The CME-4211-OBS and CME-4311-OBS seismometers are specially adapted for ocean bottom applications and are versions of the CME-4211 and CME-4311 models correspondingly.
These models share main technical parameters with corresponding regular versions but have a specially designed compact lightweight case, a flat flexible signal cable and consume less power. Specially designed hardware allows the seismometers to be installed inside titanium or glass waterproof spheres usually used in ocean bottom installations.
Characteristics Delivery and warranty
|Frequency range||0.016 Hz (60 sec) - 50 Hz|
|Self noise at 1 Hz||2.8 nm/sec (5.6 µV)|
|Sensitivity axes||Vertical, North, East|
|Supply voltage||12 V Nominal (10.5-16 V permissible)|
|Power consumption||8 mA|
|Maximum installation tilt||±15°|
|Dimensions||162 x 115 mm (diameter x height)|
|Case material||Stainless steel, aluminum|
|Max. underwater depth||determined by the external housing|
|Cross-axes sensitivity||-60 dB|
|Cold-start time||15 - 30 min|