Trillium 120 Posthole Broadband Seismometer

The Trillium 120PH Posthole 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 leveling system allows the unit to operate over a tilt range of +/-10 degrees. The Trillium 120PH is ideal for local, regional and tele-seismic studies having a response flat to velocity from 120 seconds to 145 Hz and a self noise below the NLNM from 35 seconds to 10 Hz. Operators will appreciate the low power consumption, remote mass centering and robust no-mass lock design inherent in all Trillium seismometers.

  • Automatic motorized mass centering can be remotely initiated to correct leveling of up to +/- 10 degrees, simplifying down-hole installations
  • A robust, waterproof, stainless steel enclosure ensures the sensor is protected from hostile environments
  • The down-hole design includes a 6.8 inch diameter casing, single marine grade connector and a centered attachment eye bolt on the top surface
  • Low power consumption of 620mw minimizes power source requirements at the site
  • Exceptional self noise below NLNM 35s to 10 Hz is well suited for quiet down-hole installations

 

TECHNOLOGY

  
Topology Symmetric triaxial
Feedback Force balance with capacitive transducer
Mass Centering Automatic motorized re-centering, can be remotely initiated
   
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 35 s up to 10 Hz
Sensitivity 1200 V-s/m ±0.5% precision, Contact factory for other options
Bandwidth -3 dB points at 120s and 145 Hz
Clip Level > 15 mm/s up to 1.5 Hz

Temperature

±45°C without re-centering 

INTERFACE

  
Connector 19-pin MIL-C-28642
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 620 mW typical at 15 V input
Protection
Reverse-voltage protection; Auto-resettable over-current protection 
(No fuse to replace)

PHYSICAL

  
Diameter 17.0 cm
Height 432 mm, not including connector
Weight 7.5 Kg
Handling Detachable carrying handle on lid

ENVIRONMENTAL

  
Operating temp -20°C to +50°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
 

 

Preliminary specifications. Subject to change without notice.