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Schonstedt Instrument GA-92 XT, Instruction Manual, Page: 1 / 19

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Instruction Manual 

 
 
 

Model GA-92 XT 

Magnetic Locator

 

 
 
 
 
 
 

Manufactured By 

Schonstedt Instrument Company 

100 Edmond Road 

Kearneysville, WV  25430 

(304) 725-1050 

Fax (304) 725-1095 

 

Made in USA

 

 
 
 
 
 
Preface 
 
The Model GA-92XT

 Magnetic Locator is a product of over fifty years experience in producing the 

world’s finest flux-gate magnetometers and magnetic detectors for aerospace, military and civilian 
applications.  The GA-92XT

 incorporates the knowledge obtained from manufacturing under the most 

rigid quality control standards.  The heart of the GA-92XT

 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. 
 
July 2013 

Summary of Contents for GA-92 XT

Page 1: ...s experience in producing the world s finest flux gate magnetometers and magnetic detectors for aerospace military and civilian applications The GA 92XT incorporates the knowledge obtained from manufacturing under the most rigid quality control standards The heart of the GA 92XT is its patented Schonstedt HeliFlux magnetic field sensors These sensors acknowledged to be the world s finest make poss...

Page 2: ... Locating Steel Drums 13 Locating Ordnance and Weapons 13 Other Notes 15 MAINTENANCE Replacement of Battery 15 Troubleshooting Guide 16 SERVICE INFORMATION 17 SPECIFICATIONS 17 WARRANTY SHIPPING INFORMATION 18 SPARE PARTS EXPLODED VIEW 19 Important Notice Schonstedt believes the statements contained herein to be accurate and reliable But their accuracy reliability or completeness is not guaranteed...

Page 3: ...o and visual responses will provide additional information to help you pinpoint a target and determine its orientation Figure 1 illustrates an application of the locator in which it is used to detect an iron marker of the type used for property line identification As shown the magnetic field of the iron marker is stronger at sensor A than it is at sensor B The audio response of your locator is des...

Page 4: ... unit in the extended position or 3 Using a lithium battery Open position Closed position Figure 2 Open and Closed positions The GA 92XT has an internal detent mechanism to keep the unit in either the fully extended open or fully retracted closed positions To extend unit grasp looped end of locator and pull until shaft locks into place To return unit to the closed position push looped end back int...

Page 5: ...g black This could be temporary and all segments will change back to black as the temperature increases 100 to 75 75 to 50 50 to 25 25 or less Figure 4 Battery Voltage Status Indications Headphone Jack The headphone jack is located on the side of the unit near the face of the locator The unit does not come with headphones but they may be purchased from Schonstedt as an accessory For optimum perfor...

Page 6: ...Polarity Indications Help to Determine Target Orientation With the XTd only The audio signal and bar graph XTd Model only indications peak over each end of a horizontal pipe 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 sam...

Page 7: ...e audio response and observing the bar graph XTd model only readout For a given gain setting the number of bars will be greatest when the locator is directly over a vertical target and over the ends of a horizontal target The X pattern is ideal for pinpointing small objects A 1 1 4 inch PK nail buried up to 8 inches can be located so precisely with this technique that it can be uncovered using a 1...

Page 8: ...arker that could be mistaken for the marker The heavy line in Figure 10 represents the increase and decrease in the audio and bar graph XTd model only indications as you move the locator over a marker Between points A and B the signals increase slightly and then decrease Just beyond B the signals increase rapidly peaks directly over the marker and then decreases at point C From C to D the signals ...

Page 9: ...on One is the magnetization induced by the Earth s magnetic field The induced magnetization is always downward in the Northern Magnetic Hemisphere and produces a positive output no matter which end of the stake is driven into the ground The other type of field is the permanent magnetization which is fixed to the pin For maximum detection the stake should be driven into the ground such that the per...

Page 10: ...l 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 15 Tracing Barbed Wire ...

Page 11: ...tting and some control over the orientation of the locator Position the locator horizontally with its long axis perpendicular to the fence as illustrated in Figure 17 This insures that the upper sensor is kept away from the fence Figure 17 Searching in the Vicinity of a Chain Link Fence Perform the search by slowly moving the locator forward along the fence while also moving it to the right and to...

Page 12: ...e 18 Placement of Locator while Searching along a Chain Link Fence Locating Valve Boxes Both the valve and its casing when iron provide strong magnetic fields which make them easy to locate Plastic enclosures containing magnets are easily located at depths of 6 feet or more Figure 19 Locating Valve Boxes and Casings Locating Cast Iron Pipes As illustrated in Figure 20 cast iron pipes produce the s...

Page 13: ...d during this second pass Four inch pipes can be located at depths up to 9 feet Locating Steel Drums As shown in Figure 21 the GA 92XTd s signal pattern will vary depending on the vertical or horizontal orientation of the drum and also how deep it is buried A fifty five gallon drum can be located at depths up to 8 feet Figure 21 Signal patterns provided by steel drums Locating Ordinance and Weapon...

Page 14: ...o 4 feet deep An 81mm mortar can be located up to 12 inches deep MK81 Low drag bombs can be located up to 7 feet deep A hunting knife under water can be located in up to 14 inches of silt A discarded hand gun can be located up to 12 inches deep ...

Page 15: ...f the instrument and can be accessed by turning the screw counterclockwise by hand or with the use of a screwdriver or coin To remove the battery simply tilt the unit so that the handle is pointing down and the battery will slide out When replacing the battery look at the inside of the battery door for the proper battery orientation The positive terminal should be on the right on the inside of the...

Page 16: ...t corrosion Do not remove Clean contacts Return unit to factory Intermittent Batteries not making good contact Check for corrosion Clean contacts Uncontrollable screaming Weak batteries Replace Most battery manufactures warranties cover the cost of repair or replacement of any device damaged by their batteries Removing batteries that leak will void their warranty ...

Page 17: ...le frequency 10 Hz Visual Expanding bar graphs indicate polarity positive or negative and relative signal strength Battery Indicator 4 segment LCD Gain Continuous control with range indicated by a 4 segment LCD at each quarter turn L 0 1 4 M 1 4 1 2 H 1 2 3 4 XH 3 4 Full Volume Continuous control Input Power Supplied by one 9 V battery Lithium recommended but not required Battery Life 24 Hours int...

Page 18: ...y misuse or abnormal conditions of operation repairs will be billed at cost Prior to repair in this instance a cost estimate will be submitted Service or shipping information will be furnished upon notification of the difficulty encountered Model and serial numbers must be supplied by user Batteries are specifically excluded under the warranty Schonstedt shall not be liable for any injury to perso...

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