TW-82 ACCESSORIES
3-Inch
Coupling Clamp
– CCLAMP-3
Useful for in-service and
electrical power line tracing
when a metal-to-metal hookup is
not possible
5-Inch
Coupling Clamp
– CCLAMP-5
Useful for in-service and
electrical power line tracing
when a metal-to-metal hookup is
not possible
Hard Carry Case
– 1802050000
Shock absorbent protective hard
carrying case with contoured
foam insert custom made to
house the TW-82.
35” x 7” x 16”
TW-82
DIGITAL LINE TRACER
Fisher Sonde Signal
Transmitter 82kHz
– SONDE-82.175
Small transmitter used to trace
the path of non-metallic pipes
and locate blockage in lines.
Sonde is inserted into a pipe or
duct by means of a push rod and
located using a Fisher receiver.
• Rugged Design
• Long Battery Life
• Outstanding Distance & Depth
Locate up to 15’ deep
• Operating Frequency: 82.175 kHz
• Weight 6.4 oz
• Length 6”
• Diameter 2”
• Battery Life: 70 hrs
• Operating Temperature
-20 to +60 C (4° to 140°F)
• End Cap Thread 3/8”-16 x 3/4”
MTW82 Manual Revision # 5 081414
Operating Manual
Revision Level 1
CONTENTS
Introduction ....................................................................... 3
Transmitter
Receiver ......................................................................... 7-13
Power-On
Lateral Mode
Unit Of Measure
Display .................................................................... 11-13
Auto Power-Down
Specifications
Warranty ........................................................................... 15
Accessories ......................................................... Back page
.................................................................... 4-6
......................................................................7
........................................................... 8-10
........................................................ 11
..................................................... 13
................................................................. 14
Q U A L I T Y
Fisher detectors are renowned for their quality.
Each detector is handcrafted in the USA with pride.
P E R F O R M A N C E
The worldwide underground utility industry relies on Fisher.
Our instruments are durable, dependable and locate deeper.
R E P U T A T I O N
Fisher produced the first patented metal detector in 1931. For
over 80 years, the Fisher logo has been a mark of excellence.
2 - YEAR LIMITED WARRANTY
Proof of purchase is required to make a claim under this warranty.
NOTE TO CUSTOMERS OUTSIDE THE U.S.A.
This warranty may vary in other countries; check with your
distributor for details.
Warranty does not cover shipping costs.
S E R V I C E
Should you have any questions or problems, contact:
FISHER RESEARCH LABS, INC.
1465 Henry Brennan Dr., El Paso, Texas 79936
Tel 1-800-685-5050 Fax 915-225-0336
www.fisherlab.com email: info@fisherlab.com
According to FCC part 15.21, changes or modifications made to this device,
not expressly approved by the party responsible for compliance, could void
the user’s authority to operate this equipment.
This device complies with FCC Part 15 Subpart B Section 15.109 Class B.
Not to be used with conductive tracing cables longer than 6.5’ ( 1.98 m)
15
SPECIFICATIONS
INTRODUCTION
RECEIVER
Frequency .....................................82.175 kHz
Standard Mode ............................. Automatic response
Lateral Mode ................................Programmable
Left/Right Guidance .....................Audible and visual
Azimuth Indicator ........................ Visual
Over-Target Indicator ..................Visual and audible
Battery Status .............................. Visual
Signal Strength Indicator ............ Numeric display & audible
Signal Current Measurement .....Numeric display, automatic
Depth Measurement ....................Numeric display, automatic
Battery Type .................................Two D-cell batteries (included)
Battery Life .................................. From 80 to 130 hours, depending
................................................on the volume setting
Weight, with batteries ..................3.60 lbs
TRANSMITTER
Output Frequency ........................ 82.175 kHz
Output Power (nominal) ..............Normal Setting = 0.25 watt
High Setting = 1.0 watt
Conductive Tracing ...................... Normal Power: 2 to 8,000 ohms -6dB
Impedance Matching Range ...... High Power: 2 to 3,000 ohms -6dB
Inductive Tracing ......................... Normal Power: 15 Vm
Magnetic Strength ..................... High Power: 25 Vm
Battery Type .................................Four D-cell batteries (included)
Battery Life .................................. Typically
.....................................................with high quality alkalines
Weight, with batteries ..................4 lbs
................
