Trillium Cascadia

Cascadia logo

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 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


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


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


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")

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

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