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Related Manuals for Schonstedt Instrument MAC-51Bx
Summary of Contents for Schonstedt Instrument MAC-51Bx
- Page 1 Instruction Manual Model MAC-51Bx Magnetic and Dual-Frequency Pipe and Cable Locator Manufactured by Schonstedt Instrument Company 4 Edmond Road Kearneysville, WV 25430 Telephone: (304) 725-1050 Fax: (304) 725-1095 February 2000...
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Page 2: Table Of Contents
Isolators and Signal Path Continuity (HI Mode) Isolators and Inductive Excitation (HI Mode) Isolators and Conductive Excitation (HI and LO Modes) Determining Target Depth by Triangulation Section VI Maintenance Replacement of Receiver Batteries Replacement of Transmitter Batteries Receiver Troubleshooting Guide Schonstedt Instrument Company... - Page 3 Warranty LIST OF FIGURES Figure Title Page MAC-51Bx Magnetic and Dual Frequency Pipe and Cable Locator Detecting Magnetic Field of an Iron Marker Normal Range Gain Setting Low Range Gain Setting High Range Gain Setting Signals from Vertical and Horizontal Targets “X”...
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Page 4: Section I General
General Introduction The all purpose MAC-51Bx Magnetic and Dual-Frequency Pipe and Cable Locator is the only underground locator that combines magnetic locating (for iron and steel objects) with dual-frequency cable/line tracing into one compact system. The system consists of two major units: a dual-frequency (LF and HF) transmitter and a three-mode receiver (MAG, LO and HI). -
Page 5: Optional Inductive Signal Clamp
As the MT-2 (Mole) is pushed through a buried nonmetallic pipe, it emits a signal that can be detected at depths up to 18 feet by using the MAC-51Bx receiver. The Mole has a concave surface so it can be secured with electrical tape to a plumber or electrician’s snake, or it can be closed in a pipe “PIG”. -
Page 6: Specifications
MAC-51Bx Specifications TRANSMITTER Operating Voltage 12V (8 alkaline C-Cell batteries) Battery Life 60 hours (on & off usage @ 70F) RF Output 82.5 kHz modulated at 382 Hz, Pulsed at 4.4 Hz 571 Hz pulsed at 4.4 Hz Audio Indicator 2.58 kHz pulsed at 4.4 Hz... -
Page 7: Theory Of Operation
Theory of Operation In the Magnetic (MAG) mode, the MAC-51Bx receiver responds when the magnetic field strength at the two sensors, which are 20 inches apart, is different. This response consists of a change in the idling frequency of the audio signal emitted from the speaker. -
Page 8: Mode Selection And Gain Setting
Unwanted background signals due to nearby magnetic objects may require that the effective range of the locator be reduced. This is accomplished by turning the Gain control towards LO. Reduced range is also useful for pinpointing the location of a strongly magnetized marker (see Figure 3-2). Figure 2-3. Low Range Gain Setting Schonstedt Instrument Company... -
Page 9: High Gain Operation
This might produce unwanted variations in the output signal. The pres- ence of a ferromagnetic object will be indicated by a change in the tone of the output frequency. Figure 2-5. Searching with the Locator Schonstedt Instrument Company... -
Page 10: Section Iii Magnetic Locating Mode Application Notes
The signal from a rusty bolt or other small item will decrease much faster with distance than the signal from a larger target such as a corner marker. An 18-inch length of 3/4-inch pipe can be located at depths up to 9 feet. Schonstedt Instrument Company... -
Page 11: Strongly Magnetized Markers
C. From C to D the pattern is the reverse of that form A to B. It is obvious that the locator must enter the B-C region. Otherwise the marker might be assumed to be between A and B or C and D. SIGNAL PATTERN IRON PIPE Figure 3-4. Signal Pattern from a Strongly Magnetized marker Schonstedt Instrument Company... -
Page 12: Locating Manholes, Septic Tanks And Water Wells
