CST/BERGER Magna-Trak 100 C19550 User manual

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INSTRUCTION MANUAL
Magna-Trak 100®
Magnetic Locator

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Thank you for purchasing the Magna-Trak 100®Magnetic Locator. Please read this manual thoroughly before
operation.
CONTENTS
1. Introduction ............................................................................................................................ 3
2. Theory of Operation................................................................................................................. 3
3. Features .................................................................................................................................. 4
4. Basic Operation and Description.............................................................................................5
4.1 Power ON/OFF Switches ........................................................................................................................ 5
4.2 Volume and Sensitivity Control Knobs...................................................................................................... 5
4.3 Speaker ................................................................................................................................................ 5
4.4 LCD Visual Display................................................................................................................................. 5
5. Battery Replacement............................................................................................................... 6
6. Field Operation........................................................................................................................ 7
6.1 Water Locations .................................................................................................................................... 8
6.2 Locating Near a Steel Fence................................................................................................................... 8
7. Signal Response...................................................................................................................... 9
7.1 Typical Signal Responses ..................................................................................................................... 10
8. Specifications .......................................................................................................................11
9. Warranty & Service ............................................................................................................... 11

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1. INTRODUCTION
The Magna-Trak 100®magnetic locator is a flux-gate type of magnetometer which incorporates a unique patented
technology that enables the factory to balance the magnetic sensing coils to a finite condition. This patented
method of magnetic balancing is advanced in the state of the technology.
The Magna-Trak 100 implements “peak response” over ferromagnetic objects by yielding an increasing audio
signal as the object is approached and passed over.
This instrument is the product of many years of experience and service provided by CST to the industry.
2. THEORY OF OPERATION
The Magna-Trak 100 locator finds ferromagnetic objects by sensing the magnetic field radiated by the object.
The locator contains two sensor coil assemblies that are precisely spaced and electronically balanced to achieve
a near magnetically-balanced operating condition. In a uniform magnetic field, such as the earth’s field, the two
sensor coils maintain a magnetically-balanced status, because both of the coils experience the same magnetic
lines of force. However, when a ferromagnetic object is approached, the field strength and angle of the magnetic
lines upon each sensor is different. This difference, although minute, is enough to offset the critical balance and
produce an audible indicating signal (Fig. 1).
When no ferromagnetic objects are present, the speaker emits a steady low frequency tone. As the object is
approached, the audio frequency increases until the center of the object is directly beneath the locator’s lower tip
sensor. The frequency peaks and then decreases as the object is passed. The peak indicates the exact location of
the object.
Nonferrous objects do not affect the locator. Objects made of brass, aluminum, copper, etc. are ignored.
Fig. 1
Sensor coils unbalanced by magnetic field of iron stake.

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3. FEATURES
• Rugged high-impact plastic enclosure with aluminum sensor pole
• Powerful magnetic speaker with waterproof Mylar cone
• Lightweight, comfortably balanced for easy handling
• Easy view LCD display for visual signal strength and battery information:
includes two digit numeric signal indicator, expanding analog Bar-Graph signal indicator,
and flashing “Low Battery” indicator
• Six “AA” (11⁄2volt) battery operation; Approximately 25 hours battery life
• Quick-access battery compartment
• Adjustable sensitivity and volume controls
• Single hand touch-switch operation for power ON/OFF
• Deep tone audio under search conditions; signals “peak” over magnetic objects
• Full depth capability
• Includes padded carrying case with shoulder strap or hard case

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4. BASIC OPERATION AND DESCRIPTION
4.1 Power On/Off Switches
Press “ON” once to activate the locator circuitry. Press “OFF” once to turn the battery power off.
4.2 Volume and Sensitivity Control Knobs
Rotate the volume knob to the desired audio volume level. Full volume is achieved when the knob is turned fully
clockwise.
The sensitivity or depth range can be varied using the sensitivity knob. Maximum range is provided at full
clockwise rotation. The optimal setting is determined by each particular application. Areas crowded with various
undesired ferrous objects may require a reduced sensitivity level. Deeply buried objects being searched will require
a higher sensitivity level.
A decal with markings for both the sensitivity and volume control knobs is provided as a reference for future
settings or comparisons.
4.3 Speaker
When no ferrous metal is present, the audio sound heard will be a low frequency tone. As ferrous metals are
approached, the audio tone will increase.
4.4 LCD Visual Display
Several visual display functions, provided for ease of operation, are defined below:
“Ferrous”
Defines the basic function of the locator as a ferrous locator (fixed indicator).
Digital Signal Indicator
A two digit numeric display shows the signal level as related to the audio signal response being heard from the
speaker. At the lowest signal level, when no ferrous metal is present, a small number will be viewed (between “0”
and “5”). As metal is approached, the numbers will increase, reaching “99” at its maximum peak. Deeply buried
objects or lower sensitivity levels will yield a lower peak number to aid in pinpointing the object.
Analog Bar-Graph Signal Indicator
The bar graph display expands outward from the center “diamond” as related to the audio signal response being
heard from the speaker.

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5. BATTERY REPLACEMENT
The LCD will display a flashing “Low Battery” warning when the batteries fall below a predetermined voltage level,
alerting you to replace the batteries soon. Several hours of battery life remain; however, in cold temperatures, this
time may be shorter.
Replace the batteries as follows:
1:
Turn the power off.
2:
Unscrew the thumb screw on the battery cover (2-5 turns) and lift the cover off until the tab at the rear of the
cover clears the slot it is located in.
3:
Remove the batteries by raising the batteries at the contact point of each pair. Dispose of used batteries properly.
4:
Insert new batteries, observing the polarity labels located inside the battery well.
NOTE: Do not mix old and new batteries. Replace all batteries at the same time with new batteries. Also, do
not replace the batteries under wet or rainy conditions, allowing water to enter the battery compartment.
5:
Reinstall the cover in the reverse manner, being careful not to overtighten the thumb screw.
In the event the “Low Battery” indicator is not displayed, no visual indications appear on the LCD window and no
sound is heard after pressing the power ON switch, the batteries may be dead; check the battery compartment
immediately. Dead batteries should be removed immediately as they are prone to leakage and can cause perma-
nent damage.
Always remove batteries before storing your locator.

