INSTRUCTION MANUAL Magna-Trak® Series Magnetic Locator MT200 • MT202 Magna-Trak 200 Series Magnetic Locator • 1
Thank you for purchasing the Magna-Trak ® Magnetic Locator. Please read this manual thoroughly before operation. CONTENTS 1. Introduction .............................................................................................................. 2 2. Theory of Operation ................................................................................................ 3 3. Features ......................................................................................................................
2. THEORY OF OPERATION The 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 magnetically-balanced ≠operating condition. In a uniform magnetic field, such as the earth’s field, the two sensor coils maintain a magnetically-balanced status, because both of the coils experience the same magnetic lines of force.
8. SPECIFICATIONS Power: Six “AA” (11⁄2 volt) batteries Battery life: 100 hours of intermittent operation (alkaline batteries) Output: Powerful magnetic speaker with molded cover to protect from direct contact. LCD Display: Numeric digital, analog Bar-graph, power line indicator and low battery indicator feature Weight: Approximately 2.5 lbs. with batteries Operating temperature: 0°F to 120°F (-18°C to 49°C) Length: 423⁄4 inches (108.6 cm) Construction: High-impact water resistant plastic, epoxy painted.
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4. BASIC OPERATION AND DESCRIPTION 4.1 Power On/Off Switches Press “ON” once to activate the locator circuitry. Press again to turn the battery power off. 4.2 Volume and Sensitivity Control Sensitivity Setting: The sensitivity or depth range can be varied using the “UP” and”“Down” buttons while observing the associated bar graph and two-digit numeric display. When the “UP” or “Down” buttons are pressed, the two-digit numeric display changes from a signal level indication to a sensitivity level indication.
4.4 LCD Visual Display Several visual display functions, provided for ease of operation, are defined below: Digital Signal Indicator A two digit numeric display shows the signal level as related to the audio ≠signal response being heard from the speaker. At the lowest signal level, when no ferrous metal is present, a small number will be viewed (between “0” and”“5”). As metal is approached, the numbers will increase, reaching “99” at its maximum peak.
buried object in search of. The only option is to reduce the sensitivity until the interference from the fence is minimized. However, the locator’s sensitivity to the buried object is also minimized and usually undetectable. The Magna-Trak 202 and its “Erase” feature solves this problem by providing an Erase Button; simply press this button when an object is interfering with the object of interest. The sensitivity is automatically adjusted to enhance the detection of the object of interest.
6. FIELD OPERATION The recommended search position is a 45° angle from the earth’s surface. Scan the locator pole from side-to-side in a slow sweeping motion while walking in a steady direction. Maintain a consistent height above the ground during the side-to-side sweeping motion. Physical "X" Motion Shown Locator's Electrical Response Representation Fig.
7. SIGNAL RESPONSE Figure 7 shows audio and LCD visual signal response 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 bar-graph response as the locator passes over the ground. Sensit Sensit ivity e e Erase e Erase Magna-Trak Erase Magna-Trak ® Magna-Trak 200 Series Magna-Trak ® Magna-Trak 200 Series ® Magna-Trak 200 Series Fig.
7.1 Typical Signal Responses The metal handles on the septic tank cover will provide a usable signal to determine the location of the actual cover (Fig. 8). Signal Response Fig. 8 Large metal objects may cause double signals as indicated (Fig. 9). Signal Response 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. Sewer Cover Fig.
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