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EM 39 Induction Probe
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Features

  • Provides measurement of the electrical conductivity of the soil and rock surrounding a borehole or monitoring well.
  • Employs coaxial coil geometry with an intercoil spacing of 50cm to provide a substantial radius of exploration into formations while maintaining excellent vertical resolution.
  • Operates to a depth of 500 meters.
  • Applications include groundwater contamination monitoring, groundwater and mineral exploration, and general geotechnical operations.
  • Measurements can be recorded with a data logger or viewed in real time using a field computer.

     

General

Using the inductive electromagnetic technique, the EM39 provides measurement of the electrical conductivity of the soil and rock surrounding a borehole or monitoring well. The unit employs coaxial coil geometry with an intercoil spacing of 50cm to provide a substantial radius of exploration into a formation while maintaining excellent vertical resolution. Measurement is unaffected by conductive borehole Quid or the presence of plastic casing. The instrument operates to a depth of 500 meters.

The combination of a large conductivity range, high sensitvity and very low noise and drift, allows accurate measurement of subsurface conditions. Typical applications include groundwater contamination monitoring, groundwater and mineral exploration, and general geotechnical operations.

The 4-conductor EM39 probe can be used with many available borehole logging systems or with the dedicated winch and console system.

Measurements can be recorded with the DL720 digital data logger, or viewed in real time using a field computer and the EM39RT program.

Specifications

Weights: Probe: 2.2kg
Shipping: 90kg (2 boxes)
Measured Quantity: Apparent conductivity in millisiemens per meter (mS/m)
Primary Field Source: Self-contained dipole transmitter
Sensor: Self-eontained dipole receiver
Intercoil Spacing: 50cm
Operating Frequency: 39.2kHz
Conductivity Ranges: +100, 1000, 10000mS/m
Depth: 200m (500m cable optional)
Measurement Precision: 0.1% of full scale deflection
Measurement Accuracy: 5% at 30mSlm
Noise Level: <0.5mS/m
Power Supply: 10 disposable "D" cells, or 12 VDC external power source
Dimensions: Probe: 3.6cm diameter, 157cm length

Standard Components

EM39 probe and instruction manual.