.................
2
2
130 hours
ENVIRONMENTAL
Ingress Protection Rating ............IP65 (stands up to water jets)
Operating Temperature Range ....-4ºF to 140ºF (-20ºC to +60ºC)
Relative Humidity ........................0 to 95% noncondensing
Shipping Weight (packaged) ........17.5 lbs
Field Carry Weight, w/accessories
*Includes Carry Case, Batteries, Ground Rod and Conductive Tracing Cables
Fisher Research Laboratory does not warrant suitability to specific use. Fisher
Research Laboratory shall in no event be liable for any direct, incidental,
consequential or indirect damages.
14
.15.5 lbs*
The TW-82 Digital Line Tracer components include a
Transmitter, Receiver, ground-rod assembly, carrying case
(soft or optional hard case) and an operator’s manual.
The TW-82 is an active single-frequency line tracer that is
used to locate and trace buried utilities using any of the
following three tracing methods:
1. Conductive Method
(preferred). In this method, the
accompanying transmitter energizes the buried utility
by making a direct electrical connection to it with
conductive tracing cables. In most cases, this method sets
up the strongest magnetic field for the receiver to sense
above ground.
2. Inductive Method
. When a direct physical connection
to the utility is unavailable, the utility may be energized
indirectly by magnetically coupling an energizing
current from the accompanying transmitter. Some prior
knowledge of the utility’s location is required so that the
transmitter can be placed and oriented near it in the
most effective manner.
3. Coupling Clamp
. In some cases a utility may be
exposed, but does not provide a direct connection for
the conductive tracing cables. The accessory coupling
clamp can be clamped around the exposed utility to
magnetically couple an energizing current from the
accompanying transmitter into the utility.
Never make direct contact with electrical or
1
communication lines that are in service. To trace such
lines in service, perform an inductive trace, either with or
without the coupling clamp.
3
TW-82 TRANSMITTER
current
depth
TW-82 Transmitter
The Transmitter has two controls: & .
The Button has a dual function:
1. When the Transmitter is powered on, switches
the device between normal (1/4 watt) and high (1.0 watt)
output.
2. With the Transmitter powered off:
A. Press-and-hold to program the
Power-Down
Successive presses of will show a flashing
feature.
battery indicator, followed by a blank screen or the
illuminated battery indicator.
• An illuminated battery indicator means that
Auto Power-Down
is activated.
• A blank screen means that Auto Power-Down
is deactivated.
B. After you release , the transmitter
power will turn on.
With the Auto Power-Down feature activated, the
Transmitter will automatically turn off 60 minutes after
the last key-pad press by the user. This is a battery
saving feature. The Transmitter will warn of power-down
by switching ON and OFF as described on the top of the
following page.
Auto
TW-82 RECEIVER
6. Depth:
Depth reading is only accurate if the electromagnetic field is
perfectly round.
The electromagnetic field
must have enough energy
for the device to accurately
calculate the depth. The
weaker the signal strength,
the less reliable the depth
indicator. For this reason,
depth readings for inductively
located utilities will tend
to be less accurate than
conductively located ones.
The depth reading is a measure of the distance between the tip
of the Receiver blade and the center of the buried utility. When
the device is directly over a buried utility, as indicated by the
Over-Target indicator, depth will automatically be displayed
in feet and inches (meters if metric). In general, the accuracy
of any depth measurement will be influenced by factors such
as proper azimuth orientation of the device, field strength and
the roundness of the field. The only 100% reliable method for
determining the depth of any buried utility is to hand-excavate.
7. Overhead Power Line Interference: When the Receiver
encounters an interfering overhead field greater than the
field from an energized buried line, the Receiver will display
zeroes, “000”, for the Depth and Current measurements.
In this case, the field from the overhead power line is
interfering with the buried line you are trying to trace. You
may still be able to trace the buried line, but the accuracy of
your trace will be impaired by this interference.
AUTO POWER-DOWN, RECEIVER
When 90 minutes have passed without the operator pressing
the control button, the Receiver will automatically power down.
• Lower left of the display will indicate “OFF”.
• Lower right of the display will count down from 10 to 0.
• The Receiver will then turn off.
To stop Auto Power-Down, press the button once.
