Owner’s Instruction Manual MAGNA-LOCK M AG NA -L OC K Magnetic Locator Distributed by: 1-800-HEATH-US www.heathus.
Table of Contents Introduction .......................................................... 2 Theory of Operation ............................................ 3 Features ............................................................... 4 Pictorial Description............................................. 5 Basic Operation and Description .................... 6-9 Field Operation ..................................................10 Signal Responses .......................................
Theory of Operation The Magna-Lock locator finds ferromagnetic objects by sensing the magnetic field radiated by the object. The locator contains two sensor coil assemblies that are precisely spaced and electronically balanced to achieve a near magnetic balanced operating condition. In a uniform magnetic field, such as the earth’s field, the two sensor coils maintain a magnetic balanced status, because both of the coils experience the same magnetic lines of force.
Features 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16.
MAGNA-LOCK 5
Basic Operation and Descriptions Power On Button: Press once to activate the locator circuitry. Simultaneously, the circuitry is automatically set to the proper audio tone. Power Off Button: Press once to turn the battery power off. Volume Control: Rotate the knob to the desired audio sound level. Full volume is achieved when the knob is turned full clockwise. Sensitivity Control: The sensitivity or depth range can be varied with the rotation of the sensitivity knob.
Analog Bar-Graph Signal Indicator - the bar graph corresponds directly to audio frequency by expanding outward from the center “diamond” as the signal increases due to magnetic metals. Low Battery Indicator - Although not visible under normal conditions the LCD will display a flashing “Low Battery” warning when the batteries fall below a predetermined voltage. This alerts you to replace the batteries soon. Several hours of battery life remains. However, in cold temperatures this usable time may be shorter.
MAGNA-LOCK Erase Button: This is an optional button that is primarily used in locations where large metal objects normally interfere with the desired operation of magnetic locators. Cyclone fences, metal buildings, vehicles and other large magnetic objects can be electronically erased with this button. The operation of this feature is best defined by explaining the typical locator without this feature.
lar area around the position of the locator in which the erase button was pressed. This circular area, referred to as the erase zone, may be affected by the magnitude of the magnetic field of the fence and the distance from the fence when the button was pressed. In extreme cases, there may be a point where you may have to press the Erase button again as you approach the fence.
Field Operation The recommended search position is a 45 degree angle from the earth’s surface. Scan the locator pole from side-to-side in a slow sweeping motion while walking in a uniform direction. Once the object being searched is located, pinpointing the objects location can be accomplished by holding the locator vertical and sweeping it in an “X” pattern until the absolute peak is found. Maintain a consistent height above the ground during the side-to-side sweeping motion.
Signal Response Below is an example of audio and LCD visual signal responses to (1) no object, (2) one small deeper metal target and (3) a second larger and shallower metal object. The LCD display indicates both the numeric digital and analog bargraph response as the locator passes over the ground.
Typical Signal Responses The metal handles on the septic tank cover will provide a usable signal to determine the location of the actual cover. The metal handles on a septic tank cover Large metal objects may cause double signals as indicated. The center of the cover is found by sweeping the locator back and forth to create a ring pattern response. The center null will designate the cover’s center.
Typical Signal Responses Water Locations: The locator can be submerged into water with the pole section to just under the plastic case. Hold the locator in a vertical position while searching to produce the best results. The joints, elbows and ends will create the strongest signals. Cast iron pipe, joints, elbows, etc.
Locating Near a Steel Fence Approach the fence and stop at the distance at which you wish to begin your search. While holding the locator in a vertical position, press and release the "erase" button on the membrane panel. Begin sweeping the locator side to side parallel to the fence. As you move toward or away from the fence during the sweeping motion, at some point you may have to press the "erase" button again. Continue this process throughout the search.
Specifications Power: Six AA 1 1/2 volt batteries Battery Life: 100 hours of intermittent operation (alkaline batteries) Output: Powerful magnetic speaker with water proof Mylar cone. LCD Display: Numeric digital, analog Bar-graph and low battery indicator feature. Weight: Approximately 3 Ibs. (1.3kg) with batteries. Operating Temperature: 0°F to 120°F (-18°0 to 49°C). Length: 40 inches (101.6 cm.). Construction: High impact plastic, water resistant, light weight and epoxy painted.
Corporate 9030 Monroe Rd Houston, TX 77061 1-800-HEATH-US www.heathus.