18 feet deep. Figure 3-5. Locating Manhole Covers Figure 3-6. Locating Water Well Casings The MAC-51Bx receiver can be used to precisely locate the metal handles or reinforcing bats on septic tank covers at depths up to 4 feet OUTPUT SIGNAL Figure 3-7. -
Page 13: Locating Items Under Snow Or Water And Tracing Barbed Wire
Tip the locator a little lower than usual - but not parallel with the ground. First, examine trees for benchmarks and bits of embedded barbed wire. The hold the locator parallel with the direction of the wire. Figure 3-9. Tracing Barbed Wire from Old Fence Lines Schonstedt Instrument Company... -
Page 14: Searching Areas Along A Chain Link Fence
Figure 3-11. Any variation in the position of the locator will produce an abrupt rise in the frequency in the tone. Figure. 3-11. Placement of Locator while Searching Along a Chain Link Fence Schonstedt Instrument Company... -
Page 15: Locating Valve Boxes
5. Return to an area of maximum signal strength and hold the locator several inches above the surface. The gain setting will probably have to be reduced during this second pass. Four-inch, cast-iron pipes can be located at depth up to 10 feet. Schonstedt Instrument Company... -
Page 16: Locating Steel Drums
Locating Steel Drums As shown on Figure 3-14, the MAC-51Bx’s signal pattern will vary depending how deep the drum is buried. A fifty-five gallon drum can be located at depths up to 10 feet. SIGNAL PATTERN FOR DRUMS BURIED APPROXIMATELY 4 TO 10 FEET SIGNAL PATTERN FOR DRUMS BURIED APPROXIMATELY 4 FEET OR LESS Figure 3-14. -
Page 17: Section Iv Cable And Line Tracing
B and decrease to a minimum directly over the target. At C the pitch again increases and then decreases at D. The MAC-51Bx can be used to trace any long conductive element such as a anode string or metalized warning tape as well as cable and pipe. -
Page 18: Transmitter, Turn-On And Battery Check
Set the ON/OFF switch to on and listen for a steady beeping sound. If a beeping is not heard, the batteries must be replaced as described on page 6-1. ACCESSORY JACK CARRYING CASE ON/OFF SWITCH INSIDE BASE TRANSMITTER ANTENNA ELECTRONICS Figure 4-3. Transmitter Features Schonstedt Instrument Company... -
Page 19: Conductive Signal Coupling (For Hi And Lo Modes)
Clipping to power lines is dangerous and should not be attempted. Insulation on the clip is not designed to protect against power line voltages. STAKE CLIP CABLE CLIP ACCESSORY JACK Figure 4-5. Transmitter Hookup For Conductive Coupling Schonstedt Instrument Company... -
Page 20: Inductive Signal Coupling With Signal Clamp (For Hi Mode Only)
Mode, you should move the receiver at least 20 feet away from the transmitter to start tracing to avoid picking up the HF tracing signal through the air directly from the transmitter. You will have to increase the Gain as the distance between the receiver and transmitter increases. Figure 4-7. Gain Setting for Normal Range Schonstedt Instrument Company... -
Page 21: Gain Settings For Tracing A Cable Or Line
The null appears directly over the target only when the receiver is held in a vertical posi- tion. If it is held at an angle, the null will not indicate the exact location of the target line. Schonstedt Instrument Company... -
Page 22: Conductively Applied Tracing Signals (For Hi And Lo Modes)
WARNING Clipping to power lines is dangerous and should not be attempted. Insulation on the clip is not designed to protect against power line voltages. STAKE CLIP CABLE CLIP ACCESSORY JACK Figure 4-10. Conductively Applied Tracing Signal Schonstedt Instrument Company... -
Page 23: Section V Cable And Line Tracing Application Notes
Electrical contact must also be made to the ground by using the supplied stake. For the best results, drive the stake into the ground as far off to the side of the line as the connecting cable will permit (See Figure 5-2). Schonstedt Instrument Company... -
Page 24: Conductive Coupling For Cable And Line Tracing In The Lo Mode
