Broadband Seismometer for Ocean-Bottom Applications Models 4011OBS and 4111OBS
Seismometers 4011OBS and 4111OBS are specially adapted for ocean bottom applications versions of models 4011 and 4111 correspondingly. These models share main technical parameters with corresponding regular versions but have a specially designed compact, lightweight case, flat flexible signal cable and consume less power. Specially designed hardware allow the seismometer to be installed inside titanium or glass spheres, usually used in ocean bottom installation. The instrument is fully operable at up 15° tilt angle and thus does not require accurate leveling. |
TECHNICAL SPECIFICATIONS
Transducer Type |
Molecular Electronic Transfer |
|---|---|
Sensitivity |
2000 V/m/sec - differential output |
Clip level |
± 10 mm/s |
Standard Bandwith |
30 s – 20 Hz for 4011OBS and 60 s – 20 Hz for 4111 OBS |
Self Noise |
See Graph Below. |
Dynamic range |
122 dB |
Mass Lock |
NOT REQUIRED |
Mass Centering |
NOT REQUIRED |
Maximum Installation Tilt |
±15 ° |
Mechanical Resonances |
NONE |
Power Supply |
6 mA at 7.5 - 15 Vdc stabilized or battery power source |
Housing Material |
Stainless steel |
Case Diameter/Height |
160/140 mm |
Weight |
3.0 kg |
Operating temperature range |
-12 to + 55 °C |
CME-4011OBS and CME-4111OBS noise levels vs. USGS Low Noise Models