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6. FIELD OPERATION
The recommended search position is a 45° angle from the earth’s surface. Scan the locator pole from side-to-side
in a slow sweeping motion while walking in a steady direction. Maintain a consistent height above the ground
during the side-to-side sweeping motion.
Once the object being searched is located, pinpointing the object’s location can be accomplished by holding the
locator vertically and sweeping it in an “X” pattern until the absolute signal peak is found (Fig. 2). The audio sound
and visual LCD display will provide the pinpointing results.
Please note that your magnetic locator is not only sensitive to buried ferrous objects, but also to items in your
possession. Ferrous objects such as steel tipped shoes, a pocket knife, some wrist watches, key chains or other
objects containing ferrous material can cause false signals during your search.
The locator is not affected by the presence of nonferrous objects, such as copper, aluminum pull tabs or foil, and
other forms of trash that may be present in the ground. Snow, ice, water, wood, plastic, concrete, stones, and the
ground itself have no effect on the performance of the locator.
Locator’s Electrical response
representation
Physical “X” Motion Shown
Fig. 2

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6.1 Water Locations
The pole section of the locator can be submerged into water, up to just under the plastic case (Fig. 3).
6.2 Locating Near a Steel Fence
Move or slide the locator across the ground while holding the length of the locator body perpendicular to the fence.
Do not roll the locator on the ground. Maintain a consistent distance between the tip of the locator and the fence.
The object will be directly below the tip of the locator (approx. 1⁄4" from the tip).
Fig. 3
Fig. 4
Buried iron stake
Consistent
distance
Slide locator
back and forth
Signal

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7. SIGNAL RESPONSE
Figure 5 shows audio and LCD visual signal response to:
1: no object,
2: one small deeper metal target, and
3: a second larger and shallower metal object.
The LCD display indicates both the numeric digital and analog bar-graph response as the locator passes over the
ground.
(1) (2) (3)
Fig. 5

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7.1 Typical Signal Responses
The metal handles on the
septic tank cover will provide
a usable signal to determine
the location of the actual cover
(Fig. 6).
Large metal objects may
cause double signals as
indicated (Fig. 7).
The center of the cover is
found by sweeping the locator
back and forth to create a ring
pattern response. The center
null will designate the cover’s
center.
The joints, elbows and ends
of iron pipes will create the
strongest signals (Fig. 8).
Hold the locator in a vertical
position while searching to produce the
best results.
Sewer Cover
Signal Response
Signal Response
Signal Response
Signal Response

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8. Specification
Power: Six “AA” (11⁄2volt) batteries
Battery LIfe: Approximately 25 hours of intermittent operation (alkaline batteries)
Output: Powerful magnetic speaker with waterproof Mylar cone
LCD Display: Numeric digital, analog Bar-graph and low battery indicator feature
Weight: Approximately 3 lbs. (1.3kg) with batteries
Operating Temperature: 0°F to 120°F (-18°C to 49°C)
Length: 40 inches (101.6 cm)
Construction: High-impact water resistant plastic, epoxy painted. Aluminum sensor tube waterproof to just under
the plastic case.
Patent: United States #4,439,732.
Nominal Sensor: 20 inches (50.8 cm)
Specifications subject to change without notice.
9. Warranty
Robert Bosch Tool Corporation, warrants the Magna-Trak 100 against defects in material and workmanship for a
period of five years from the date of purchase. Deficient products will be repaired or replaced at Bosch's discretion.
For warranty and repair information, contact you local distributor.
Before returning the instrument to Bosch, please call [phone] for a Return Authorization Number from our
Customer Service Department.
Bosch's liability under this warranty is limited to repair or replacement of the unit. Any attempt to repair the product
by other thanfactory authorized personnel will void this warranty. Calibration, batteries and maintenance are the
responsibility of the user. Where permitted by law, Bosch is not responsible for incidental or consequential damages.
Agents of Bosch cannot change this warranty. Bosch is not responsible for damage resulting from wear, abuse, or
alteration of this product. The user is expected to follow ALL operating instructions.
This warranty may provide you with additional rights that vary by state, province or nation. Magna-Trak 100 is a
registered trademark of Bosch.
IMPORTANT NOTE: The customer is responsible for the correct use and care of the instrument. Moreover he is
completely responsible for checking the job along its prosecution, and therefore for the calibration of the instrument.
Calibration and care are not covered by warranty.
Subject to change without notice

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03/14 Rev. 4 2610A04627
© Robert Bosch Tool Corporation, 1800 W. Central Road Mt. Prospect, IL 60056-2230
Exportado por: Robert Bosch Tool Corporation Mt. Prospect, IL 60056-2230, E.U.A.
Importado en México por: Robert Bosch, S.A. de C.V., Calle Robert Bosch No. 405, Zona Industrial,
Toluca, Edo. de México, C.P. 50070, Tel. [phone]
Robert Bosch GmbH
Power Tools Division, 70745 Leinfelden-Echterdingen, Germany
www.bosch-pt.com <http://www.bosch-pt.com>
www.cstberger.com
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