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CMD - Multidepth Electromagnetic Conductivity Meters


Overview Technical specifications Downloads

The instrument consists of the control unit and probe(s).


Control Unit:

  • Attachable CMD control unit works with all types of probes.
  • Five modes of measurements:
    • Manual measurement – the user starts measurement at each point by pressing the key or by buttons. The point position is updated automatically in the preset grid or can be entered directly. Each point can be re-measured or skipped and completed with a comment.
    • Continuous measurement – data are measured and saved continuously in chosen measuring period. The positions on the profile are determined by length marks with consequent recalculation of positions of individual readings.
    • GPS Manual measurement – the user starts measurement at each point by pressing the key or by button. The position is measured by GPS receiver.
    • GPS Continuous measurement – data are measured and saved continuously in chosen measuring period. The position is localized by GPS receiver.
    • Search mode – data are measured continuously but are not saved. On-the-fly data transmission to external device (PC or other) via RS232.
  • Map preview of measured area (up to 15000 positions).
  • In-situ 1D inversion (two-layered).
  • Integrated Bluetooth wireless technology.
  • Direct support of GPS receiver. Longitude, latitude and altitude are shown and saved automatically. UTM/UPS recalculation is possible.
  • Easy USB data transfer or direct saving on USB flash disk.
  • Factory and user calibrations (calibrating data are stored in the probe).
  • Measurement time: 0.1 – 20 s.
  • 128 MB data memory stick:
    • max. 64 files.
    • max. 4.8 million measured points.
  • Graphical LCD display 320 x 240, white backlight.
  • Power supply:
    • Internal exchangeable rechargeable Li-Ion battery pack (integrated fully automatic intelligent battery charger).
    • Working time: 3 - 4 working days (24 - 32 hours of continuous measurement).
    • Internal exchangeable battery holder for 6 x AA single-use or rechargeable NiCd or NiMh batteries.
  • Operating temperature: -10 °C to +50 °C.
  • Dimensions: 270 x 90 (145) x 60 mm.
  • Weight: 0.7 kg (with Li-Ion battery pack).

Probes:

  • Measured quantities:
    • Apparent conductivity in mS/m.
    • In-phase ratio in ppt (magnetic susceptibility).
  • Measuring ranges:
    • Apparent conductivity: 1000 mS/m, resolution 0.1 mS/m.
    • In-phase ratio: ± 80 ppt, resolution 10 ppm.
  • Measurement accuracy: ± 4% at 50 mS/m.
  • Temperature stability: better than 0.1 mS/m /°C (at slow temp. changes).
  • Maximum sampling rate: 10 Hz.
  • Full and half depth range (vertical and horizontal orientation of dipoles).
  • Operating temperature: -10 °C to +50 °C.

Probe Effective High/Low Depth Range. Dipole Center Distance. Working Weight.
CMD-Tiny 0.7 / 0.35 m 0.45 m 0.4 kg
CMD-1 1.5 / 0.75 m 0.98 m 2.5 kg
CMD-2 3.0 / 1.5 m 1.89 m 3.6 kg
CMD-4 6.0 / 3.0 m 3.77 m 6.8 kg
CMD-4/6 6.0 / 3.0 m or 3.77 m or 6.1 kg or
9.0 / 4.5 m 5.79 m 8.9 kg
CMD-Explorer 2.2 / 1.1 m 1.48 m 8.0 kg
4.2 / 2.1 m 2.82 m
6.7 / 3.3 m 4.49 m
CMD-MiniExplorer 0.5 / 0.25 m 0.32 m 2.0 kg
1.0 / 0.5 m 0.71 m
1.8 / 0.9 m 1.18 m

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