Mini CH4

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

Mini CH4

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


  • 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

Mini CH4 Submersible pCH4 Sensor

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.


Sensor Performance
pCH4 Measurement Ranges 0-1% 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 Pressure 0-2 bar
Accuracy: pCH4 ± 3% of max range
TDGP ± 1%
Equilibration rate (t63) ~8 minutes (with water-pumped head)
Resolution 0.1% of max range
Length 28 cm (11 in)
Diameter 5.3 cm (2.1 in)
Weight Air 0.53 kg (1.2 lbs)
Water: -0.06 kg (-0.1 lbs)
Housing Material Acetal Plastic / Titanium
Depth Rating 0 - 600 m (Plastic)
Up to 6000 m (Titanium)
Water Temperature 0º to 35º C
Input voltage digital: 7-24 VDC
analog: 12-24 VDC
Power consumption 0.45W (35 mA @ 12 V)
Data output digital: RS-232, ASCII format
analog: 0-5 V or 4-20 mA
Sample rate 2 seconds (variable rate with logger/controller)


Pigtail Cables with Locking Sleeves
5, 10, 25, 50 meters, or longer

Water-Pumped Head
Reduce biofouling and improve response rate

External Battery Pack
19, 76 or 134 Amp-hour capacity

Titanium Housings
Rated up to 6000 m depth

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