134
PITCH INCREASES
AS YOU APPROACH THE UTILITY
NO SOUND
DIRECTLY OVER UTILITY
CONSTANT
PITCH BEYOND 45°
CONSTANT
PITCH BEYOND 45°
45°
VOLUME DECREASES WITH DISTANCE FROM UTILITY
TW-82 RECEIVER
current
TW-82 TRANSMITTER
Left/right & over-target - Continued
Audio: When you move within a 45º angle of the center of the
electromagnetic field, the audio pitch will change; the pitch
increases as you approach the utility. Outside the 45º zone, the
pitch does not change.
When the Receiver is directly over the utility, it goes silent. The overtarget indicator, •, also appears when the Receiver is silent.
When you are standing to the right of the utility, you will hear a
constant tone, and to the left, a pulsating sound.
4. Azimuth: These rotational arrows indicate the utility’s path
relative to your position. Rotating the device near a buried utility
causes the arrows to point in the
direction of the utility’s path.
Low Battery Power-Down Warning
When the Transmitter batteries are near the end of their
useful life, the Transmitter will warn the operator before
shutting down.
Five minutes before shutting down, the Transmitter will
alternately stop and start transmitting at approximately onesecond intervals. The operator using the Receiver, even at a
distance from the Transmitter, will notice the signal turning
on and off before the power turns off completely.
Accessory Output
1. Flip up the black protective cover to expose the
Accessory Output Jack.
2. Connect the conductive tracing cable plug for conductive
tracing.
When the conductive tracing cable is connected, Signal
Current will be displayed. The Signal Current Bar Graph
shows the quality of the connection.
Vertical Bars will illuminate to indicate the current
as follows:
mA indication 1 2 4 8 15 25 50 100 200
Actual Range (mA)
0.5-1.4 1.5-2.9 3.0-5.9 6.0-12.9 13.0-18.9 20.0-39.9 40.0-74.9 74-149 150+
Automatic Load Impedance Matching adjusts output to
provide full rated power over a wide range of loads (e.g.
utility types and conditions). It is tolerant of both dry
(high resistance) and shunted (low resistance) ground
connections.
5. Current Measure:
mA (milliamperes) of current flowing on the conductor.
Use Current Measure as an aid
for distinguishing utilities in close
proximity. The Current Measure
will generally be the highest on the
utility you are connected directly
to, regardless of the utility’s depth.
12
The Transmitter has a built-in antenna for inductive
locating. When the Cable Jack is not connected, the inductive
antenna automatically engages and begins transmitting.
When locating inductively, the Signal Current Bar Graph
will not be displayed, as there is no conductive trace load to
be measured.
WARNING: Do not handle output leads unless power is off.
ELECTRIC SHOCK HAZARD: Servicing to be performed
by qualified personnel only.
NEVER connect conductive cables to an energized power
line.
5
TW-82 TRANSMITTER
TW-82 RECEIVER
INDUCTIVE LOCATING
Inductive locating is most effective with
the Transmitter straddling the utility as
illustrated, with the utility perpendicular to the
Transmitter’s batteries.
If the utility direction is unknown, place
Transmitter on the ground, power on,
and sweep the Receiver a complete
360º around the Transmitter, keeping
at least a 25-foot (8-meter) distance
between the Transmitter and Receiver.
If unsuccessful, move the Transmitter
to another location. When located, the
Receiver’s azimuth indicator will show the
direction of the utility.
In inductive mode, the Transmitter’s LCD
will not display Signal Current. When the
conductive tracing cables are plugged in, the
Signal Current display will illuminate.
CONDUCTIVE LOCATING
1. Turn Transmitter Off.
2. Connect the Conductive Tracing
Cables to the Transmitter.
3. Push the Ground Rod into the
earth at a 90º angle to the direction
of the utility.
4. Connect the red clamp to the nonenergized utility.
5. Connect the black clamp to the
Ground Rod.
Be sure not to place the wires over any other utility.
6. Turn Transmitter On.
7. Move at least 25 feet (8 meters) away from the
connection point.
8. Sweep the Receiver in a circle around the
connection point.
9. Using information provided on the display,
find the areas that need to be traced and analyze
the situation in more detail to find the buried utility.
METRIC / IMPERIAL UNIT OF MEASURE
To change the Receiver unit of measure, follow this procedure:
1. Start with the Receiver OFF.
2. Press and Hold the Button for 10 seconds.
The device will turn on; continue to hold Button the full 10
seconds.
