Methane sensors (Franatech)

These sensors have a semi-conductor with an active layer that absorbs methane. A change in conductivity of the active layer is proportional to the amount of dissolved methane in seawater.

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Fig. 72.    A Franatech methane sensor
Parameter Value

Range

50nM to 10μM

Sensitivity

1nM to 500nM (pumped flow-through mode)

Low range

20nM – 1μM

High range

1μM – 40μM

Response time

several seconds

Depth rating

4000m