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.

QL40-OCEAN Water Quality Probe Image

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 flows in open/cased holes
  • Borehole contamination studies
  • Advanced hydrochemical analysis
  • Salt-water intrusion studies
  • Location of water intervals of different quality
  • Water-well monitoring
  • Geothermal gradient logging

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

Sensor Specifications

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


QL40-OCEAN Water Quality Brochure
User Guide
Idronaut User Guide

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