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Schonstedt Instrument GA-72Cd, Instruction Manual

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Schonstedt Instrument GA-72Cd Instruction Manual Download Page 10

- 10 - 

The

 

GA

‐

72Cd

 

can

 

be

 

used

 

to

 

precisely

 

locate

 

the

 

metal

 

handles

 

or

 

reinforcing

 

bars

 

on

 

septic

 

tank

 

covers

 

at

 

depths

 

up

 

to

 

4

 

feet.

 

 
 
 
 
 
 
 
 

 

 

+ or - 

AUDIO SIGNAL 

+ or - 

 
 
 
 
 
 

 

 
 

Figure

 

14:

  

Signal

 

Patterns

 

Provided

 

by

 

Septic

 

Tank

 

Covers

 

 
 

Locating

 

Objects

 

under

 

Snow

 

or

 

Water

 

and

 

Tracing

 

Barbed

 

Wire

 

 

The

 

locator

 

can

 

be

 

used

 

in

 

snow

 

or

 

in

 

flooded

 

areas

 ‐ 

just

 

keep

 

the

 

electronic

 

unit

 

out

 

of

 

the

 

snow

 

or

 

water.

 

 

 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Figure

 

15:

  

Locating

 

Objects

 

under

 

Snow

 

or

 

Water

 

 

Summary of Contents for GA-72Cd

Page 1: ...duct 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 72Cd incorporates the knowledge obtained from manufacturing under the most rigid quality control standards The heart of the GA 72Cd is its patented Schonstedt HeliFlux magnetic field sensors These sensors acknowledged to be the worl...

Page 2: ...g Ordnance and Weapons 13 Additional Applications 15 Other Notes 15 SECTION III Data Logger Output 16 SECTION IV Maintenance Replacement of Batteries 17 Troubleshooting Guide 18 SECTION V Service and Shipping Information 18 SECTION VI Specifications 19 SECTION VII Warranty Information 20 SECTION VIII Repair Parts 21 Important Notice Schonstedt believes the statements contained herein to be accurat...

Page 3: ...e locator 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 As a result the frequency of the audio signal is higher than the idling frequency 40 Hz which exists when the field strength is the same at both sensors This stronger signal also causes the digital indication to peak in eithe...

Page 4: ...d Sensitivity Battery Charge Level Indicator Indicator Negative Polarity Positive Polarity Expanding Bar Graph Expanding Bar Graph Figure 2 Control and Meter Indications Battery Level Indication The meter s BATT indication displays the batteries voltage level When all four segments are black the voltage level is between 100 and 25 up to 40 hours of operation with intermittent usage As the voltage ...

Page 5: ...72Cd down without turning the Sensitivity Power switch to Off the power on monitoring feature designed to conserve battery life will initiate a beeping audio alert signal after 15 seconds Audio Signal with Audio Output Switch set to B As you move the GA 72Cd across a ferromagnetic object the 40 Hz idling signal which is always present increases in frequency peaks when the locator is directly over ...

Page 6: ...io signal will peak the bar graph will expand positive or negative and the digital readout will peak Figure 5 Searching With the Locator When the GA 72Cd is positioned directly over a vertical pipe the audio and digital indications will peak The expanding bar graph and digital readout may display either a positive or a negative level or Audio Signal Figure 6 The Meter s Polarity Indications Help t...

Page 7: ...or over the ends of a horizontal target The X pattern as shown in Figure 8 is ideal for pinpointing small objects By using this technique a 1 1 4 inch PK nail buried up to 8 inches can be precisely located Figure 8 X Pattern provides Precision Locating If you are looking for a corner marker and detect two more signals in the same general area raise the locator several inches above the ground or re...

Page 8: ...al 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 peak directly over the marker and then decrease at point C From C to D the signals increase and decrease again Therefore if you do not move the locator completely across the marker you may assume that the weaker indication on either ...

Page 9: ...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 that is fixed to the pin For maximum detection the stake should be driven into the ground so that the permanent magnet...

