The Trillium Borehole Seismometer is a very broadband seismometer designed for cased borehole deployments. The instrument is housed in a stainless steel enclosure incorporating a hole-lock mechanism to allow the instrument to be coupled to a deep borehole casing. Instrument recovery is aided by a fail-safe holelock release mechanism that prevents jamming to the casement during removal.
An advanced leveling system allows the unit to operate over a tilt range of +/-5 degrees. The axis stack is mechanically levelled to ensure that the vertical axis does not couple horizontal noise.
The Trillium Borehole is ideal for local, regional and tele-seismic studies having a response flat to velocity from 120 seconds to 150 Hz and a self noise below the NLNM at 100 seconds. Operators will appreciate the low power consumption, automatic mass centering and robust no-mass lock design inherent in all Trillium seismometers.
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An advanced leveling system allows the unit to operate over a tilt range of +/-5 degrees. The axis stack is mechanically levelled to ensure that the vertical axis does not couple horizontal noise.
The Trillium Borehole is ideal for local, regional and tele-seismic studies having a response flat to velocity from 120 seconds to 150 Hz and a self noise below the NLNM at 100 seconds. Operators will appreciate the low power consumption, automatic mass centering and robust no-mass lock design inherent in all Trillium seismometers.
- Automatic leveling for corrections of up to +/- 5 degrees, to facilitate installations in deep boreholes
- A robust, waterproof, stainless steel enclosure ensures the sensor is protected from hostile environments
- The down hole design includes a 5.6 inch diameter casing, single marine grade connector and a centered attachment eye bolt on the top surface
- Low power consumption of 560mw minimizes power source requirements at the site
- Exceptional self noise below NLNM at 100 seconds is well suited for quiet borehole installations
TECHNOLOGY | |
| Topology | Symmetric triaxial |
| Feedback | Force balance with capacitive transducer |
| Levelling | Automatic motorized mechanical |
| Hole Lock | Motorized single-jaw, non-jamming |
| Alignment | From the surface |
PERFORMANCE | |
| Self-noise | Below the NLNM at 100 Seconds |
| Sensitivity | 1200 V-s/m ±0.5% precision |
| Bandwidth | -3 dB points at 120s and 150 Hz |
| Clip Level | > 16.6 mm/s up to 10 Hz and 0.17g above 10 Hz |
| Temperature | ±45°C without re-centering |
INTERFACE | |
| Connector | 20-pin marine |
| Velocity Output | 40 V peak-to-peak differential; Selectable XYZ or UVW mode |
| Mass Position Output | Three independent voltage outputs |
| Calibration Input | Single voltage input for all channels, independant calibration enable for each channel
Calibration in XYZ or UVW |
| Serial Port | RS-232 compatible serial IP (SLIP)
Onboard web server standard HTTP For enhanced instrument control and status: Self-levelling and mass centering, UVW/XYZ mode, short/long period mode, firmware updates, temperature, mass position, instrument status, serial number and factory info |
POWER | |
| Supply Voltage | 9 to 36 volts DC isolated input |
| Power Consumption | 560 mW typical at 15 V input after holelock is engaged |
| Protection | Reverse-voltage protection; Auto-resettable over-current protection
(No fuse to replace) |
PHYSICAL | |
| Diameter | 143 mm (5.6") Cylinder and clamping studs |
| Height | 886 mm (35.4") not including connector and actuator guard pipe |
| Weight | 30 Kg |
| Handling | Eye Bolt on lid for lifting cable, 1300lbf (5800 N) rated |
ENVIRONMENTAL | |
| Operating temp | -40°C to +55°C |
| Humidity | 0 to 100% |
| Shock | 20g half sine, 5 ms without damage, 6 axis;
No mass lock required for transport |
| Rugged | Rated to IP68 and NEMA6P for prolonged submersion |
Specifications subject to change without notice