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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
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
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Summary of Contents for Schonstedt Instrument GA-92 XT
- Page 1 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...
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Page 2: Table Of Contents
TABLE OF CONTENTS OPERATION Page Introduction Turn-on, Volume and Sensitivity Settings Battery Level Indication Headphone Jack Search Procedure APPLICATION NOTES Basic Signal Patterns Strongly Magnetized Markers Correct Stake Orientation Locating Manholes, Septic Tanks and Well Casings Locating Objects under Snow or Water and Traced Barbed Wire Searching Areas along a Chain Link Fence Locating Valve Boxes Locating Cast-Iron Pipes... -
Page 3: Introduction
OPERATION Introduction The Model GA-92XT® family of magnetic locators detect the magnetic field of ferromagnetic objects. They respond to the difference in the magnetic field between two sensors that are spaced approximately 9.5 inches apart. The GA-92XT® family has two members, the indicator unit (GA-92XTi®) and the display unit (GA-92XTd®). -
Page 4: Turn-On, Volume And Sensitivity Settings
The GA-92XT unit can be operated either in the open or closed position and any position in between (see figure 2). 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 of the unit, 2) Operating the unit in the extended position or 3) Using a lithium battery. -
Page 5: Battery Level Indication
On-Off and Volume Knob: To turn the unit ON pull the on/off button up. To turn OFF, push it down. The volume of the unit can be increased by turning the knob clockwise. Gain Knob: The sensitivity of the unit can be increased (to detect smaller objects at greater depths) by adjusting the gain. - Page 6 When the GA-92XT is positioned directly over a vertical pipe, the audio indication will peak, and the expanding bar graph will peak at either a positive or negative level (XTd model only). Figure 6. The Meter's 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.
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Page 7: Application Notes
APPLICATION NOTES Basic Signal Patterns Audio signal peaks Audio signal peaks over each end directly over vertical of a horizontal target. Visual indica- target. Visual indications tions peak positive over one end also peak as either and negative over the other end. polarity. -
Page 8: Strongly Magnetized Markers
coming from a shallow target. The signal from a rusty bolt or other small item (see Figure 9.) is much weaker than the signal from a larger target such as a 18-inch length of 3/4 rebar which can be located at depths up to 7 feet. -
Page 9: Correct Stake Orientation
The two weaker indications occur because the locator is extremely sensitive to the magnetic field components parallel to its long axis. At point B and C the field is perpendicular to the locator so no peak audio or bar graph (XTd model only) indications are produced at these points. 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... -
Page 10: Locating Objects Under Snow Or Water And Traced Barbed Wire
The GA-92XT can be used to precisely locate the metal handles or reinforcing bars on septic tank covers at depths up to 4 feet. Figure 14. 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. -
Page 11: Searching Areas Along A Chain Link Fence
Figure 16. Tracing Barbed Wire from Old Fence Lines Examine trees for bench marks and bits of embedded barbed wire. Hold the locator parallel with the direction of the wire. 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. -
Page 12: Locating Valve Boxes
for an abrupt drop in the signal (as shown by the null in Figure 18) that will occur when the lower sensor, located 1-1/2 inches from the end of the locator, is directly over the stake. Any variation in the position of the locator will produce an abrupt rise in the frequency of the signal. -
Page 13: Locating Steel Drums
The initial search should be performed as follows: Set the Sensitivity control for maximum (XH indication). Hold the locator vertically approximately 1 to 1-1/2 feet above the surface. Walk along without turning or tilting the locator. Mark the locations where the maximum signal levels occur. Return to an area of maximum signal strength and hold the locator several inches above the surface. - Page 14 A 175mm projectile can be located up to 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.
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Page 15: Other Notes
Other Notes A burbling sound indicates the presence of an energized power line. This will not influence the meter indication unless associated with a magnetic structure. The instrument will not respond to nonmetallic materials such as gold, silver, copper, brass and aluminum. -
Page 16: Troubleshooting Guide
Troubleshooting Guide Symptoms Possible Cause How to Check How to Fix Dead Dead Batteries Replace -------- Batteries not making Check for contact Clean contacts contact corrosion Battery leakage Do not remove* Return unit to factory Intermittent Batteries not making Check for corrosion Clean contacts good contact Uncontrollable... -
Page 17: Service Information
Address, Telephone, Fax number, Where Purchased, Date, and Description of Trouble(s). An estimate will be provided prior to service work being done. FOR SERVICE OR REPAIR Please ship locator (in its case) to: Schonstedt Instrument Company 100 Edmond Road Kearneysville, WV 25430 SPECIFICATIONS... -
Page 18: Warranty/Shipping Information
LIMITED WARRANTY The Schonstedt Instrument Company (Schonstedt) warrants each product of its manufacture to be free from defects in material and workmanship subject to the following terms and conditions. The warranty is effective for 7 years* (with the return of the Customer Registration Card) after the shipment by Schonstedt to the original purchaser. -
Page 19: Spare Parts & Exploded View
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