Page 10: ... depths up to 4 feet or AUDIO SIGNAL or Figure 14 Signal Patterns Provided by Septic Tank Covers Locating Objects under Snow or Water and Tracing Barbed Wire The locator can be used in snow or in flooded areas just keep the electronic unit out of the snow or water Figure 15 Locating Objects under Snow or Water ...

Page 11: ... a chain link fence requires a reduced sensitivity setting and some control over the orientation of the locator As illustrated in Figure 17 position the locator horizontally with its long axis perpendicular to the fence This ensures that the upper sensor is kept away from the fence Perform the search by slowly moving the locator forward along the fence while also moving it to the right and to the ...

Page 12: ...ide strong magnetic fields that 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 strongest magnetic signals at their joints or or 1 to1 1 2 Feet Figure 20 Signal Patterns Provided by Cast Iron Pipes ...

Page 13: ...s up to 8 feet Locating Steel Drums As shown in Figure 21 the GA 72Cd s signal pattern will vary depending on the vertical or horizontal orientation of the drum and how deep it is buried A 55 gallon drum can be located at depths up to 8 feet SIGNAL PATTERN FOR DRUMS BURIED APPROXIMATELY 4 TO 8 FEET OR SIGNAL PATTERN FOR DRUMS BURIED APPROXIMATELY 4 FEET OR LESS OR OR OR OR Figure 21 Signal Pattern...

Page 14: ...igure 24 An 81mm Mortar can be located up to 12 inches deep Figure 25 MK81 Low Drag Bombs can be located up to 7 feet deep Figure 26 A hunting knife under water can be located in up to 16 inches of silt Figure 27 A discarded hand gun can be located up to 12 inches deep ...

Page 15: ...a where hazardous materials might be encountered should use the GA 72Cd to search the area prior to drilling Other Notes 1 A burbling sound indicates the presence of an energized power line This will not influence the meter indication unless associated with a magnetic structure 2 The instrument will not respond to non ferrous metals such as gold silver copper brass and aluminum ...

Page 16: ...ovides an analog output signal for input to a data logger This 4 volt signal varies in proportion to signal strength and is accessible by wiring a standard stereo plug Gnd Tone DC Out 4 V FS Figure 28 Stereo Plug Connections for Analog Output Signal ...

Page 17: ...lacement of Batteries The GA 72Cd is powered by two 9 Volt alkaline batteries Access to the batteries is obtained by loosening the four captive screws and removing the electronics cover as shown in Figure 29 It is recommended that you purchase spare batteries for this unit When you use the spare batteries replace them as soon as possible so that you will never be without batteries in the field Fig...

Page 18: ...acts Uncontrollable screaming Weak batteries Replace SERVICE INFORMATION If your locator needs service please return it to the factory with the following information Name Address Telephone and Fax Numbers Email Address Where Purchased Date of Purchase and Description of Trouble s An estimate will be provided prior to service work being done See shipping information below FOR SERVICE OR REPAIR Plea...

Page 19: ...ength 34 5 in 87 6cm Waterproof Length 21 in 53 3cm Nominal Sensor Spacing 14 in 35 6cm Construction Rugged all solid state Units prior to SN 339698 it is recommended to use Lithium batteries Using Alkaline batteries in these units will produce a magnetic field that will impact performance of the locator especially when set to the H or XH sensitivity range This device complies with part 15 of the ...

Page 20: ...riting If the fault has been caused by misuse or abnormal conditions of operation repairs will be billed Specifically this warranty does not cover product that has been subject to inundation by fire water or other liquid intrusion 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 ...

Page 21: ...349 B15002 L55002 1 L55002 2 207220 J10014 Knob Pointer Knob Round Battery Board Assy with Cable Captive Screw 4 Req d Tip Crutch Potentiometer Assembly Gasket Base LCD Meter Switch On Off Sensitivity Battery Chassis Assembly Cover Handle Assembly Screw 6 32 x 2 Req d Headset Optional Case Carrying 9V Alkaline Battery 2 Req d Interface Cable Assembly Buzzer Piezo Latch Latch Keeper End Cap Jack He...

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