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Preface
The GA‐92XTd™ Magnetic Locator is a product of over sixty years' experience in producing the world's
finest flux‐gate magnetometers and magnetic detectors for aerospace, military and civilian
applications. The GA‐92XTd™ incorporates the knowledge obtained from manufacturing under the
most rigid quality control standards. The heart of the GA‐92XTd™ is its patented Schonstedt HeliFlux™
magnetic field sensors. These sensors, acknowledged to be the world's finest, make possible the
unequalled performance of the locator.
February 2017
Instruction Manual
Model
GA‐92
Magnetic
Schonstedt
Instrument
100
Edmond
Road,
(304)
725‐1050,
XTd
™
Locator
Manufactured
By
Company
Kearneysville,
Fax
(304)
725‐1095
E‐mail:
info@schonstedt.com
Made
in
USA
WV
25430
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Table of Contents
Summary of Contents for Schonstedt GA-92 XTd
- Page 1 Manufactured Schonstedt Instrument Company Edmond Road, Kearneysville, 25430 (304) 725‐1050, (304) 725‐1095 Web: www.schonstedt.com E‐mail: info@schonstedt.com ...
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Page 2: Table Of Contents
Important Notice Schonstedt believes the statements contained herein to be accurate and reliable; however, their accuracy, reliability, or completeness is not guaranteed. Schonstedt's only obligation shall be to repair or replace any instrument proven to be defective within seven years of purchase. Schonstedt shall not be responsible for any injury to persons or property, direct or consequential, arising from the use of any instrument.. 2 ... -
Page 3: Section I: Introduction
SECTION I: INTRODUCTION The GA‐92XTd™ magnetic locator detects the magnetic field of ferromagnetic objects. It responds to the difference in the magnetic field between two sensors that are spaced approximately 9.5 inches apart. This difference is referred to as the “signal strength” throughout this manual and is represented in the instrument by an audio tone, the display of a bar graph, and a numeric indication. In addition, the polarity of the signal strength is shown as a + or – sign on the display, and determines the side (right or left) on which the bar graph is displayed. Although most objects can be located using ... - Page 4 The GA‐92XTd™ unit can be operated either in the open or closed position and any position in between (see Figure 2). Figure 2: Open and Closed Positions NOTE: In the closed position using non‐lithium batteries, a slight signal may be detected in the high gain settings even if no ferrous material is present. This can be avoided by 1) decreasing the gain, 2) operating the unit in the extended position or 3) using a lithium battery. The GA‐92XTd™ has an internal detent mechanism to keep the unit in either the fully extended (open) or fully retracted (closed) position. To extend the unit, grasp the looped end of the locator and pull until the shaft locks into place. To return the unit to the closed position, push the looped end back into the shaft. The unit will lock into place. 4 ...
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Page 5: Section Ii: Operating Controls
SECTION II: OPERATING CONTROLS ON / Volume ( ): To turn the unit on, push this button. Upon turn on, the volume defaults to HIGH. Pushing the button a second time changes the volume to MEDIUM. Pushing the button a third time MUTES the volume. Additional pushes of this button cycle the volume through HIGH‐MEDIUM‐ MUTE. OFF: To turn the unit off, push this button. GAIN ( ): The sensitivity of the unit can be increased ... -
Page 6: Section Iii: Visual And Audible Indicators
SECTION III: VISUAL AND AUDIBLE INDICATORS Gain Level Indicator: The gain range is indicated by a 4‐ segment LCD as shown in Figure 4: L (Low), M (Medium), H (High) and XH (Extra High). Upon turn on, the gain defaults to M (Medium). Each press of the UP or DOWN arrow buttons will cause the gain level indicator to change accordingly. Figure 4: Gain Level Indicators Battery Level Indicator: The battery level is indicated by a 4‐segment LCD indicator, as shown in Figure ... -
Page 7: Section Iv: Connectors And Accessories
SECTION IV: CONNECTORS AND ACCESSORIES Headphone Jack: The headphone jack is located on the side of the unit near the face of the locator. Headphones are optional and may be purchased from Schonstedt as an accessory. The headphone jack is monaural. Standard stereo headphones may be used, but they will produce sound in only one ear. When the headphones are plugged in, the speaker sound will be muted, but the ON/Volume button still controls the volume of the headphones. ... -
Page 8: Section V: Battery Replacement
SECTION V: BATTERY REPLACEMENT The GA‐92XTd™ is powered by one 9‐volt lithium battery that has a shelf life of ten years, and it provides twice the operating life of an alkaline battery. The battery is located in the handle of the instrument and can be accessed by turning the screw counterclockwise. To remove the battery, tilt the unit so that the handle is pointing down, and the battery will slide out. When replacing the battery, ... -
Page 9: Section Vi: Operating Recommendations & Application Notes
SECTION VI: OPERATING RECOMMENDATIONS AND APPLICATION NOTES Search Procedure Turn the instrument ON. The gain defaults to Medium (M). Grasp the locator as illustrated in Figure 10. Because the upper sensor is located near the handle of the instrument (especially if it is being used in the collapsed position), wristwatches may produce unwanted changes in the audio signal and in the meter indication. Therefore, watches should be removed. Keep the locator away from your shoes as they may contain magnetic material. ... -
