Water Quality Probe

QL40 OCEAN 303

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.

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


Idronaut ocean seven 303, Pressure, Temp, Fluid Conductivity, Oxygen, PH, Redox

Temperature – Pressure

0-50°C (32-122°F)
150 bar (2175 psi)

Diameter – Length

40 mm (1.57”) – 1.41 m (55.5”)


5.45 kg (12 lbs)


Pressure : in dbar

Temperature : in °C

– Salt water : in mS/cm
– Fresh water : in μS/cm

Oxygen : in ppm.


Redox : in mV


Manufactured by Geotomographie GmbH

Technical Details

Generated wave types: SV
Signal frequencies: Up to 500 Hz (depending on geology and borehole distance)
Operational depth: Up to 100 m
Source length: 1015 mm
Source weight: 6 kg
Cable weight per metre: 377 g
Borehole diameter: 75-100 mm (or larger if spacers are used)
Clamping system: Infatable bladder
Depth indicator: Cable marking every 2 m
Connector: To impulse generator IPG800 or IPG5000
Storage: On drum
Switch box: Switch between two vertical shot directions

If you have a question OR REQUIRE A QUOTE, CONTACT us and one of our professional team members will assist you