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EM 31-MK2 Ground Conductivity Instrument
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Features
  • Maps geological variations, goundwater contaminants, or any subsurface feature associated with changes in ground condutivity.
  • Surveys are readily carried out in all regions, including those of high surface resistivity such as sand, gravel and asphalt.
  • Efffective depth of exploration is approximately six meters.
  • Two digital meters display both the quadraturephase and inphase components that can be recorded simultaneoulsy on the DL-720 digital data recorder.
  • Inphase component is extremely useful for for detecting shallow ore bodies and, in waste site sureveys, for searching for buried metal drums, pipes, and other ferrous and non-ferrous metallic debris.
General

The EM 31- MK2 is an updated version of the standrd EM 31 with the data logger now incorporated into the control console. The data logger is readily removed from the console for easy data handling, or to hand carry during the survey. Real-Time logging is available by connecting a computer directly to the RS-232 output port on the front panel. This option requires the purchase of a special RS-232 interconnect cable.

The EM 31-MK2 maps geological variations, groundwater contaminants or any subsurface feature associated with changes in the ground conductivity using a patented electromagnetic inductive technique that makes the measurements without electrodes or ground contact. With this inductive method, surveys are readily carried out in all regions including those of high surface resistivity such as sand, gravel and asphalt.

The effective depth of exploration is about six meters, making it ideal for many geotechnical and groundwater contaminant surveys. The EM 31 has the following important advantages over conventional resistivity methods: high speed surveys, precision measurement of small changes in conductivity, and continuous read-out while traversing survey areas.

Two digital meters display both the quadrature-phase (conductivity) and inphase components that can be recorded simultaneously on the DL 720 digital data recorder. The inphase component is especially useful for detecting shallow ore bodies and, in waste site surveys, for searching for buried metal drums, pipes, and other ferrous and non-ferrous metallic debris.

With the capability of simultaneously mapping contaminant plumes and buried metal, the EM 31 is the ideal tool for site assessment surveys.

Specifications

Measured Quantities:

  • Apparent conductivity of the ground in millisiemens per meter (mS/m)
  • Inphase ratio of the secondary to primary magnetic field in parts per thousand (ppt)

Measuring Ranges:

  • Conductivity: 10,100,1000 mS/m
  • Inphase: 12ppt

Dimensions:

  • Boom: 4.0m extended, 1.4m stored
  • Console: 24 x20 x18cm

Weight:

  • Instrument: 11kg
  • Shipping: 26kg

Noise Levels:

  • Conductivity: 0.1mS/m
  • Inphase: 0.03ppt

Primary Field Source: Self-contained dipole transmitter
Sensor: Self-contained receiver
Intercoil Spacing: 3.66 meters
Operating Frequency: 9.8kHz
Power Supply: 8 disposable alkaline "C" cells (approx. 20 continuous hrs)
Measurement Precision: 0.1% of full scale deflection
Measurement Accuracy: 5% at 20 mS/m

Standard Components

Complete field unit includes console, transmitter/receiver boom, carrying harness, transit case, and instruction manual.