Trillium Compact All-Terrain

• Summary
  The Trillium Compact All-terrain Seismometer is an ultra-low power broadband seismometer specifically developed for deployments where long-term site stability is questionable, or where the ability to prepare a sensor footing is limited, such as volcanoes, ice fields, and glaciers. Incorporating a robust and reliable leveling gimbal that operates over a full 360° range, the Compact All-terrain will auto-level from all orientations ensuring continuous operation even in a constantly changing environment. The All-terrain seismometer features the performance of the Trillium Compact seismometer, including its exceptional dynamic range and low noise floor.
  
• Benefits
  • The precise, kinematic 360° gimbal auto-levels from any orientation to provide successful deployment and continuous operation on hostile or unstable surface terrain without intervention through site visits
  • SOH outputs include case orientation, providing a powerful data set for reviewing deployment history
  • A robust, stainless steel enclosure ensures the sensor is protected from the most hostile environments
  • Ultra-low power consumption of 180mw reduces battery costs and minimizes power source requirements at the site
  • Exceptionally high clip level of 26 mm/s permits on scale recording of larger events closer to the source
• Specifications

  TECHNOLOGY

  Topology	Symmetric triaxial
  Feedback	Force balance with capacitive transducer
  Mass Centering	Not required

  PERFORMANCE

  Self-noise	See graph
  Sensitivity	750 V•s/m nominal ±0.5% precision
  Off-axis Sensitivity	±0.5 %
  Bandwidth	-3dB points at 120 s and 100 Hz
  Transfer Function	Lower corner poles within ±0.5% of nominal provided High-frequency response within 1dB of nominal
  Clip Level	No peak in response at high frequency
  Parasitic Resonances	26 mm/s from 0.1 Hz to 10 Hz
  Operational Tilt Range	None below 100 Hz ±2.5° without re-leveling

  LEVELING AND ORIENTATION

  Technology	Dual degree-of-freedom motorized gimbals Jam-free mechanism Kinematic design preserves full seismometer
  Clamping	performance
  Range	Active, sequenced by gimbals processor
  Accuracy	>±180° relative to upright case
  Leveling Initiation	Levels to within ±0.5° of true vertical Some or all of: • Configurable delay after power on • Configurable periodic • Automatic as-required, based on mass positions • External Command

  DIGITAL INTERFACE

  Type	RS-232 compatible Serial Line Internet Protocol (SLIP)
  Leveling	On board Web Server, standard HTTP Initiate immediate leveling via user interface Automatic leveling mode (post power-on, periodic, as-needed)

  DATA OUTPUTS

  On Request	Independent mass position values Instrument temperature SOH Magnetometer readings Case orientation (with respect to vertical) Seismometer orientation (with respect to vertical) Download state-of-health (SOH) log Erase SOH log Download custom information Factory sensitivity and sensor response data User calibration data (poles and zeros) Instrument serial number and firmware revision
  Leveling Log	Every leveling event is logged in non-volatile memory Full before-and-after state-of-health is logged
  State-of-Health Log	Scheduled interval logging of SOH, including: • Time from power-on • Seismometer mass positions • Vessel and seismometer orientations • Magnetometer readings • Temperature Internal relative humidity Capacity for more >2 years of twice daily level checks and SOH logging

  PHYSICAL

  Enclosure	Stainless Steel cylinder Connector on top end cap
  Diameter	151 mm
  Height	258 mm, not including connectors
  Weight	14.5 kg on land

  CONNECTORS

  Main Connector

  12-pin female, VSK-12-BCL rubber-molded glass epoxy 40V peak-to-peak differential seismic signal plus ground (3 channels) Serial RS-232 port (Rx, Tx, GND) Calibration voltage input Power input and return

  POWER

  Supply Voltage	9 to 29 VDC isolated
  Power Consumption	<180 mW typical (leveled, quiescent)
  Protection	Reverse-voltage and over-voltage protected Self-resetting over-current protection Unit can be powered on during installation and retrieval

  ENVIRONMENTAL

  Operating Temperature	-20ºC to +60ºC
  Storage Temperature	-40ºC to +70ºC
  Shock	100g half sine, 5 ms without damage, 6 axes
  Transportation	No seismometer mass lock required prior to deployment and through full experiment cycle
  Magnetic	Insensitive to natural variations of the Earth’s magnetic field

  
  

  Specifications subject to change without notice

• Performances