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EM 61 Time Domain Metal Detector
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Features
  • Time-domain metal detector that detects both ferrous and non-ferrous metals.
  • Powerful transmitter generates a pulsed primary magnetic field in the earth that induces eddy currents in nearby metallic objects.
  • Can Detect a single 200-liter (55 gal) drum at a depth of over 3 meters beneath the instrument.
  • Relatively insensitive to nearby cultural interferences such as fences, buildings and power lines.
  • 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.