3. Release the Button after 10 seconds.
DISPLAY
1. Signal Strength: Indicates your proximity to the center of
the electromagnetic field emitted by the utility.
999: maximum value
0: minimum value
You may find different
locations where the Signal
Strength value is high. Use
this reading as a relative
indicator as to where the
utility is located. Signal
Strength is strongly
influenced by the depth of the
utility.
2. Battery Strength: When battery life declines to less than 1
hour (estimated) of operation the battery indicator outline
will be illuminated with
no segments. When the
batteries reach the end of
their useful life, the screen
will go blank and the battery
icon will flash before the
Receiver shuts off. Expect
about 60 hours of battery
life from a set of two D-cell
alkaline batteries.
3. Left/Right & Over-Target: These indicators show your
position relative to the center of the electromagnetic field.
Move to Move to You are over
the left the right the target
6
11
TW-82 RECEIVER
2-Button Operation - Continued
TRACING OPERATION
While tracing a line using the Lateral Mode, the display will appear
as illustrated below.
The SIGNAL number indicates the strength of the field emitted by
the buried line.
The buried line is located at the spot when the maximum SIGNAL
number is indicated. If you move left or right of the spot where the
maximum SIGNAL is found, the value displayed will fall.
Walk across the location of the lateral line with the blade
perpendicular to the lateral line.
MODE PROGRAMMING
While in the Lateral Mode, press-and-hold LATERAL to set the upper
limit of the SIGNAL RANGE.
The upper limit of the SIGNAL RANGE appears at the bottom-left of
the display. The default value is 150.
Press LATERAL to change the number. Press-and-hold LATERAL to
exit programming mode. Changes to this upper limit of the SIGNAL
RANGE are saved to memory.
Changing this upper limit is similar to the gain adjustment on other
line tracers which use a peak mode of operation. Set the number
just above the highest SIGNAL number, as described on the previous
page.
TW-82 RECEIVER
TW-82 Receiver
2-BUTTON OPERATION
BUTTON
• Power-Up: Press Button to turn ON
• Volume Control: Tap the Button to adjust volume
1. Mute
2. Low
3. Medium
4. High
Continued presses of the button cycles
back to setting #1.
• Power-Down: Press-and-Hold Button to turn OFF
10
7
TW-82 RECEIVER
LATERAL LINE
LATERAL LINE
WALK P A R A L LEL TO M A I N LIN E
Blade is
perpendicular
to lateral line
TW-82 RECEIVER
2-Button Operation - Continued
BUTTON
• Press to enter Lateral-Tracing Mode.
• Press again to exit Lateral-Tracing Mode.
While in LATERAL Mode, press-and-hold to program:
• To exit Lateral programming, press-and-hold again.
• To set the upper limit of the signal range, press .
Each press of toggles through the program choices:
50, 100, 150, 200, 250 or 300
Set this upper limit just above the maximum SIGNAL
number that appears during your lateral trace.
The correct setting will make it easier to hear the peak in the
signal as you pass over the lateral line.
Set the number just above the highest SIGNAL number.
Examples:
If the highest lateral
SIGNAL number is: Set to:
137 150
159 200
310 300
(300 is the maximum possible)
At some sites, utility lines branching off from a main line may be
difficult to trace using the Normal Mode of operation. The signal
from the main line may be so strong that
it overwhelms the signal from the
lateral line. In this illustration,
gas service lines connecting
to homes from a main
gas line may carry far
less current than
the main line.
This weaker
current could
be the result
of a lateral
line that is
shorter than
the main
line, or a
lateral that
is not well
grounded.
Button - Continued
When conducting a trace of the Lateral line, select LATERAL Mode
and walk parallel to the main line (as in the illustration below). You
must use Lateral Mode in this situation because in the Regular Mode,
you may detect the signal from the main line all of the way up to the
house, even with the blade of the Receiver parallel to the main line.
Using the Lateral Mode, you can ignore the signal coming from the
parallel main line and detect signals coming from the perpendicular
lateral lines. The Lateral Mode will detect the main line in very close
proximity, even though the blade is parallel to it. So maintain a distance
of 6 to 12 feet from the main line when tracing lateral lines.
Walk parallel to the main line, holding the blade of the Receiver
perpendicular to the lateral lines.
8 9
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