Franatech GmbH

- Hydrogen Sensor



Provided in the same housing and with the I/O as the METS. Scientist Ko-ichi Nakamura from AIST, Japan reports from the firest field deployment: 'your H2 sensorworked fine during the YK03-09 cruise at hydrothermal sites in the Marianas in November 2003, i.e., reasonable sensitivity and response'. Currrent specifications offer a detection range of 4 to 100 nmol/l to a working depth of 3500m.


  • Material (housing and connector): Stainless steel
  • Weight in air: 1,3 kg
  • Connector (manufacturer: SubconnTM): MCBH8M-SS
  • Depth standard 2000m, optional 3500m.


  • Material (housing and connector): Titanium
  • Weight in air: 0,8 kg
  • Connector (manufacturer: SubconnTM): MCBH8M-Ti

Depth rating 4000m

A hydrogen sensitive detector is located in a detector room in the sensor head. The detector room is protected against water and pressure by a silicone membrane. The gas molecules diffuse through the membrane, following the partial pressure gradient between water and detector room, according to the Law of Henry. Hence, the concentration the detector room is directly correlated to the concentration in the outside water. The correlation is expressed by the calibration formula.

The Hydrogen sensor bases on the same detection technology as the classic Methane sensor.

Inherent to the technology, and also dependent on detector manufacturing and tuning, all parameters such as sensitivity, power consumption, response time and response behavior are linked together. The following specifications are indicative, we can select and tune the detector to meet your requirements.

Response time: reaction time within a few seconds, T90 between 5 and 30 min depending on ­deployment conditions.



  • Digital: RS485
  • Analog: 0..5 V
  • Format Calibration formula: Franatech, universal
  • Note: Digital and analog outputs in parallel


  • Digital: Integral RS232, RS485/RS232 desktop converter
  • Analog: 4..20 mA
  • Format Calibration formula: Seabird SBE-probe SST CTD-probe Integrated (plug & play)
  • Note: With integrated formula no raw data available

Concentration Range typical 4 to 100 nanomol/l Temperature range standard 2-20°C, optional 10-30°C.

  • Power supply: generally 9..36 VDC
  • Consumption: 100 mA@ 12VDC

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