Fisher Labs TW-6 Manual de usuario

TW-6

Operating Manual

Pipe and Cable Locator

F I S H E R R E S E A R C H L A B O R A T O R Y

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CONTENTS

Introduction ...............................................................................pg. 3

Receiver .....................................................................................pg. 4

Transmitter..................................................................................pg. 5

Component Descriptions .........................................................pg. 6

Modes of Operation .................................................................pg. 7

The Inductive Mode..................................................................pg. 7

How to Assemble ......................................................................pg. 7

How to Tune...............................................................................pg. 8

Inductive Locating (with handle)............................................pg. 10

High Power (with handle).........................................................pg. 11

Inductive Tracing (without handle) ........................................pg. 12

Inductive Locating When Only Approximate Position of a

Linear Conductor is Known......................................................pg. 13

Pinpointing Centering of the Pipeline.....................................pg. 13

Determining Conductor Depth by Triangulation ..................pg. 14

Locating Manhole Covers, Valves, Tees and Risers..............pg. 15

Locating Pipe When Other Lines are Close by......................pg. 15

Conductive Tracing (without handle)....................................pg. 16

Tracing Procedure ....................................................................pg. 18

The Tracer Probe .......................................................................pg. 18

The Coupling Clamp ................................................................pg. 19

Locating Non-Metallic Pipes....................................................pg. 20

Operating Hints .........................................................................pg. 21

Changing Batteries ...................................................................pg. 22

Specifications ............................................................................pg. 23

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INTRODUCTION

to set the standard of quality in the design and manufacture of

even greater speed and precision in locating underground pipes

and cables.

covers, manhole covers, or valves clearly visible at the surface of

the ground are excellent items to start locating. This way you will

WARNING: Batteries can contain hazardous materials and must

be disposed according to the laws in your country.

This Category II radiocommunication device complies with

Industry Canada Standard RSS-310.

Ce dispositif de radiocommunication de catégorie II respecte

la norme CNR-310 d’Industrie Canada.

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RECEIVER

1. Carrying Strap: Keeps one hand free for marking

ground or pavement while using Tracer Probe.

2. Meter: Indicates signal strength up to a point

from metallic conductors while locating or tracing.

Meter also gives a visual indication of battery

strength.

3. Accessory Input: Use this jack to plug in all

accessories except the headphones.

4. Sensitivity:

A. Toggle switch to select NORMAL or HIGH

range.

B. Knob to control sensitivity level within the

NORMAL or HIGH range.

5. Depth Level: This bubble indicates the angle of

the receiver to the ground. Use it to keep Receiver

and Transmitter level during Inductive Locating

and for making the 45-degree angle necessary in

depth determination.

6. Headphones: Use this jack to plug in

headphones only. It automatically silences

speaker. Use in particularly noisy areas.

7. Battery Test: Turn unit ON then press this red

button and observe battery strength on meter. If

meter reads below 80, replace receiver batteries.

Usually transmitter & receiver batteries are

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replaced at the same time.

8. Power: Pull out for ON, push in for OFF.

9. Speaker: Produces the audible signal, which

increases in volume and pitch as signal strength

increases. The volume and pitch increase even

after the meter has peaked at 100.

RECEIVER

TRANSMITTER

1. Battery Test Meter: Gives a visual indication of

battery strength. Battery test is activated

automatically when unit is turned ON.

2. Constant Signal/Warble Tone Switch:

A. When toggle switch is in left position a constant

signal is generated/transmitted.

B. When Toggle Switch is in right position, the TW6

generates a warble tone. This results in a pulsating

sound and an oscillation of the needle between

zero and 100.

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3. Accessory Output: The Ground Plate Assemblies

Coupling

Clamp or Ground Rod Assembly connects into

this jack for a Conductive Trace or Direct Induced

Trace.

TRANSMITER

COMPONENT DESCRIPTIONS

1. Ground Rod/Harness Assembly: Provides a

“ground” for greatest efficiency in CONDUCTIVE

TRACING. For hard ground, the accessory Ground-

Rod /Harness Assembly is recommended.

