entire..length..
of..the.utility.and..in..any..segment..The..additional.
earthing.of.the.pipe.is.useless..
In. this. case,. . the. . resistance. . between. . the..
connection..to..the..pipe..and..earthing..point..(rod..
or..other.standard.earthing.bus).is.extremely.low..
“Revocable”..current..is..reduced..considerably..
the.farther.the.location.from.the.connection.point....
Nevertheless,..owing..to..the..unique..(for..this..type..
of..devices).“reserve”.of.the.output.current.(more.
than.5.A.at.the.load.less.than.0.8
Ω
),.it.offers.high.
probability.of.the.successful.utility.location.at.a.considerable.distance.from.the.connection.point.
The..diminishing..of..the..signal..at..the..distant..pipeline..sections..is..offset..by..the..considerable..
“reserve”.for.the.manual.or.automatic.adjustment.of.the.sensitivity.of.receivers.made.by.TECHNO-
AC..
NOTE
for.“non-contact”.connection.methods.(“In”./.“clamp”).
Summary of Contents for AG-309.15G
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