Bob Ebberson and Michael B. Head

Mine clearance with the GA-72Cd locator.

»Click here for photos of field usage

How Locators Work

Schonstedt magnetic locators operate on the principle of magnetic fluxgate. The fluxgate consists of two sensors separated by a fixed distance and mechanically aligned. In the absence of a ferromagnetic material, the earth magnetic flux is the same at both sensors, therefore the fluxgate output is zero. When an object close to the bottom sensor alters the earth magnetic flux due to its own magnetic field, the balance of the gate is altered, producing a measurable output.

Magnetic locators detect ferrous metals exclusively. They will not detect non-ferrous metals such as aluminum, brass or copper. The benefits of a ferrous metal locator is that it will not register 'false positives' caused by non-ferrous metals, and will detect ferrous metals to a much greater depth than an all-metal detector. Depending on its mass, the magnetic locator will detect a ferrous metal target to a depth of 30 feet.

The detection range is greatly dependent on the mass and orientation of the target, ranging from a couple of centimeters to several meters. Targets are limited to ferromagnetic materials—iron, steel and alloys.

Magnetic Locator Comparison Chart

 
GA-52Cx
GA-72Cd GA-92XTd
Major features Most Sensitive
Least Expensive
The "Original"
Most Rugged
Most Popular for UXO and Demining Applications
Most Portable
Comes with Holster
Smallest
Most Ergonomic
Output      
    Audio
Yes
Yes
Yes
    Visual
No
Yes
Yes
Indicators      
   Battery
No
Yes
Yes
   Sensitivity
No
Yes
Yes
Sensitivity controls
5 levels
4 levels
Continuous

» Download Magnetic Locators vs. Metal Detectors Chart (PDF)


Main Switchboard: 1-800-999-8280 • 100 Edmond Road Kearneysville, WV 25430 • Email: info@schonstedt.com © 2009 Schonstedt Instrument Co.