2. 3-Piece handle: For use in INDUCTIVE LOCATING.

3. Handle Carrying Strap: Allows you to lower handle

closer to the ground for greater depth penetration

and sensitivity in locating. The same strap is used for

carrying the receiver.

4. Handle Carrying Case: Protects 3 piece handle

and makes a neater bundle.

5. Carrying Case: Sturdy protection for your TW-

6 and storage for accessories, such as coupling

clamp, headphones, mini probe, and ground plate

assembly.

6. Headphones: Stereotype headphones are

available for the TW-6. They are switch selectable

from monaural to stereo and may not work with the

TW-6 when switched to mono. You may prefer to use

the stereo phones because volume is adjustable

separately to each ear. The VCO sound is shrill and

without a volume control on the mono headphones,

the sound may be uncomfortable.

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MODES OF OPERATION

and CONDUCTIVE. In the INDUCTIVE mode, the Transmitter

LOCATING and (2) Transmitter placed on the ground directly

above and in line with the conductor for TRACING and the path

of the conductor.

The CONDUCTIVE mode operates when you connect the

Transmitter directly to an exposed portion of the pipe or cable in

question with the Ground Plate Assembly, or with the Coupling

Clamp, or the Ground Rod Assembly.

THE INDUCTIVE MODE

HOW TO ASSEMBLE

end sections into the central section and turn the

2. Place the Transmitter on its back and insert

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HOW TO TUNE

1. Check batteries on both Transmitter and

Receiver.

2. Place the Receiver Sensitivity Switch in the

NORMAL position.

3. Turn SENSITIVITY knob to 7.

4. To turn ON, pull POWER switches on Receiver and

Transmitter.

5. Pick the unit up by the handle and balance it so

that it is level with the ground and at normal carrying

height (arms length). For a deeper search, hold with

the carrying strap which has been fully lengthened.

You will need to hold the instrument at this lower level

while tuning if you plan to use it lowered. On some

may not be able to use it with strap fully lengthened.

reaching a null can also indicate the presence of

nearby metal.

CAUTION: Never attempt to tune the TW-6 in the presence of metal

objects like cars, metal walls, roofs or heavy metal reinforcements

in any structure. Their presence will make proper balancing

impossible.

lowest meter and speaker indications are reached.

in either direction results in an increase in sound and

meter reading. If at the lowest point there is still sound

MODES OF OPERATION

4. With the Transmitter still on its back, align the two

holes in the panel of the Receiver with the knobs.

5. Turn the lower knob of the two knobs until it is

spring is compressed and the panel is pulled within

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and meter reading, turn down sensitivity slowly until

without an increase in sound and meter reading,

turn the sensitivity knob up from 7 to 8 and try again,

going through the null area making sure it does not

balance.

CAUTION: Keep away from cars, fences and metal

objects during this procedure.

You are now ready to locate. Crossing over buried

metal causes an increase in sound and meter

reading.

MODES OF OPERATION

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INDUCTIVE LOCATING (with handle)

locate lost or unknown metal pipes and cables. Walk at a right

angle toward what you assume to be the conductor’s position. As

you near the conductor, the speaker sound and meter indication

will increase. They will reach maximum readings when you are

earlier models, the sound volume and pitch increases far higher

than when the meter peaks. This will allow you to do most of your

locating without several readjustments of the Sensitivity knob.

As you cross over, the indications will begin to decrease because

a mark at your feet when readings reach their maximum. Cross

over the pipe, turn around and come back. Make a second mark

when readings return to maximum. Measure between the two

marks and bisect the distance. That is where the conductor is.

three locations you should be able to draw a straight line (unless

pipe has turned). Careful additional locations may be necessary

if no prints of the area are available.

It may be necessary to reduce sensitivity with the knob when the

peaked and sound is at a high level, you will want to bring the

sensitivity down to see the peak of the needle at a point less than

your peak reading.

MODES OF OPERATION

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