The QL40-OCEAN Idronaut Ocean Seven 303 probe combines a multi-parameter sensing unit manufactured by Idronaut srl, Brugherio, ITALY. This water quality probe is specifically designed for groundwater and environmental investigations. It uses reliable, accurate and drift-free high quality sensors and records a continuous profile of the borehole fluid properties.

In the standard configuration, the QL40-OCEAN probe is equipped with six sensors to measure: Pressure, Temperature, Conductivity, Dissolved Oxygen, pH and Oxidation reduction (REDOX) potential.

In operation, the user can define the conductivity range for fresh or sea water environment and configure the tool processor for computing properties as: Conductivity corrected at 20°C and at 25°C, Fluid density, Salinity, Speed of sound, and O2 saturation in ppm. The QL40-OCEAN can be combined with other logging tools of the QL (Quick Link) product line or can be operated as a standalone tool.


  • Groundwater Properties
  • Borehole contamination studies
  • Advanced hydrochemical analysis
  • Salt-water intrusion studies
  • Localization of water intervals of different quality
  • Water-well monitoring

Operating Conditions

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

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

[_] Required
[X] Non-Necessary

Features & Benefits

  • The only water quality tool of its kind that can collect detailed data at high pressures and temperatures.
  • Sensors can be used in a wide range of water types
  • Measurements are accurate and consistent.
  • Operates on any standard wireline (mono, 4 or 7 conductor, coax)
  • Slim, 40 mm diameter. One-person operation.

Specifications – Metric/English

Specification Metric Imperial
Diameter 40 mm 1.57″
Length 1.41 m 55.5″
Weight 5.45 Kg 12 lbs.
Max. Temp. 50ºC 122ºF
Max. Pressure 150 bar 2175 psi


QL Stack Possibilities

  • QL40OCEAN + QL40GR (Gamma): Water-well Monitoring, Contaminant Intrusion Studies
  • QL40OCEAN + QL40GR (Gamma) + QL40DEV (Deviation): Identification of Aquifers correlated with well path.
  • QL40OCEAN + QL40GR (Gamma) + QL40ELOG (Resistivity): Hydrogeologist’s Tool, Groundwater exploration, assessment, and well completion


Data Sheet
User Guide
Idronaut User Guide

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