manualshive.com logo in svg

Schonstedt Instrument GA-52Cx, Instruction Manual, Page: 7 / 17

Share
Download
Schonstedt Instrument GA-52Cx Instruction Manual Download Page 7

- 7 - 

Locating Manholes, Septic Tanks and Well Casings 

 

The magnetic field is strongest at the edge of a shallow manhole cover.  You can easily trace the 

edges of covers near the surface.  The locating depth for manhole covers ranges up to 10 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 18 feet deep. 

 

 

 

 

Figure 8:  Locating Manhole Covers 

Figure 9:  Locating Water Well Casings 

 

The GA-52Cx can be used to precisely locate the metal handles or reinforcing bars on septic tank 

covers at depths of up to 4 feet. 

 

 

 

Figure 10:  Signal Pattern Provided by Septic Tank Covers 

 

Summary of Contents for GA-52Cx

Page 1: ...t of over 60 years experience in producing the world s finest flux gate magnetometers and magnetic detectors for aerospace military and civilian applications The GA 52Cx incorporates the knowledge obtained from manufacturing under the most rigid quality control standards The heart of the GA 52Cx is its patented Schonstedt HeliFlux magnetic field sensors These sensors acknowledged to be the world s...

Page 2: ...plications 12 Other Notes 12 SECTION III MAINTENANCE Replacement of Batteries 13 Troubleshooting Guide 14 SECTION IV SERVICE INFORMATION 15 SECTION V SPECIFICATIONS 15 SECTION VI PARTS DIAGRAM 16 SECTION VII LIMITED WARRANTY 17 Important Notice Schonstedt believes the statements contained herein to be accurate and reliable however their accuracy reliability or completeness is not guaranteed Schons...

Page 3: ...which it is used to detect an iron marker 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 This creates a signal strength that is larger than zero which would occur when the field strength is the same at both sensors The audio response of the GA 52Cx is designed so that the frequency of the audio tone increases as t...

Page 4: ... the tone from its idling frequency When using headphones the Volume Control has no impact on the output level of the audio signal Figure 2 Sensitivity Set for Normal Range position 2 Search Procedure Turn the instrument on set the sensitivity control to position 2 Normal Range and grasp the locator as illustrated in Figure 3 Because the upper sensor is located near where the locator is usually he...

Page 5: ... and forth in an X pattern while listening to the audio response The audio peak will occur when the locator is directly over a vertical target or it will occur over the ends of a horizontal target The X pattern as shown in Figure 5 is ideal for pinpointing small objects By using this technique a 1 1 4 inch PK nail buried up to 12 inches can be precisely located Figure 5 X Pattern Provides Precisio...

Page 6: ...ion information that is misleading The heavy line in Figure 7 represents the variations in tone frequencies when the locator is moved over the marker When moving the instrument from A to B the frequency of the tone increases and then decreases suddenly at B From just beyond B the frequency of the tone increases sharply becomes very high directly over the marker and decrease just before reaching C ...

Page 7: ...ers ranges up to 10 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 18 feet deep Figure 8 Locating Manhole Covers Figure 9 Locating Water Well Casings The GA 52Cx can be used to precisely locate the metal handles or reinforcing bars on septic tank covers at depths of up to 4 feet Figure 10 Signal Pattern Provided by Se...

Page 8: ...r Water 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 First examine trees for bench marks and bits of embedded barbed wire Then hold the locator parallel with the directi...

Page 9: ...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 the left As you move forward this technique will allow you to search an area several feet wide Listen for an abrupt drop in the signal as shown by the null in Figure 14 that will occur when the lower sensor located 1 5 8 inches from the end of the locator is direct...

Page 10: ... to locate Plastic enclosures containing magnets are easily located at depths of 10 feet or more Figure 15 Locating Valve Boxes and Casings Locating Cast Iron Pipes As illustrated in Figure 16 cast iron pipes produce the strongest magnetic signals at their joints Figure 16 Signal Patterns Provided by Cast Iron Pipes ...

Page 11: ...cations where the maximum signal levels occur 5 Return to an area of maximum signal strength and hold the locator several inches above the surface The sensitivity will probably have to be reduced during this second pass Four inch pipes can be located at depths of up to 10 feet Locating Steel Drums As shown in Figure 17 the GA 52Cx s signal pattern will vary depending on the vertical or horizontal ...

Page 12: ...ardous materials might be encountered use the GA 52Cx to search the area prior to drilling Other Schonstedt magnetometers are available that can be lowered down the hole for periodic checks as drilling progresses Other Notes 1 A burbling sound indicates the presence of an energized power line 2 The instrument will not detect non ferrous metals such as gold silver copper brass and aluminum ...

Page 13: ... recommended due to their exceptional performance Lithium battery manufacturers advertise a 10 year shelf life two to four times the operational life of an alkaline battery and they advertise being environmentally safe If battery leakage does occur lithium batteries do not cause as severe of damage to the unit as alkaline batteries would As illustrated in Figure 18 the batteries are carried in the...

Page 14: ...Dead Dead Batteries Batteries not making contact Battery leakage Replace Check for contact corrosion Remove Clean contacts Return unit to factory Intermittent Batteries not making good contact Check for corrosion Clean contacts Uncontrollable screaming Weak batteries Replace ...

Page 15: ...s case to Schonstedt Instrument Company 100 Edmond Road Kearneysville WV 25430 SECTION V SPECIFICATIONS Specifications subject to change without notice Input Power Supplied by two alkaline 9 V batteries Battery Life 40 hours Intermittent usage Output Approximately 40 Hz idle tone in speaker Tone frequency increases or decreases with gradient field intensity Weight Approximately 2 5 lbs 1 13 kg Ope...

Page 16: ... 16 SECTION VI PARTS DIAGRAM ...

Page 17: ...usion or units that have been damaged or compromised due to repair alteration or modification by anyone other than an authorized repair representative Prior to a repair being performed by 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 ba...

Reviews:

No comments