(magnetic or nonmagnetic) in the MAG Mode, trace the cable using the LO Mode to locate the break (where the signal disappears), and continue tracing beyond the break in the HI Mode. GROUND CLIP TRACING TO STAKE (LO MODE) TRACING (HI MODE) CONDUCTION BREAK CLIP TO CABLE LOCATED Figure 5-3. Coductive Coupling for Break Locating Schonstedt Instrument Company... -
Page 25: Dealing With Clutter Signals (Hi Mode)
B. SIGNAL A SIGNAL B Figure 5-5. Single Lobe Identification Technique Schonstedt Instrument Company... -
Page 26: Bends And Junctions (Hi And Lo Mode)
Magnetic (MAG) Mode Aids in Interpreting Ground Clutter The MAC-51Bx has a unique feature designed to help you unscramble underground clutter. It is the option of switching to the MAG mode for a different indication of what other category of targets are in the immediate vicinity. In this mode,... -
Page 27: Isolators And Signal Path Continuity (Hi Mode)
As you become more familiar with the MAC-51Bx System, you will find that switching between MAG, HI and LO modes becomes an invaluable tracing aid when underground cutter is encountered. -
Page 28: Isolators And Conductive Excitation (Hi And Lo Modes)
So if there is a ground wire in place, disconnect it from pedestal before connecting the conductive cable clip to the shield to ensure that a strong tracer current is applied to the cable. ACCESSORY CLIP STAKE JACK GROUND WIRE CLIP Figure 5-9. Pedestal with Ground Wire Removed Schonstedt Instrument Company... -
Page 29: Determining Target Depth By Triangulation
“Simple geometry calculations never give an incorrect indication of depth.” Push-Button depth indications provided by some products are affected by soil composition, salinity, and moisture content and have been reported to be off by up to 2-1/2 feet. Schonstedt Instrument Company... -
Page 30: Section Vi Maintenance
Section VI Maintenance The MAC-51Bx system is built to give trouble-free operation. Normally, maintenance is limited to the occasional replace- ment of batteries. In the event that a malfunction does occur, refer to the appropriate Troubleshooting Guide on page 6-3. They list a few possible problems that can generally be corrected in the field so that you will be able to continue using the locator without interruption. -
Page 31: Replacement Of Transmitter Batteries
SPARE BATTERIES (USER SUPPLLIED) BATTERY BOX TERMINALS REMOVE BATTERIES FROM ENDS OPPOSITE SPRINGS FIRST. INSTALL BATTERIES AGAINST SPRINGS FIRST. COIL SPRINGS Figure 6-2. Replacement of Transmitter Batteries Schonstedt Instrument Company... -
Page 32: Receiver Troubleshooting Guide
If the locator need service, please return it to the factory along with the following information: Name, Address, Where Purchased, Date and Description of Trouble(s). A telephone estimate will be provided prior to service work being done. See shipping information on Page 6-6. Schonstedt Instrument Company... - Page 33 302301 SPEAKER MODULE 208306 BATTERY HOLDER & BD ASSY. 208369 COVER WITH LABEL K20021 KNURLED KNOB (2) 207215 CAP KIT WITH SCREEN 206006 SCREEN 208212 CRUTCH TIP (BLACK) 302284 CHASSIS 208406 INTERFACE CABLE ASSY. Figure 6-3. MAC-51Bx Receiver Repair Parts...
- Page 34 KNURLED NUT (2) B11009 BATTERY, C TYPE (8) 207315 BATTERY CASE 302307 CONDUCTIVE CLAMP 208263 GROUND STAKE 301646 INDUCTION CLIP* MT-2 MINI-TRANSMITTER (MOLE)* B11014 BATTERY, 9V LITHIUM (2 SPARE) L55002-1 LATCH L55002-2 LATCH KEEPER Figure 6-4. MAC-51Bx Transmitter Repair Parts...
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Page 35: Warranty
Limited Warranty The Schonstedt Instrument Company (Schonstedt) warrants each product of its manufacture to be free from defects in material and workmanship subject to the following terms and conditions. The warranty is effective for three years after shipment by Schonstedt to the original purchaser.
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