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.
Table of Contents OPERATION Introduction ......................................................................................................1 Turn-on, Volume and Sensitivity Settings ...................................................... 3 Battery Level Indication ................................................................................. 4 Headphone Jack .............................................................................................. 4 Search Procedure................................
GASKET, FELT SCREW, #8-32 SQUARE O-RING PULL TIP SLIDER TUBE HOUSING PLUNGER SCREW, #6-32 X 3/4 DISPLAY HOUSING, LEFT SIDE LABEL, CO / PRODUCT BATTERY, 9V LITHIUM BATTERY DOOR ASSY ROLL PIN, 3/32 SCREW, #6-32 X 1/2 SCREW, #8-32 X 1/2 G11316 S51112 R40010 XT12300 XT12100 XT12200 S51113 XT11200 XT23000 B11014 XT13101 P23500 S51006 S51008 14 15 XT30000 XT40000 XT50000 L55002-2 L55002-1 N51111 WI6P XT1110 XT11610 PC11800 XT11605 K11105 XT20000 XT21000 N45000 XT11500-1 1 2 3 4 5 6 7 8 9 10 11 12 13 HOLSTER HEA
The GA-92XT¤ unit can be operated either in the open or closed position and any posistion 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 matterial 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. Open position Closed position Figure 2.
SPECIFICATIONS Turn-On, Volume and Sensitivity Settings (Specifications subject to change without notice) Output Audio: Signal increases in frequency with gradient field intensity. Idle frequency = 10 Hz.
temperatures may result in only two or three segments being 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% SERVICE INFORMATION If your locator needs service, please return it to the factory along with the following information: Name, Address, Telephone, Fax number, Where Purchased, Date, and Description of Trouble(s). An estimate will be provided prior to service work being done. See shipping information on page 18.
Troubleshooting Guide Symptom No response Possible Cause How to Check How to Fix Dead battery Replace - Battery not making contact Check for contact corrosion Clean contacts Battery leakage Do not remove battery* Return unit to factory Intermittent Battery not making good contact Check for corrosion Clean contacts Uncontrollable screaming Weak battery Replace - *Most battery manufactures' warranties cover the cost of repair or replacement of any device damaged by their batteries.
APPLICATION NOTES MAINTENANCE Basic Signal Patterns Audio signal peaks directly over vertical target. Visual indications also peak as either polarity. Audio signal peaks over each end of a horizontal target. Visual indications peak positive over one end and negative over the other end. The GA-92XT¤ is designed and built to give trouble-free operation. Normally, maintenance is limited to the occasional replacement of the batteries.
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. An 81mm mortar can be located up to 12 inches deep. AUDIO SIGNAL HIGHER ABOVE GROUND + OR AUDIO SIGNAL CLOSE TO GROUND + OR - MK81 Low drag bombs can be located up to 7 feet deep. CORNER MARKER SMALL BOLT Figure 9. Decreasing gain Eliminates Unwanted Signals A hunting knife under water can be located in up to 14 inches of silt.
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 bargraph (XTd model only) indications are produced at these points.
easily trace the edges of covers near the surface. Locating depth ranges up to 8 feet. The great length of a well casing provides a strong field at the surface that makes it easy to locate casings buried up to 15 feet deep. Locating Cast-Iron Pipes As illustrated in Figure 20, cast-iron pipes produce the strongest magnetic signals at their joints. + or - + or - 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.
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. Examine trees for bench marks and bits of embedded barbed wire. Hold the locator parallel with the direction of the wire. + Figure 16. Tracing Barbed Wire from Old Fence Lines SIGNAL NULL WITH LOCATOR AS SHOWN 1- 1/ 2 Figure 18.
