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BSS-02B Borehole Sonde

Borehole magnetic susceptibility sonde BSS-02B 

The BSS-02B is a borehole probe used for the measurement of rock magnetic susceptibility to depths of 6000m. BSS-02B is mainly used for mineral exploration (uranium, iron, diamonds) or sedimentology.

It comprises two sections: an aluminium cylindrical enclosure containing electronic circuitry, and a high-strength, non-magnetic enclosure where the detector is located. The electronics enclosure must be surrounded by a pressure enclosure, usually provided by a downhole logging system supplier alongside the transmission electronics.

The sonde operates from an unregulated 15V nominal supply and provides an output in the form of a three-wire CMOS serial interace (for integration into your acquisition system) and a single wire pulse rate output for use with rate meters and counters.

Typical applications

This borehole magnetic susceptibility sonde is used for mineral prospecting, including the discrimination of kimberlites, iron ore and uranium ore. It is also used for stratigraphic correlation, delineation of alteration fronts, delineation of strata of economic interest, and evaluation of the ore's grade.


  • Very wide measuring range: 10-5 to 10-1 cgs
  • Low operating frequency: 1.36kHz
  • Good vertical resolution: 25mm with dual coil system
  • Operates to pressures of 10,000 psi maximum
  • Operates to temperatures of 120⁰C: calibrated to 90⁰C
  • Fast: measures at up to 21 readings per second
  • Low temperature-induced drift: < 20 x 10-5 cgs over the calibrated temperature range ambient to 90⁰C

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