Page 10: Basic Signal Patterns
Basic Signal Patterns When the GA‐92XTd™ is positioned directly over a vertical target, the signal strength will peak (audio signal, digital readout, and bar graph) at either a positive or negative polarity. The audio signal, digital readout, and bar graph indications also peak over each end of a horizontal target. One end is positive, the other is negative. This will help you to distinguish between two vertical pipes or one horizontal pipe. Usually two vertical pipes buried in close proximity will produce bar graph indications with the same polarity. ... -
Page 11: Strongly Magnetized Markers
disappears when the locator is held higher or when the gain is decreased is likely coming from a smaller target. The signal from a rusty bolt or other small item (see Figure 14) is much weaker than the signal from a larger target, such as an 18‐inch length of 3/4 inch rebar which can be located at depths up to 7 feet. Figure 14: Decreasing gain Eliminates Unwanted Signals Strongly Magnetized Markers A strongly magnetized marker that is at or near the surface will provide a weaker indication on both sides of the marker, and that could be mistaken for the marker. The heavy line in Figure 15 represents the increase and decrease in the audio and bar graph indications ... -
Page 12: Correct Stake Orientation
Correct Stake Orientation When placing stakes, correct orientation is important. For checking purposes, the orientation of the pin relative to the locator is shown in Figure 16. Check the pin with one orientation. Then rotate the pin 180°. The orientation that gives the largest reading is the one that should be used. This reading should be positive ... -
Page 13: Locating And Tracing Barbed Wire
The GA‐92XTd™ can also be used to precisely locate the metal handles or reinforcing bars on septic tank covers at depths of up to 4 feet. Figure 19: Signal Patterns Provided by Septic Tank Covers Locating and Tracing Barbed Wire You can often trace barbed wire (from old fence lines) buried just beneath the surface. Even if the wire is only a trail of rust, it can still be detected near the surface. Tip the locator a little lower than usual ‐ but not parallel with the ground. Figure 20: Tracing Barbed Wire Examine trees for bench marks and bits of embedded barbed wire. Hold the locator parallel with the direction of the wire. Figure 21: Tracing Pieces of Barbed Wire Embedded in Trees 13 ... -
Page 14: Searching Areas Along A Chain Link Fence
Searching Areas along a Chain Link Fence Searching in the vicinity of a chain link fence requires a reduced sensitivity setting and some control over the orientation of the locator. As illustrated in Figure 22, position the locator horizontally with its long axis perpendicular to the fence. This insures that the upper sensor is kept away from the fence. ... -
Page 15: Locating Cast-Iron Pipes
Locating Cast‐Iron Pipes As illustrated in Figure 25, cast‐iron pipes produce the strongest magnetic signals at their joints. Figure 25: Signal Patterns Provided by Cast‐Iron Pipes After an initial sweep search identifies the general direction of the pipe, the steel pipe joints or transition points can be more accurately traced by the following procedure: 1. Set the Sensitivity control to maximum (XH indication). 2. Hold the locator vertically approximately 1 to 1‐1/2 feet above the surface. 3. Walk without turning or tilting the locator. 4. Mark the locations where the maximum signal levels occur. 5. Return to an area of maximum signal strength and hold the locator several inches above ... -
Page 16: Locating Ordnance And Weapons
Locating Ordnance and Weapons The versatile, lightweight, cost‐effective GA‐92XTd™ is also designed to aid EOD technicians and law enforcement officers during area search operations. Figure 27: Basic Signal Patterns from Vertical and Horizontal Targets Help to Determine Target Orientation. Figure 28: A 175mm Projectile can be Located up to 4 feet deep. Figure 29: An 81mm Mortar can be Located up to 12 inches deep. ... -
Page 17: Other Notes
Other Notes 1. A burbling sound indicates the presence of an energized power line. This will not influence the meter indication unless it is associated with a magnetic structure. 2. The instrument will not respond to non‐ferrous metals, such as gold, silver, copper, brass and aluminum. 17 ... -
Page 18: Section Vii: Specifications
Water and Dust Resistance Rated IP54, when operated with earphone jack plug (provided) Overall Length Open: 26” (66 cm), Closed: 15.5” (39 cm) Nominal Sensor Spacing 9.5” (24 cm) Weight 2.4 lb. (1.1 Kg) Construction Material High impact ABS SECTION VIII: TECHNICAL SUPPORT Schonstedt offers technical support and sales support. For any reason regarding usage and application please contact our technical support team at 888‐367‐7014. 18 ... -
Page 19: Section Ix: Warranty/Service Information
Schonstedt, a cost estimate will be submitted and no work will be completed until authorized by the customer. Batteries are specifically excluded under the warranty and should be addressed to the manufacturer of batteries in question. Schonstedt shall not be liable for any injury to persons or property or for any other special or consequential damages sustained or expenses incurred by reason of the use of any Schonstedt product. ... -
Page 20: Section X: Parts Diagram
SECTION X: PARTS DIAGRAM 20 ...
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