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.
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 |