The Trillium Posthole (PH) Seismometer is a very broadband seismometer designed for down-hole deployments. The instrument is housed in a stainless steel enclosure incorporating a high-pressure marine grade connector making it ideally suited to uncased, buried installations.
An advanced, internal leveling system allows the unit to operate over a tilt range of +/-5 degrees (+/-10 degrees is also an option). The axis stack is mechanically leveled to ensure that the vertical axis does not couple horizontal noise. The Trillium PH 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, remote mass centering and robust no-mass lock design inherent in all Trillium seismometers.
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An advanced, internal leveling system allows the unit to operate over a tilt range of +/-5 degrees (+/-10 degrees is also an option). The axis stack is mechanically leveled to ensure that the vertical axis does not couple horizontal noise. The Trillium PH 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, remote mass centering and robust no-mass lock design inherent in all Trillium seismometers.
- Automatic leveling can be remotely initiated to correct leveling of up to +/- 5 degrees (+/-10 degrees is also an option), simplifying down-hole installations
- The axis stack is mechanically leveled to ensure that the vertical axis does not couple horizontal noise
- 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 down-hole installations
TECHNOLOGY | |
| Topology | Symmetric triaxial |
| Feedback | Force balance with capacitive transducer |
| Levelling | Automatic motorized mechanical |
| Alignment | Vertical scribe marks for (N and S); Precision guide in cover for straight-edge, line or laser level; Holes for 5/16" alignment (E and W) |
PERFORMANCE | |
| Self-noise | Below the NLNM at 100 seconds |
| Sensitivity | 1200 V-s/m ±0.5% precision, Contact factory for other options |
| Bandwidth | -3 dB points at 120s and 145 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
Calibration in XYZ or UVW |
| Serial Port | For enhanced instrument control and status:
Mass center, UVW/XYZ mode, short/long period mode, firmware updates Temperature, mass position, instrument status, serial number |
POWER | |
| Supply Voltage | 9 to 36 volts DC isolated input |
| Power Consumption | 560 mW typical at 15 V input |
| Protection | Reverse-voltage protection; Auto-resettable over-current protection
(No fuse to replace) |
PHYSICAL | |
| Diameter | 143 mm |
| Height | 430 mm, not including connector |
| Weight | 16 Kg |
| Handling | Detachable carrying handle on lid |
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 outdoor use |
Specifications subject to change without notice