Page 1: ...INSTRUCTION MANUAL FOR MODEL GA 32 MAGNETIC LOCATOR SCHONSTEDT INSTRUMENT COMPANY ...
Page 2: ...HelrFlux Locator MODEL GA 32 SCHONSTEDT INSTRUMENT COMPANY 1775 WIEHLE AVENUE RESTON VIRGINIA 22090 Telephone 703 471 1050 ...
Page 3: ... patented Schonstedt HeliFlux magnetic field sensors These sensors acknowledged to be the world s finest make possible the unequalled performance of the locator TABLE OF CONTENTS OPERATION I ntroduction Turn On and Range Setting Search Low Range Extended Range APPLlCATION NOTES Basic Search Patterns Strongly Magnetized Markers Manholes Septic Tanks Wells Pipes Barbed Wire Water Snow Along Fences V...
Page 4: ...ocator in which it is used to detect an iron marker for a property corner In the illustration the magnetic field of the iron marker is stronger at sensor A than it is at sensor B As a result the tone signal in the headphone has a higher pitch than its normal idling frequency of approximately 65 pulses per second Magnetic field of an iron marker TURN ON AND RANGE SETTING Connect the headphones to t...
Page 5: ...er para graphs Control setting for normal range SEARCH Grasp the locator just below the large end as illustrated be low Because the upper sensor is located near where the locator is usually held wrist watches may produce unwanted tone frequency changes To avoid such problems either remove the wrist watch or use the other hand The earphones are magnetic so the locator should not be operated closer ...
Page 6: ...he range con trol knob counterclockwise from the reference dot The added range imposes some constraint on oper ating methods The locator tone will vary in frequency depending on the instrument s orientation in the earth s magnetic f ield Control setting for extended range When searching using extended range keep the locator in a fixed orientation preferably vertical and away from the headphones Av...
Page 7: ...the ends of a horizontal target Using the X pattern while holding the locator vertically allows precise location of small objects A P K nail marker can be located so it can be uncovered using a 1 2 star drill A trick that helps if you find more than one signal when you should find only one is to raise the locator a few inches Any signal that disappears is probably not the one you are looking for T...
Page 8: ...quency increases and then suddenly decreases at B From just beyond B the tone frequency in creases sharply becomes very high over the marker and decreases just before reaching C From C to D the pattern is the reverse of that from A to B lt is ovbious that the locator must enter the B C region Otherwise the marker might be assumed to be between A and B or C and D The phenomenon is explained by the ...
Page 9: ...ty down all the way and you can easily trace the edges of the cover The great length of a wellcasing providesa strong field at the surface that permits easy location The locator can be used to precisely locate the metal handles or reinforcing bars on septic tank covers lron water and gas lines near the surface can be traced in some cases Greater signals are obtained at the joints ends and bends in...
Page 10: ...locator in flooded areas just keep the elec tronic unit out of the water You can often trace barbed wire of old fence lines beneath the surface Even if the wire is only a trail of rust it can be detected near the surface Tip the locator a little lower than usual but not parallel with the ground Snow poses no problem just thrust the locator into the snow as deeply as necessary to locate the target ...
Page 11: ...tely perpendicular to the fence This orientation assures that the upper sensor is kept away from the fence Search by moving the locator along the fence keeping the end a constant distance from the fence When a point 1 5l8 from the end of the locator is directly over the stake the signal will drop abruptly as shown below Any variation in position will produce an abrupt rise in the frequency of the ...
Page 12: ...ion under power lines may introduce a garbling of the tone signal The garbling generally does not significantly affect the detection capabilities of the instrument The GA 32 is ideal for locating water meters and utility shut off valves The locator is useful in many instances for detecting the presence of reinforcing bars in concrete The instrument will not detect nonmagnetic materials such as gol...
Page 13: ...ed in the exploded view of the electronic assembly below Access to the batteries is obtained by removing the nut at the end of the electronic unit followed by the case The battery keeper is removed by sliding towards the end The four batteries are connected in series The proper polarities for the batteries are shown on the clip assemblies Occasionally opposite contacts must be pressed toward each ...
Page 14: ...y replacement one half of a stereo set will work lnspect visually try increasing pressure of terminals by hand With electronics cover removed and headset plugged in unit will operate if you press contacts closed by hand Tone will sound noisy or will change abrupt ly when range control is adjusted Replace with correct monaural set Bend battery holder so batteries will f it tight lf corroded clean t...
Page 15: ...O LOCK CASE CLOSE CASE AND TURN WING NUTS CLOCKWISE UNTIL YOU HEAR LOCK SNAP INTO POSI TION SHIPPING IF CASE IS TO BE USED AS SHIPPING CONTAINER CLEAN AREA WHERE SHIPPING LABEL IS TO BE ATTACHED WITH ISOPROPYL RUBBING ALCO HOL oFl WEAR ACBOSS THE CHEST LIKE THIS oFl SHORTEN STRAP BY FORIUilNG A SECOND IOOP AT EACH END ANtrI WEAR ACROSS THE SHOULDER LIKE THIS TO OPEN CASE ...
Page 16: ... on when the headphone jack is plugged in Weight Approximately 3 pounds including head phones OperatingTemperaturet 0 F to 12O F Length 42 inches Waterproof Length 34 inches Nominal Sensor Spacing 20 inches Construction Rugged all solid state PATENTS Manufacture licensed under the following Patents United States 2 916 696 2 981 885 3 894 2a3 3 909 704 3 961 245 and 3B77 O72 Canada 637 963 673 375 ...
Page 17: ...ded under this warranty This warranty is effective for one year after delivery to the orig inal purchaser As a condition of the warranty the instrument must be returned by the original purchaser transportation charges prepaid and prove to our satisfaction to be defective lf fault has been caused by misuse or abnormal conditions of operation repairs will be billed at cost Prior to repair in this in...
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