Trillium Cascadia


The Trillium Cascadia is the result of marrying the world's best class A accelerometer with the world's most popular seismometer. This dual-use, ultra-wide dynamic range sensor measures both strong motion and weak motion, with absolutely no compromise in performance. And with one hole to dig, a single connector, a single cable and sensors that are guaranteed to be mutually aligned to north, proper deployment is virtually effortless.

Why Trillium Cascadia?

  • Highly portable, easy to install, no vault required
  • Will never go off scale
  • Ideally suited for applications where the amplitude range is unpredictable
  • Suitable for harsh environments, resistant to flooding
  • Minimal site footprint
  • Each sensor independently serviceable
  • Low cost of deployment/low cost of ownership
  • Maximizes scientific return on investment

Specifications are subject to change without notice.

Topology Symmetric triaxial
Feedback Force balance with capacitive displacement transducer
Mass centering Not required
Sensitivity 754.3 V*s/m nominal ±0.5% precision
Off-axis sensitivity ±0.5%
Bandwidth -3 dB points at 120.2 s and 108 Hz
Transfer function Lower corner poles within ±0.5% of nominal provided
High frequency response within 1 dB of nominal up to 45 Hz

No peak in response at high frequency

Clip level 26 mm/s from 0.1 Hz to 10 Hz
Dynamic range > 152 dB @ 1 Hz
Tilt Dynamic and operational tilt range of ±2.5º
Parasitic resonances None below 200 Hz
Topology Triaxial, horizontal-vertical
Feedback Force balance with capacitive displacement transducer
Centering Automated electronic offset zeroing via user interface
Full-scale range Electronically selectable
Independent vertical and horizontal configuration
Bandwidth (-3 dB) DC to 430 Hz
Dynamic range 166 dB @ 1 Hz over 1 Hz bandwidth
155 dB, 3 to 30 Hz
Offset Electronically zeroed to within ±0.005 g
Offset trimming range ±0.05 g
Non-linearity < 0.015% total non-linearity
Hysteresis Less than 0.005% of full scale
Cross-axis sensitivity Less than 0.5% total
Offset temperature coefficient Horizontal sensor: 60 µg/ºC, typical
Vertical sensor: 320 µg/ºC, typical
Connector 26-pin connector
Glenair 802-013-02Z110-26E
Calibration input Single voltage input and one active-high control signal to enable all three channels
Independent  channel selection by serial port
Seismometer module velocity output 40 Vpp differential
Selectable XYZ (east, north, vertical) or UVW mode
Seismometer module mass position output Single voltage output representing maximum mass position
Three-channel mass positions available through serial port
Acclerometer module acceleration output 40 Vpp differential
Acclerometer module control input Single control signal can be configured to initiate auto-zero, initiate self-test or enable calibration
Accelerometer module status output Asserted: Unit OK, output signal valid

Deasserted: Self-test in progress or failed, auto-zeroing in progress, calibration enabled, or starting up

Digital interface RS-232 compatible serial-over-IP (SLIP)
Onboard web server standard HTTP
Seismometer module digital commands XYZ/UVW mode switching, calibration channel selection (off, enable all, U, V, or W), short period/long period mode switching, firmware updates, state-of-health request, upload user calibration data
Seismometer module digital data outputs Independent mass position values, instrument temperature, factory sensitivity and sensor response data, user calibration data (poles and zeroes), instrument serial number and firmware revision, virtual bubble level display for levelling
Accelerometer module digital commands Gain range selection, auto-zero (or set to specific offset), self-test, calibration enable, state-of-health request, firmware updates
Accelermoeter module digital data outputs Sampled XYZ outputs (in volts and g), instrument temperature, trimmer settings, instrument serial number, hardware assemblies and firmware revisions
Supply voltage 9 to 36 V DC isolated inputs
Power consumption Seismometer module: 180 mW typical quiescent
Accelerometer module: 1.1 W typical quiescent
Protection Reverse-voltage and over-voltage protected
Self-resetting over-current protection
Isolation Supply power is isolated from signal ground
Diameter 96.4 mm (3.79")
Height 215.9 mm (8.5") overall height of unit
230.8 mm (9.08") unit with connector
237.8 mm (9.37") unit with connector and feet
Housing Stainless steel
Operating temperature -20°C to 60°C
Storage temperature -40°C to 70°C
Shock 100 g half sine, 5 ms without damage, 6 axes
No mass lock required for transport
Magnetic sensitivity Insensitive to natural variations of the earth's magnetic field
Water immersion Rated to IP68 for prolonged submersion
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