QL40-IP Induced Polarization Borehole Example Data
QL40-IP Probe Image


The QL40-IP Induced Polarization probe combines a quadruple spacing normal resistivity tool and dual spaced induced polarization tool to measure the electrical resistivity, spontaneous potential and chargeability of rocks. A high chargeability response is an indication of the presence of metallic sulphides and oxides or cation-rich clays.

The QL40-IP is stackable within the QL (Quick Link) product line or it can be run as a standalone tool.


  • Detection of disseminated pyrite in sedimentary rocks
  • In uranium roll-front deposits, which sometimes show higher concentrations of pyrite
  • In coal seams to detect pyrite or other ferrous material
  • Detection of sulfides in igneous and metamorphic rocks
  • Identify montmorillonite clay in sedimentary depositional systems

Operating Conditions

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

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

[_] Required
[X] Not Necessary

Isolation Bridle
[X] Required
[_] Not Necessary

Features & Benefits

  • Real time recording and display of entire current injection and decay cycles (full waveform digitization of electrode voltage and injection current with downhole real time digital processing)
  • Four resistivity measurements are recorded compared to two offered by most other manufactures
  • Full measurement range and accuracy is achieved without the need for manual range switching
  • User defined injection current cycle timing (custom ‘On’ and ‘Off’ times for IP measurements)
  • Ultra slimline 43 mm OD and easy one-person operation

Specifications – Metric/English

Specification Metric Imperial
Diameter 43 mm 1.7″
Length 1.9 m 74.8″
Weight 9 Kg 19.8 lbs.
Max. Temp. 70ºC 158ºF
Max. Pressure 200 bar 2900 psi

IP Inversion-RTD Browser LoggerSuite

Sensor: Stainless steel electrode
Chargeability: Measured over 10 windows per spacing
IP Resolution: 1.2 µV
IP Input Impedance: 1.4 MOhm
Cycle Timing: User defined 100 to 4000 ms (1 ms resolution)

Resistivity Range: 0.1 to 100,000 Ohm-m
Resistivity Accuracy: 1% Full Scale
SPR Range: 0.1 to 100,000 Ohm
SP Range: ± 18 V
SP Accuracy: ± 2.5 mV
SP Resolution: 0.5 mV

QL Stack Possibilities

  • QL40IP + QL40GR (Gamma) + QL40MGS (Magnetic Susceptibility): Mining, Exploration
  • QL40IP + QL40GR (Gamma) + QL40OBI (Optical Televiewer) or QL40ABI (Acoustic Televiewer): Exploration, Bedding Planes, Fractures
  • QL40IP + QL40SGR (Spectral Gamma): Clay Typing, Detection of Sulfides
  • QL40IP + QL40GR (Gamma) +QL40FTC (Fluid Res, Temp): Hydrogeologist’s Tool, Groundwater exploration and assessment


QL40-IP Induced Polarization Probe Brochure
User Guide

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