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EM 61 Time Domain Metal Detector
Features
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Time-domain metal detector that
detects both ferrous and non-ferrous metals.
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Powerful transmitter generates
a pulsed primary magnetic field in the earth that
induces eddy currents in nearby metallic objects.
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Can Detect a single 200-liter
(55 gal) drum at a depth of over 3 meters beneath
the instrument.
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Relatively insensitive to
nearby cultural interferences such as fences,
buildings and power lines.
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Can be pulled around as a
trailer with an odometer mounted on the axle to
trigger the data logger, or it can be carried by a
single operator with a shoulder harness.
General
The EM 61 is a time-domain metal
detector that detects both ferrous and non-ferrous
metals. A powerful transmitter generates a pulsed
primary magnetic field in the earth that induces eddy
currents in nearby metallic objects. The eddy current
decay produces a secondary magnetic field measured by
the receiver coil.
By taking the measurement a
relatively long time after the start of the decay, the
current induced in the ground has fully dissipated and
only the current in the metal is still producing a
secondary field. The responses are recorded and
displayed by an integrated data logger.
The EM 61 can detect a single
200-liter (55 gal) drum at a depth of over 3 meters
beneath the instrument, yet is relatively insensitive to
nearby cultural interferences such as fences, buildings
and power lines. The response is a single, sharply
defined peak, greatly facilitating quick and accurate
location of the target. Depth of the target can usually
be estimated from the width of the response.
The system can be pulled around as
a trailer with an odometer mounted on the axle to
trigger the data logger, or it can be carried by a
single operator with a shoulder harness.
Specifications
Time Gates:
Gate 1: 0.05ms wide, starting
0.18ms after pulse
Gate 2: 0.4ms wide, starting 0.45ms after pulse
Weights:
Operational Backpack: 10kg
Coil: 9kg
Shipping 61kg (86kg with trailer)
Dimensions:
Backpack: 60x 30x 10cm
Coil: 100x 100x 5cm
Shipping 106 x 106 x 20cm
| Measured Quantities: |
Two channesl of secondary
response in mV |
| EM Source: |
Air-cored coil, 20 cm
diameter |
| Current Waveform: |
Bipolar rectangular
current with 25% duty cycle |
| EM Sensor: |
Air-cored coil, 20 cm
diameter |
| Measuring Ranges: |
40,000 mV for low gain,
10,000 mV for high gain |
| Dynamic Range: |
18 bits |
| Output Monitors: |
4-line LCD with 16
characters per line, and audio tone |
| Data Storage: |
18,700 records (ext.
memory available) |
| Data Output: |
RS232 serial port |
| Power Supply: |
12V rechargeable battery
for 4 h continuous operation |
| Operating Weight:
Backpack: |
10 kg, Sensor Assembly:
2.8 kg (7.5 kg eith wheels) |
| Dimensions: |
Backpack: 60 x 30 x 10 cm,
Sensor Assembly: 33 x 20 cm |
Standard Components
Backpack, data logger, shipping
case and instruction manual.
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