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Trillium 360 Borehole
Summary
Our Trillium family now includes the best very broadband borehole seismometer on the market!
The Trillium 360 BH is the highest performing borehole seismometer available. The Trillium 360 BH meets GSN operational requirements and is ideal anytime you want better understanding of seismicity on a global scale.
The Trillium Borehole 360 offers:
- the lowest magnetic sensitivity of any broadband seismometer
- a fail-safe holelock release mechanism that prevents jamming to the casement during removal
- an extended low-frequency range useful out to beyond a 10,000-second time period
- a high-pressure, marine-grade connector
- self-correction over a tilt range of +/-5 degrees
- the ability to resolve below Peterson's new low-noise model (NLNM) down to a 300-second time period
- a wide dynamic range with a clip level of +/-18.2 mm/s up to 10 Hz and +/-0.17g > 10 Hz
Specifications
Specifications are subject to change without notice.
TECHNOLOGY |
|
| Topology | Symmetric triaxial |
| Feedback | Force balance with capacitive transducer |
| Leveling | Internal automated leveling ±5º |
| Leveling initiation | Control line or serial port command |
| Mass centering | Motorized re-centering automatically initiated during leveling sequence |
| Holelock | Motorized single jaw, non-jamming |
| Alignment | North line on top cap; optional alignment rod for downhole orientation |
PERFORMANCE |
|
| Self-noise | Below the NLNM from 300 s to 10Hz (see Performance tab) |
| Sensitivity | 1100 V-s/m ±0.5% precision |
| Dynamic tilt | Maximum tilt without auto-levelling ±0.025º |
| Bandwidth | -3 dB points at 373 s and 155 Hz |
| Clip level | 18.2 mm/s up to 10 Hz and 0.17 g above 10 Hz |
| Transfer function |
Lower corner poles within ±0.5% of nominal provided /
High-frequency response within ±1 dB of nominal up to 50 Hz |
| Temperature | ±10°C without recentering |
| Magnetic sensitivity | <0.03 (m/s2)/T |
INTERFACE |
|
| Velocity output |
40 V peak-to-peak
Selectable XYZ or UVW mode |
| Mass position output | Three independent voltage outputs |
| Calibration input |
Single voltage input for all channels, independent calibration enabled for each channel
Calibration in XYZ or UVW |
| Control lines | Mass Center, Calibration Enable, XYZ/UVW mode |
| Connector | 20-pin marine |
| Serial port |
RS-232 compatible serial IP (SLIP)
Onboard web server standard HTTP For enhanced instrument control and status: self-levelling and mass centering, UWV/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 |
| Protection |
Reverse-voltage protected
Auto-resettable over-current protection (No fuse to replace) |
| Power consumption |
800mW typical at 15V input
1.5A to operate holelock |
PHYSICAL |
|
| Case design | Stainless steel pressure vessel and holelock |
| Diameter | 146 mm (5.75"), including external magnetic shield |
| Height | 886 mm (34.9") not including connector or actuator guard pipe |
| Weight | 30 kg |
| Parasitic resonances | None below 100 Hz |
| Handling |
Eye bolt on lid for lifting cable
1300lbf (5800N) rated |
ENVIRONMENTAL |
|
| Operating temperature | -20ºC to 60ºC (ultra-low temperature option available, please contact Nanometrics) |
| Storage temperature | -40ºC to 70ºC |
| Shock |
20 g half sine, 5 ms without damage, 6 axes
No mass lock required for transport |
| Water immersion | Rated to IP68 and NEMA6P for continous submersion |
Performance
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