Schonstedt Magnetic Locator Model MAC 51Bx

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The MAC-51Bx was discontinued by Schonstedt and is no longer available for purchase. This is a great tool as it handled dual-purpose functions. It was a Pipe/Cable Locator and a Magnetic Locator. If you're looking for a Pipe/Cable Locator and a Magnetic Locator we suggest that you purchase the XTpc and the GA-52 separately. While suggesting buying two tools instead of one was not the goal of the manufacturer, manufacturing the MAC-51Bx was not the direction they decided to take.

The MAC-51Bx is the most cost-effective, all-purpose locating system on the market. It consists of a magnetic locator, similar to the most popular GA-52Cx model, and a null-over-target pipe and cable locator capable of locating on two frequencies: 571Hz and 82.5kHz.

In the LO and HI modes, the receivers audio signal provides a sharp null when its tip is directly over the target. In the MAG mode (no transmitter required) the audio signal peaks when the receiver's tip is over the target. You can trace the 571 Hz LF signal conductively applied to any continuous metal conductor up to 4000 feet.

The receiver's on-the-fly mode-changing feature lets you locate a complete break using the LO mode, and then continue on to trace beyond the break in the HI mode, or trace a metal pipe joined with non-conductive gaskets.

The MAC-51Bx by simultaneously transmitting 82.5 kHz (HF) and 571 Hz (LF) signals lets you select and compare received audio signals from both frequencies along with magnetic information without having to return to the transmitter.

Transmitter Inductive Mode (HF only) Induction is achieved by placing the transmitter over the target cable/pipe or by using the optional Inductive Signal Clamp. It's the easiest and quickest way to applying a trace signal that is strong enough for tracing most lines. The trace signal generates an alternating magnetic field around the cable which induces a signal into the receiver's cable sensor. A sharp null in the audio signal between the two peaks occurs when the receiver's tip is directly over the cable.

Transmitter Conductive Mode
If an exposed section of a target gas or water pipe is accessible, conductive coupling is the most reliable method for applying the trace signal. This mode has to be used to apply both HF and LF frequencies so that you can use all three features on-the-fly. Providing a good electrical contact between the clip and the conductive portion of the target line by removing rust or paint before attaching the clip is very important.

Magnetic Locating Mode
Only the MAC-51Bx receiver is required when operating in the magnetic mode. Just set the Mode switch to MAG, the Gain control to mid-range, and you're ready to locate underground ferrous pipes, water meters, water valves, and property markers - or anything that has a magnetic field including the 50/60Hz electro-magnetic field generated by energized power lines.

Three Year Warranty
Two active frequencies for pipe, cable and line tracing
Passive operation for locating iron and steel targets and energized 50/60Hz power lines
Inductive and conductive signal coupling
Extra Heavy Duty Clips and Cable
Five discrete sensitivity settings
Receiver supplied with two environmentally friendly 9-volt lithium batteries
Piezoelectric Speaker
45º Depth Measurement
Patented HeliFlux Sensors

Operating Voltage: 9V (2 alkaline or 2 lithium batteries)
Battery Life: 60hrs, alkaline (on & off usage @ 70ºF), 120 hrs, lithium (on & off usage @ 70ºF)
Audio Output: Approx. 40 Hz idling tone from speaker
Frequency of pulsing tone (increases or decreases) with signal intensity Weight: 2.64 lb. (1.20 kg.)
Operating Temp: -13oF to 140oF (-25oC to 60oC)
Overall Length: 42.3 in. (107.4 cm.)
Waterproof Length: 34.5 in. (87.6 cm.)
Nominal Sensor Spacing: 20 in. (50.8 cm.)

Operating Voltage: 12V (8 alkaline C-Cell batteries)
Battery Life: 60 hours (on & off usage @ 70ºF)
RF Output: 82.5 kHz modulated at 382 Hz, pulsed at 4.4Hz
571 Hz Pulsed at 4.4 Hz
Audio Indicator: 2.58 kHz pulsed at 4.4 Hz
Weight: Approx 5.5 lb. (2.5 kg.)
Operating Temp: -13oF to 140ºF (-25ºC to 60ºC)
Overall Size: 43.5 in. x 7 in. x 5 in.
(110.5 cm x 17.8 cm. x 12.7 cm.)

The MAC-51Bx comes standard with:
Custom Hard Case designed to withstand the rigors of field use (Case is Transmitter)
Receiver (wand)
Instruction Video
Users Manual
Conductive Cable and Clips Assembly (8 Ft long cable with two size clips: 1 large, 1 small)

Optional equipment sold separately:
MOLE MT-2 Transmitter
Head Phones
Inductive Signal Clamp