Pro-Oceanus: Mini CH4 Submersible pCH4 Sensor

Rugged dissolved methane probe for ocean pipeline leak detection, groundwater, and industrial use.

The Mini CH4 instrument uses infrared detection to measure the partial pressure of CH4 gas dissolved in liquids. Conversion to dissolved methane concentration is simple with known temperature and salinity values.

Mini CH4 submersible instruments are compact, lightweight, plug and play sensors designed to measure pCH4 for a range of applications. The instrument also measures total dissolved gas pressure (TDGP), a useful parameter for many applications and data correction.

With housing options rated to 6000 dbar of hydrostatic pressure and resistance to most corrosive liquids, the Mini CH4 can provide reliable dissolved methane data for many applications. Flow-through and inline adapters are also available for simple industrial solutions.

For specialized applications, Pro-Oceanus can provide custom products to suit any need.


  • – Compact size
  • -Low power consumption
  • – Easy integration
  • – Multiple data output formats available
  • – Large selection of concentration ranges
  • – Optional internal or external battery power
  • – Digital option comes with internal data logger and controller with 2GB flash memory

pCH4 Sensor Applications

  • – Determining background levels of dissolved methane prior to hydrofracturing
  • – Groundwater and wellwater monitoring
  • – Offshore oiI and gas leak detection
  • – Wastewater greenhouse gas emissions
  • – Landfill leachate methane monitoring
  • – Greenhouse gas emissions from dam reservoir water supplies
  • – Methane hydrate studies
  • – Measurement of pCH4 in fermentation bioreactors


Sensor Performance
pCH4 Measurement Ranges0-1% CH4 ; by volume (~0-300 μg/L; by mass)
0-10%v/v (~0-3 mg/L)
0-100%v/v (~0-30 mg/L)
Total Dissolved Gas Pressure0-2000 mbar
Accuracy: pCH4± 2% of max range
TDGP± 0.1%
Equilibration rate (t63)8 minutes (with water-pumped head)
Resolution0.1% of max range
Length28 cm (11 in)
Diameter5.3 cm (2.1 in)
WeightAir 0.53 kg (2.2 lbs)
Water: -0.06 kg (-0.1 lbs)
Housing MaterialAcetal Plastic / Titanium
Depth Rating0 – 600 m (Plastic)
Up to 0 – 6000 m (Titanium)
Water Temperature-2º to 40º C
Input voltagedigital: 6-24 VDC
analog: 12-24 VDC
Power consumption0.45 W (35 mA @ 12 V)
Data outputdigital: RS-232, ASCII format
analog: 0-5 V or 4-20 mA
Sample rate2 seconds (variable rate with logger/controller)

Telemetry2U Compatible

Telemetry2U lets you monitor your sensors, control devices and automate tasks – all through one simple, secure, and configurable IoT platform. Pro-Oceanus products are compatible with their technology, allowing for:

  • – Real-time data access on any device
  • – Alerts and alarms for parameters you define
  • –  Comprehensive reporting and historic data visualizations available on customizable dashboards

Servicing, Calibration and Support

Imbros’ local engineering department can service, repair and calibrate your instrument without expensive shipping costs or wait times.


More information from Pro-Oceanus Download Datasheet

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