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QL40-HM – Magnetic Susceptibility



The QL40-HM borehole magnetic susceptibility tool is typically used in mining, geotechnical, and lithology applications. All electronic circuitry resides in a high strength non-magnetic enclosure. The operating frequency is chosen to be sufficiently low to avoid interference from rock conductivities and the circuitry is temperature compensated to minimize thermally induced drift. The QL40-HM is offered with one or two measuring ranges and will resolve strata down to 25 mm. Probe response is practically instantaneous (<0.5s).

The extended range is designed for measurements in complex igneous or metamorphic rocks up to high magnetite rocks. This extended range has been chosen so as to identify layers containing magnetite (0.005 – 100%). The main use of the probe is for prospection on deposits of Fe minerals – magnetite, pyrite and hematite. These data are to be used for quantitative interpretation of the magnetic components in the rocks and estimation of the thickness of layers. In this way, the QL40-HM can directly be used for economic evaluation of the deposit.

The QL40-HM tool is offered in standard range, extended range, dual range magnetic susceptibility, and as a combination tool with induction. All of these options are stackable within the Quick Link (QL) product line or can be run as a standalone tools.


Operating Conditions

Borehole Fluid
[X] Water
[X] Mud
[X] Dry

[X] Uncased
[X] PVC Borehole
[_] Steel

[_] Required
[X] Non-Required

Features & Benefits

Specifications – Metric/English

Specification Metric Imperial
Diameter 45 mm 1.77″
Length 1.5 m 59″
Weight 7 Kg 15 lbs.
Max. Temp. 70ºC 158ºF
Max. Pressure 200 bar 2900 psi


Sensor: Two coil system
Intercoil Spacing: Standard – 25 cm
Intercoil Spacing: Extended – 30 cm
Range: Standard – 10-5 to 0.5 SI units
Range: Extended – 10-4 to 2 SI units
Operating Frequency: ~2 kHz
Accuracy: < 3% F.S.
Zero Drift: Standard – < 2.10-5 SI units/ 10ºC
Zero Drift: Extended – < 1.10-4 SI units/ 10ºC

QL Stack Possibilities


Data Sheet

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